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Articles 31 - 60 of 61
Full-Text Articles in Physical Sciences and Mathematics
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Magnet Design For The Storage Ring Of Turkay, Zafer Nergi̇z
Turkish Journal of Physics
In synchrotron light sources the radiation is emitted from bending magnets and insertion devices (undulators, wigglers) placed on the storage ring by accelerating charged particles radially. The frequencies of produced radiation can range over the entire electromagnetic spectrum and have polarization characteristics. In synchrotron machines, the electron beam is forced to travel on a circular trajectory by the use of bending magnets. Quadrupole magnets are used to focus the beam. In this paper, we present the design studies for bending, quadrupole, and sextupole magnets for the storage ring of the Turkish synchrotron radiation source (TURKAY), which is in the design …
Monitoring Akkuyu Nuclear Reactor Using Antineutrino Flux Measurement, Sertaç Öztürk, Aytül Adigüzel, Veysi̇ Erkcan Özcan, Nafi̇z Gökhan Ünel
Monitoring Akkuyu Nuclear Reactor Using Antineutrino Flux Measurement, Sertaç Öztürk, Aytül Adigüzel, Veysi̇ Erkcan Özcan, Nafi̇z Gökhan Ünel
Turkish Journal of Physics
We present a simulation-based study for monitoring Akkuyu nuclear power plant's activity using antineutrino flux originating from the reactor core. A gadolinium-doped water Cherenkov detector was designed and optimization studies were performed using the Geant4 simulation toolkit. It was found that the bottom (or top) face of the target should be instrumented by six 10-inch-diameter photomultiplier tubes with photon detection efficiency of about 35% and the optimum Gd concentration was found to be about 0.3%-0.5%. The first study on the design of a monitoring detector facility for Akkuyu nuclear power plant is discussed in this paper.
Prompt Fission Neutron Energy Spectrum Of $^{252}Cf$ In Center Of Mass And Laboratory Systems, Mehmet Koçak, Humbat Ahmadov
Prompt Fission Neutron Energy Spectrum Of $^{252}Cf$ In Center Of Mass And Laboratory Systems, Mehmet Koçak, Humbat Ahmadov
Turkish Journal of Physics
In this work we discuss the influence of different forms of prompt fission neutron energy spectra in the fission fragment center of mass system on the laboratory spectrum of neutrons in spontaneous fission of $^{252}Cf$. We show that the Le Couteur spectrum, which takes into account multiple neutron emission of neutrons in the center of mass system, describes the observed neutron energy spectrum well when transformed to the laboratory system.
A Quartz Crystal Microbalance Study Of The Adsorption Of Benzene And Acetone Vapors Onto Coumarin-Substituted Manganese Phthalocyanine Film, Bi̇rsel Can Ömür, Ahmet Altindal
A Quartz Crystal Microbalance Study Of The Adsorption Of Benzene And Acetone Vapors Onto Coumarin-Substituted Manganese Phthalocyanine Film, Bi̇rsel Can Ömür, Ahmet Altindal
Turkish Journal of Physics
A novel coumarin-substituted manganese phthalocyanine (5) was successfully synthesized and used as sensing element for benzene and acetone vapor detection. The effects of water vapor on the benzene and acetone vapor-sensing properties and adsorption isotherms on thin film of 5 were also studied. Our preliminary results indicated that the presence of humidity modifies the baseline frequency but not the sensitivity of the sensor toward benzene and acetone vapors. Two isotherm models, Langmuir and Jovanovic isotherms, were selected to describe the adsorption process. Linear regression analysis, which is the most basic and commonly used predictive analysis method, was used to estimate …
Investigation Of Binary Co$_{2}$X (X = In, Si, Sb, Sn, Ga) Half-Heusler Alloys, Adewumi Isaac Popoola
Investigation Of Binary Co$_{2}$X (X = In, Si, Sb, Sn, Ga) Half-Heusler Alloys, Adewumi Isaac Popoola
Turkish Journal of Physics
The electronic structure and mechanical properties of some cobalt-based binary half-Heusler alloys Co$_{2}$X (X = In, Si, Sb, Sn, Ga) have been investigated using the density functional theory approach. The site preference by cobalt and X is similar to the traditional half-Heusler structure. The results showed that Co$_{2}$Si is not a half-metal but rather an n-type degenerate semiconductor. The compounds Co$_{2}$Ga, Co$_{2}$Sb, and Co$_{2}$Sn are thermodynamically unstable and Co$_{2}$In is elastically unstable. With much care given to the lattice size, half metallicity is readily predicted in Co$_{2}$In, Co$_{2}$Ga, Co$_{2}$Sn, and Co$_{2}$Sb. All the compounds showed directional bonding and they should …
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Effect Of Pu Content On Uncertainty In Reactor Parameters Due To Use Of No Temperature Gradient In (U-Pu)O$_{2}$ Fuels, Mehmet Türkmen
Turkish Journal of Physics
Radial temperature distribution in a fuel rod is a parabolic function. Neutronics calculations are in general performed over a volume-averaged temperature by ignoring this distribution. Such an assumption results in an uncertainty in reactor design parameters. In this study, the magnitude of this uncertainty is estimated by solving the heat equation with a temperature-dependent conductivity coefficient coupled with a reactor physics code. The effect of radial fuel temperature distribution is investigated by representing the fuel region as multiregional. Uncertainty is investigated for various Pu contents of (U-Pu)O$_{2}$ fuel, a mix of depleted U and reactor-grade Pu. The effect of Pu …
Lightest And Heaviest Two-Neutron Halo Nuclei, $^{6}$He And $^{22}$C, Waleed Hwash
Lightest And Heaviest Two-Neutron Halo Nuclei, $^{6}$He And $^{22}$C, Waleed Hwash
Turkish Journal of Physics
The microscopic cluster model approach has been performed to study the nuclear structure of the lightest and heaviest two-neutron halo nuclei, $^{6}$He and $^{22}$C, respectively. The matter radius and binding energy for the $^{6}$He and $^{22}$C nuclei are calculated and the effect of the core deformation ($^{20}$C) on the properties of $^{22}$C nuclei is also discussed. Calculations have shown that the microscopic cluster model provides a good description of binding energy as well as matter radius in comparison to experimental data. The fittings of some parameters such as central potential depth (V$_{o})$, empirical constant (r$_{o})$, and surface diffuseness value (a) …
Bound States Of The Duffin-Kemmer-Petiau Equation For Square Potential Well With Position-Dependent Mass, Zoulikha Hammoud, Lyazid Chetouani
Bound States Of The Duffin-Kemmer-Petiau Equation For Square Potential Well With Position-Dependent Mass, Zoulikha Hammoud, Lyazid Chetouani
Turkish Journal of Physics
The effective mass Duffin-Kemmer-Petiau equation for spin 0 and spin 1 with a potential well is considered, and transcendental equations are derived for the energy eigenvalues. Numerical results are reported graphically, and the variations of the energy of the bound states are computed as a function of the well width and mass.
Phenomenological Potential Calculations For Cluster Decays, Asim Soylu
Phenomenological Potential Calculations For Cluster Decays, Asim Soylu
Turkish Journal of Physics
The half-lives of cluster decays from various nuclei having experimentally measured values have been calculated by using the Wentzel-Kramers-Brillouin method together with the Bohr-Sommerfeld quantization condition for three different types of phenomenological nuclear interactions: Woods-Saxon (WS), squared Woods-Saxon (WS-2), and mixed Woods-Saxon (mWS) potentials. By comparing the results with experimental values, rms values have been calculated. The half-lives of $^{14}$C, $^{15}$N, $^{16}$O, $^{17}$O, $^{18}$O, $^{20}$O, $^{22}$O, $^{23}$F, $^{22}$Ne, $^{24}$Ne, $^{25}$Ne, $^{26}$Ne, $^{28}$Mg, $^{30}$Mg, and $^{34}$Si decays from various isotopes whose experimental half-lives are unknown have also been calculated by using the WS, WS-2, and mWS potentials. The obtained results have …
Bound-Free Pair Production With A Correction Term In Relativistic Heavy-Ion Collisions, Melek Yilmaz Şengül
Bound-Free Pair Production With A Correction Term In Relativistic Heavy-Ion Collisions, Melek Yilmaz Şengül
Turkish Journal of Physics
In our previous work, we calculated bound-free electron-positron pair production cross section without a correction term. In this work, bound-free electron-positron pair production with a correction term is considered to calculate the cross section for peripheral relativistic heavy ion collisions. The Dirac wave functions have been used for the leptons and first order corrections are included. It is seen that the results for the production cross sections are considerably smaller than those of the previous calculations. We applied the same method for the calculations of the antihydrogen production cross sections as well.
A Dft Study On The Electronic Structure Of Tungsten Trioxide Polymorphs, Masoud Mansouri, Tahereh Mahmoodi
A Dft Study On The Electronic Structure Of Tungsten Trioxide Polymorphs, Masoud Mansouri, Tahereh Mahmoodi
Turkish Journal of Physics
Tungsten trioxide ($WO_{3})$ is an intermediate product in the recovery of tungsten from its minerals. Recently, it has attracted increasing attention due to its exclusive structural properties and its high potential in electronic applications. The crystal lattice of tungsten trioxide is highly dependent on temperature. In this paper we investigated the equilibrium structure of tungsten trioxide in four crystal systems, i.e. monoclinic system, tetragonal system, orthorhombic system, and cubic system. We did our first principle calculations using a pseudopotential model based on the spin dependent density functional theory and implementing generalized gradient approximation for exchange correlation energy. In each case, …
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Linear Instability Of Dust Acoustic Waves In A Magnetized Gravitating Plasma In The Presence Of Dust Streaming, Himangshu Sahoo, Basudev Ghosh, Kalyan Kumar Mondal
Turkish Journal of Physics
Linear instability of dust acoustic waves (DAWs) has been theoretically studied in a collisionless gravitating dust-ion magnetized plasma including the effect of dust streaming. A linear dispersion relation has been derived by using the method of normal mode analysis. Gravitational effect is found to make the low-frequency DAW mode linearly unstable in certain parametric regions. The dependence of the growth rate of the instability on various plasma parameters such as streaming of dust particles, size of the dust grain, strength of the magnetic field, obliqueness of propagation, and number density of dust particles has been numerically analyzed and presented graphically.
Identification Of The Hadronic Interaction Layer In A Highly Granular Calorimeter By Multivariate Techniques, Burak Bi̇lki̇
Identification Of The Hadronic Interaction Layer In A Highly Granular Calorimeter By Multivariate Techniques, Burak Bi̇lki̇
Turkish Journal of Physics
Calorimetry in future and upgrade collider detectors has a clear overall trend towards high granularity, both laterally and longitudinally. This trend is a requirement for the full exploitation of particle flow algorithms, which reconstruct individual particles using the subdetector that provides the best resolution for this specific particle. The increased level of detail in the event topologies due to higher segmentation of the calorimeter provides additional handles for several calorimetric measurements, such as the identification of the hadronic interaction layer, which is not possible for calorimeters with traditional tower geometry. Here, the power of using multivariate statistical techniques in the …
Design Studies For The Beam Position Monitor (Bpm) Front-End Electronics Of The Turkish Accelerator And Radiation Laboratory In Ankara (Tarla), Ayhan Aydin, Ergün Kasap
Design Studies For The Beam Position Monitor (Bpm) Front-End Electronics Of The Turkish Accelerator And Radiation Laboratory In Ankara (Tarla), Ayhan Aydin, Ergün Kasap
Turkish Journal of Physics
A beam diagnostics system is vitally important to operate all accelerator-based facilities. The system provides information about beam characteristics and enables requested beam parameters to be achieved. The main parameters, such as beam energy, current, emittance, and beam position, must be diagnosed and controlled during the operation of an accelerator. Beam position monitors (BPMs) are an essential tool for diagnosing a system of accelerators. They are used to define the position of the beam traversing through the beam pipe at relativistic speed. These tools can be used to achieve the required beam quality as well as protecting the entire system …
Investigation Of Excitation Functions Of Proton-Induced Reactions On $^{94, 96, 98, 100}$Mo Targets For Production Of Radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc, Ozan Artun, Hüseyi̇n Ayteki̇n
Investigation Of Excitation Functions Of Proton-Induced Reactions On $^{94, 96, 98, 100}$Mo Targets For Production Of Radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc, Ozan Artun, Hüseyi̇n Ayteki̇n
Turkish Journal of Physics
In this work, we investigated the excitation functions of proton-induced reactions on even-even $^{94-100}$Mo isotopes for the production of medical radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc. To obtain the excitation functions we carried out cross-section calculations in the frameworks of the generalized superfluid model, microscopic level density model, and three options of the preequilibrium process in the Talys code. The aim of this study was to introduce a new aspect for the production of radioisotopes $^{94m, 94g, 96m, 96g, 96, 99m}$Tc with different models.
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Remarks On The Treatments Of Nonsolvable Potentials, Bülent Gönül, Yücel Cançeli̇k
Turkish Journal of Physics
A recently introduced scheme is extended to propose an algebraic nonperturbative approach for the analytical treatment of Schrödinger equations with nonsolvable potentials involving an exactly solvable potential form together with an additional potential term. As an illustration the procedure is successfully applied to the Cornell potential by means of very simple algebraic manipulations. However, instead of providing numerical eigenvalues for the only consideration of the small strength of the related linear potential as in the previous reports, the present model puts forward a clean route to interpret related experimental or precise numerical results involving a wide range of the linear …
Enhanced Electro-Optic Modulation Of Linbo$_{3}$-Based Photonic Crystal Cavities With Dual Mode And Polarization Operation, Fulya Bağci, Gökhan Kurt, Bariş Akaoğlu, Ekmel Özbay
Enhanced Electro-Optic Modulation Of Linbo$_{3}$-Based Photonic Crystal Cavities With Dual Mode And Polarization Operation, Fulya Bağci, Gökhan Kurt, Bariş Akaoğlu, Ekmel Özbay
Turkish Journal of Physics
A high output transmission and high quality factor, compact LiNbO$_{3}$-based Fabry-Perot-type photonic crystal cavity is reported that can be used in electro-optical modulators at optical communication wavelengths. The electro-optic effect is 123 times enhanced as compared to the bulk material as a result of the slow light effect. The transmission wavelength is found to depend linearly on the applied voltage with 1.2 nm/V modulation sensitivity. Moreover, an externally switchable dual mode regime with high quality factors and transmissions is realized. High transmissions and high quality factors are also obtained for both transverse-electric and transverse-magnetic polarizations simultaneously.
Achieving Carrier And Photon Confinement In Ga(Nasp)/Algap/Gap Qws On Si Substrates, Ömer Lütfi̇ Ünsal, Beşi̇re Gönül
Achieving Carrier And Photon Confinement In Ga(Nasp)/Algap/Gap Qws On Si Substrates, Ömer Lütfi̇ Ünsal, Beşi̇re Gönül
Turkish Journal of Physics
A detailed comparative theoretical analysis on both carrier and photon confinement of dilute nitride direct bandgap GaN$_{x}$As$_{1-x-y}$P$_{y}$ with that of GaAs$_{1-y}$P$_{y}$ on Si substrates is presented. Model calculations indicate that optical confinement factor of GaAs$_{1-y}$P$_{y}$/GaP is greater than that of GaN$_{x}$As$_{1-x-y}$P$_{y}$/GaP for all concentrations. We have demonstrated that one can improve the optical confinement factor of GaN$_{x}$As$_{1-x-y}$P$_{y}$/GaP by using an Al$_{z}$Ga$_{1-z}$P cladding layer.
Decomposition Of The Absorbed Dose By Let In Tissue-Equivalent Materials Within The Shield-Hit Transport Code, Nikolai Sobolevsky, Alexander Botvina, Ni̇hal Büyükçi̇zmeci̇, Ayşegül Kaya, Ludmila Latysheva, Riza Oğul
Decomposition Of The Absorbed Dose By Let In Tissue-Equivalent Materials Within The Shield-Hit Transport Code, Nikolai Sobolevsky, Alexander Botvina, Ni̇hal Büyükçi̇zmeci̇, Ayşegül Kaya, Ludmila Latysheva, Riza Oğul
Turkish Journal of Physics
The SHIELD-HIT transport code, in several versions, has been used for modeling the interaction of therapeutic beams of light nuclei with tissue-equivalent materials for a long time. All versions of the code include the useful option of decomposition of the absorbed dose by the linear energy transfer (LET), but this option has not been described and published to date. In this work the procedure of decomposition of the absorbed dose by LET is described and illustrated by using the decomposition of the Bragg curve in a water phantom, irradiated by beams of protons, alpha particles, and ions of lithium and …
Possible Variations In Sunspot Groups Before Flaring Activity During Solar Cycles 23 And 24, Ali̇ Kilçik, Seray Şahi̇n
Possible Variations In Sunspot Groups Before Flaring Activity During Solar Cycles 23 And 24, Ali̇ Kilçik, Seray Şahi̇n
Turkish Journal of Physics
We investigated the possible morphological variations observed in sunspot groups on the day before flaring activity occurred between January 1996 and November 2014. We found that 77% of all flaring sunspot groups were large and complex (D, E, and F modified Zurich classes). In addition, the Zurich classification of A, B, and C class sunspot groups changed more than 50%, while the remaining groups (D, E, F, and H) did not change considerably before the flare activity. Results showed that there was a remarkable increase in the sunspot areas of groups D, E, and F; in contrast, the sunspot areas …
Investigation Of A Novel Temperature-Sensing Mechanism Based On Strain-Induced Optical Path-Length Difference In A Multicore Optical Fiber, Belkis Gökbulut, Sema Güvenç, Mehmet Naci̇ İnci̇
Investigation Of A Novel Temperature-Sensing Mechanism Based On Strain-Induced Optical Path-Length Difference In A Multicore Optical Fiber, Belkis Gökbulut, Sema Güvenç, Mehmet Naci̇ İnci̇
Turkish Journal of Physics
A four-core optical fiber is employed to investigate a novel temperature-sensing mechanism, which is based on the strain-induced optical path-length difference between the fiber core pairs. A short segment of a four-core fiber is wound around a solid stainless steel cylinder to form a tight circular loop, which is exposed to temperatures of up to 100 $^{\circ}$C. Temperature-induced radial expansion of the stainless steel cylinder causes a shear strain in the fiber and introduces an optical path-length difference between the fiber core pairs. This results in a total phase shift of about 20.40 $\pm $ 0.29 rad in the interference …
On The Calculus Of Parameterized Fractal Curves, Alireza Khalili Golmankaneh
On The Calculus Of Parameterized Fractal Curves, Alireza Khalili Golmankaneh
Turkish Journal of Physics
In this paper, we apply $F^{\alpha}$-calculus on the fractal Koch and Ces\`{a}ro curves with different dimensions. A generalized Newton's second law on the fractal Koch and Ces\`{a}ro curves is given. Density of the moving particles absorbed on fractal Ces\`{a}ro are derived. Illustrative examples are given to present the details of $F^{\alpha}$-integrals and $F^{\alpha}$-derivatives.
Proton--Proton And Proton--Antiproton Differential Elastic Cross Sections Modeling At High And Ultra-High Energies Using A Hybrid Computing Paradigm, Elsayed Eldahshan
Proton--Proton And Proton--Antiproton Differential Elastic Cross Sections Modeling At High And Ultra-High Energies Using A Hybrid Computing Paradigm, Elsayed Eldahshan
Turkish Journal of Physics
This work presents a hybrid computing technique for modeling the differential elastic cross section of both proton--proton ``pp'' and proton--antiproton ``pp(bar)'' collisions from high to ultra-high energy regions (from 13.9 GeV to 14 TeV) as a function of the center-of-mass energy ``s'' squared and four momentum transfer squared ``t''. We proposed a genetic algorithm (GA) and support vector regression (SVR) hybrid techniques to calculate and predict the ``differential elastic cross section'' of both ``pp'' and ``pp(bar)''. Our proposed GA-SVR hybrid model shows a good match to the available experimental data, as well as predicting the latest and future ``TOTEM'' experiments …
Marder Type Universe With Bulk Viscous String Cosmological Model In $F(R,T)$ Gravity, Sezgi̇n Aygün
Marder Type Universe With Bulk Viscous String Cosmological Model In $F(R,T)$ Gravity, Sezgi̇n Aygün
Turkish Journal of Physics
In this study, we have investigated homogeneous and anisotropic Marder space-time with bulk viscous string matter distribution in $f(R,T)$ gravity. For this aim we have used the anisotropy feature $(\frac{\sigma_{x}^{x} }{\theta })$ of Marder space-time and a deceleration parameter in two different $f(R,T)$ models. We have obtained bulk viscous matter distribution solutions in $f(R,T)$ gravity. Finally, some kinematical and physical properties are discussed.
Deconvolution Analysis Of Thermoluminescent Glow Curves In Various Commercial Dosimeters Using Two Different Approaches In The Framework Of The One-Trap, One-Recombination Model, Eren Şahi̇ner
Turkish Journal of Physics
This paper reports kinetic analysis on the thermoluminescence (TL) glow peaks of various widespread luminescence dosimeters. A common general order kinetic (GOK) approximation and a relatively recently suggested Lambert W-function equation were used. The activation energies and the order of kinetic parameters are the main subjects of the present study. According to the results of this study, the activation energies of the main dosimetric peaks are estimated as 2.05 $\pm $ 0.11, eV, 1.23 $\pm $ 0.05 eV, and 1.11 $\pm $ 0.06 eV for LiF based dosimeters (TLD100, TLD600, TLD700), Al$_{2}$O$_{3}$:C (TLD500), and BeO dosimeters, respectively. Moreover, a number …
Optical Visible Wavelength Region Selective Reflector Design For Photovoltaic Cells Using Photonic Crystal, Veysel Korkmaz, Ali̇ Çeti̇n
Optical Visible Wavelength Region Selective Reflector Design For Photovoltaic Cells Using Photonic Crystal, Veysel Korkmaz, Ali̇ Çeti̇n
Turkish Journal of Physics
In this study, we have proposed an optical broadband angular reflector having a band selective feature and high reflectivity rate for photovoltaic implementations by using a photonic crystal structure made of two different dielectric layers. This paper presents new and useful information about a reflector that was designed by using a periodic structure composed of two Si based layers for the visible range in the solar spectrum region. The system has been adjusted in such a way that it could cover a wide wavelength area between the photonic band gaps at nearly λ ≈ 300-800 nm. We have tested the …
Temperature Measurements In A Manufactured Rf Plasma Jet In Various Ar/N$_{2}$ Mixtures, Mohammad Nasir Rostami Ravari, Alireza Ganjovi, Farideh Shojaei, Amir Falahat
Temperature Measurements In A Manufactured Rf Plasma Jet In Various Ar/N$_{2}$ Mixtures, Mohammad Nasir Rostami Ravari, Alireza Ganjovi, Farideh Shojaei, Amir Falahat
Turkish Journal of Physics
In this paper, using the optical emission spectroscopy technique, a comparative study is performed on the argon excitation and nitrogen vibrational temperatures in the plasma discharge medium of a manufactured RF plasma jet. The argon contribution in the Ar/N$_{2}$ mixture is varied from 70% to 98% and the obtained optical emission spectra from argon and molecular nitrogen are analyzed. The highest emission intensities of neutral argon (Ar I) are recorded in the wavelength range of 790-850 nm. It is seen that, at the higher argon percentages in the mixture, the emission intensity from all the formed species in the plasma …
Elastic Scattering Analysis Of $^{12}$C+$^{24}$Mg By Wkb Method, Orhan Bayrak
Elastic Scattering Analysis Of $^{12}$C+$^{24}$Mg By Wkb Method, Orhan Bayrak
Turkish Journal of Physics
We present the elastic scattering analysis of the $^{12}$C+$^{24}$Mg system by using the WKB approximation method within the framework of the barrier-internal wave decomposition over a wide range of energy from E$_{lab}$ = 16 MeV to 24.0 MeV. The results obtained are good agreement with the quantum mechanical (QM) calculation and experimental data.
Calculation Of The Frequency Shifts And Damping Constant For The Raman Modes (A$_{1g}$, B$_{1})$ Near The Tetragonal-Cubic Transition In Srtio$_{3}$, Ali̇ Ki̇raci, Hasan Hami̇t Yurtseven
Calculation Of The Frequency Shifts And Damping Constant For The Raman Modes (A$_{1g}$, B$_{1})$ Near The Tetragonal-Cubic Transition In Srtio$_{3}$, Ali̇ Ki̇raci, Hasan Hami̇t Yurtseven
Turkish Journal of Physics
Raman shifts of the soft mode A$_{1g}$ and the B$_{1}$ mode are calculated at various pressures at room temperature for the cubic-tetragonal transition (P$_{C}$ = 9.5 GPa) in SrTiO$_{3}$. This calculation is performed using the observed volume data through the mode Grüneisen parameters of A$_{1g}$ and B$_{1}$, which vary with pressure, by fitting to the experimental wavenumbers in this crystalline system. Calculated Raman shifts are then used as order parameters to predict the pressure dependence of the damping constant and the inverse relaxation time for the cubic-tetragonal transition in SrTiO$_{3}$. Our predictions from the pseudospin-phonon coupling and the energy fluctuation …
Synthesis Of Ni-Fe Thin Films By Electrochemical Deposition Technique And Characterization Of Their Microstructures And Surface Morphologies, Umut Saraç, Mali̇k Kaya, Mevlana Celaletti̇n Baykul
Synthesis Of Ni-Fe Thin Films By Electrochemical Deposition Technique And Characterization Of Their Microstructures And Surface Morphologies, Umut Saraç, Mali̇k Kaya, Mevlana Celaletti̇n Baykul
Turkish Journal of Physics
Microstructural features and surface morphologies of Ni-Fe thin films fabricated by the electrochemical deposition technique have been experimentally studied. Ni-Fe thin films have been deposited under different deposition potentials and FeSO$_{4}$ concentrations. Energy dispersive X-ray measurements demonstrate that the Fe content decreases (increases) as the deposition potential (FeSO$_{4}$ concentration) is enhanced. All of the produced films exhibit an anomalous codeposition behavior. The effects of deposition potential and FeSO$_{4}$ concentrations on the degree of anomalous codeposition have been also characterized. X-ray diffraction studies reveal that the films have face-centered cubic crystallographic structures with [111] preferred crystallographic orientation regardless of the applied …