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Articles 1 - 30 of 47
Full-Text Articles in Physical Sciences and Mathematics
Recombination Mechanisms In Hydrogenated Silicon Nanocrystalline Thin Films, Zaki M. Saleh, Salam M. Kmail, Samah F. Assaf, Atif F. Qasrawi
Recombination Mechanisms In Hydrogenated Silicon Nanocrystalline Thin Films, Zaki M. Saleh, Salam M. Kmail, Samah F. Assaf, Atif F. Qasrawi
Turkish Journal of Physics
The photoconductivity dependences on temperature and illumination intensity were investigated for thin films of hydrogenated nanocrystalline silicon (nc-Si:H) grown by very-high-frequency, plasma-enhanced chemical vapor deposition. The nanocrystalline phase was achieved by heavy hydrogen dilution of silane (SiH_4). We find that the activation energy of the photoconductivity is sensitive to the incident illumination intensity for illumination intensities below 6 mW/cm^2. The photocurrent follows a power-law dependence on illumination intensity (I_{ph}\propto F^{gamma}), with gamma ranging from 0.36 to 0.83. The illumination dependence of the photocurrent suggests 2 different recombination mechanisms depending on temperature. In the lower temperature regime (300-340 K), recombination appears …
Identification Of Spontaneous Fission Fragments By Using Thermally Annealed Padc Films, Abdallah F. Saad, Nama Abdelssadk Hamed, Yasin Kailani Abdalla
Identification Of Spontaneous Fission Fragments By Using Thermally Annealed Padc Films, Abdallah F. Saad, Nama Abdelssadk Hamed, Yasin Kailani Abdalla
Turkish Journal of Physics
One of main requirements in applied nuclear physics is the need of a detector capable of detecting and differentiating different particles. Thus, the fission products from a ^{252}Cf radioactive source, after about 12 half-life periods of alpha decay, are registered using virgin and annealed CR-39 polyallyldiglycol carbonate (PADC) films. In the case of virgin CR-39, a single peak appears corresponding to the heavy group of these products, while the other peak related to the light group is obscured. The annealed CR-39 detectors, on the other hand, were demonstrated to be highly sensitive to the fission fragments, and as a result …
Investigation Of Dominant States In The Collisions Of Ar Vii And Kr Xxiv With H_2 And He Targets, Abdel Aziz Habib, Alaa Abo Zalam, Hassan Ramadan
Investigation Of Dominant States In The Collisions Of Ar Vii And Kr Xxiv With H_2 And He Targets, Abdel Aziz Habib, Alaa Abo Zalam, Hassan Ramadan
Turkish Journal of Physics
In thermal plasma, the ion--atom collisions proceed most probably through resonance processes. One of the important processes is the resonant transfer excitation followed by emission of X-rays (RTEX), which causes self-cooling for plasma. In addition, it is identical to the dielectronic recombination (DR) in electron-ion collisions. The present work deals with the calculation of DR cross-sections (\sigma^{DR}s) and DR rate coefficients (\alpha^{DR}s) as well as RTEX cross-sections (\sigma^{RTEX}s) for Mg-like ions [Ar^{6+} and Kr^{24+}] with L-shell and K-shell excitation for \Deltan = 0 and \Delta n \neq 0. Comparison between the present results and other calculations for the rates are …
Defect Studies In Strain-Relaxed Si_{1-X}Ge_X Alloys, Şeref Kalem
Defect Studies In Strain-Relaxed Si_{1-X}Ge_X Alloys, Şeref Kalem
Turkish Journal of Physics
Raman light scattering, low-temperature photoluminescence, light-scattering tomography, and hydrogenation were used to investigate optical properties of defects in strain-relaxed Si_{1-x}Ge_x (0.05 \le x \le 0.50) alloys. The photoluminescence emission was characterized by typical zero-phonon, phonon-assisted, and dislocations-related emissions, which are dependent on Ge composition x. However, luminescence spectra exhibited above band-gap features, which are likely associated with the presence of Si-rich regions in the alloys. The results are correlated with light-scattering tomography, revealing the presence of dislocations and Si precipitates. The excess peak at 519 cm^{-1} in Ge-rich samples is supportive of this observation. At low Ge content, a dislocation-related …
Structure And Odd--Even Staggering Of Mo, Ru, And Pd Even--Even Nuclei In The Framework Of Ibm-1, Vidya Devi
Structure And Odd--Even Staggering Of Mo, Ru, And Pd Even--Even Nuclei In The Framework Of Ibm-1, Vidya Devi
Turkish Journal of Physics
In this study, we employed the interacting boson model (IBM-1) to determine the most appropriate Hamiltonian for the study of ^{94-108}Mo, ^{94-110}Ru, and ^{96-114}Pd isotopes in the region A cong 100. The soft rotor formula (SRF) calculation was also done to study these isotopes. Using the best fit values of parameters to construct the Hamiltonian of the IBM-1 we calculated energy levels and B(E2) values for number of transitions in Mo, Ru, and Pd nuclei. The results obtained from the IBM-1 and SRF were compared with experimental data and IBM-2 calculation. On comparing the results it was observed that they …
Study Of Solid-State Stability Of The Zoto Binary System, Sandeep A. Waghuley
Study Of Solid-State Stability Of The Zoto Binary System, Sandeep A. Waghuley
Turkish Journal of Physics
The ZOTO binary system contains different compositions of zinc oxide (ZnO) and tin oxide (SnO_2). These are important semiconductors and have been intensively explored for various applications. SnO_2, ZnO, and different mole ratios (70:30, 40:60, 30:70, and 20:80 SnO_2:ZnO) of the ZOTO system were prepared through proper thermal treatment in powder form. The comparative solid-state stability was investigated using thermogravimetric and differential thermal analysis (TG-DTA). The stability study showed that the SnO_2 material absorbs much lower heat (Ea = -72.06 kJ/g mol) compared with ZnO and their compositions. Thus the SnO_2 material shows stability at near room temperature operation. The …
Numerical Experiments For Determining Laser-Induced Temperature Fields, Lyubomir Kostadinov Lazov, Nikolay Angelov Petrov
Numerical Experiments For Determining Laser-Induced Temperature Fields, Lyubomir Kostadinov Lazov, Nikolay Angelov Petrov
Turkish Journal of Physics
Based on the equation of energy balance and the equation of heat conductivity with the help of specialized software, tentative engineering calculations were performed for the process of laser marking by melting and structural changes. The functional capabilities of the software product were examined. Distribution of temperature by layers for samples of tool steel was obtained.
Regular And Chaotic Motions In Hénon-Heiles Like Hamiltonian, Idugba Mathias Echi, Alexander Nwabeze Amah, Emmanuel Anthony
Regular And Chaotic Motions In Hénon-Heiles Like Hamiltonian, Idugba Mathias Echi, Alexander Nwabeze Amah, Emmanuel Anthony
Turkish Journal of Physics
The dynamics of a system subjected to a potential equal to the sum of the Hénon--Heiles potential and that of hydrogen in an electric field was studied. The 4 Hamilton's equations of motion follow from the Hamiltonian and they were integrated numerically using the Runge-Kutta fourth order method. The Poincaré surface of a section fixed at x = 0 and px> 0 was used to reduce the phase space to a 2-dimensional plane. The analysis of the Poincaré surface, the Lyapunov exponent, and the autocorrelation shows that as the constant of motion, E, increases from 0.30 to 0.45, the dynamics …
Quasi-Exact Thermodynamic Properties Of A Relativistic Spin-Zero System Under Cornell And Generalized Morse Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Quasi-Exact Thermodynamic Properties Of A Relativistic Spin-Zero System Under Cornell And Generalized Morse Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Turkish Journal of Physics
The thermodynamic properties of a relativistic spin-zero system are investigated via the Klein-Gordon equation under the Cornell and generalized Morse potentials. In particular, the partition function and mean and free energies are calculated and their behavior versus variations of the potential coefficients is presented.
Spin-One Dkp Equation In The Presence Of Nonminimal Vector Woods-Saxon Potential In (1 + 1) Dimensions, Hassan Hassanabadi, Zahra Molaee, Saber Zarrinkamar
Spin-One Dkp Equation In The Presence Of Nonminimal Vector Woods-Saxon Potential In (1 + 1) Dimensions, Hassan Hassanabadi, Zahra Molaee, Saber Zarrinkamar
Turkish Journal of Physics
The Duffin-Kemmer-Petiau equation in the presence of a nonminimal vector Woods-Saxon potential is solved for spin-one particles via the Nikiforov-Uvarov method. The reflection and transmission coefficients of the general form of the DKP equation in the presence of a nonminimal vector interaction are discussed.
Molecular Dynamic Simulation On Iron Corrosion-Reduction In High Temperature Molten Lead-Bismuth Eutectic, Artoto Arkundato, Zaki Su'ud, Mikrajuddin Abdullah, Widayani Sutrisno
Molecular Dynamic Simulation On Iron Corrosion-Reduction In High Temperature Molten Lead-Bismuth Eutectic, Artoto Arkundato, Zaki Su'ud, Mikrajuddin Abdullah, Widayani Sutrisno
Turkish Journal of Physics
Molecular dynamic simulation on iron in high-temperature molten lead-bismuth eutectic has been carried out to investigate the iron corrosion and its mitigation. The aim of the work is to investigate the corrosion and evaluate proper oxygen content of injection for significant and effective reduction. To study the phenomena we calculated the diffusion coefficients, radial distribution functions and mean square displacement of iron, and also observed the micro-structure of iron before and after oxygen injection into coolant. The present calculation shows that a significant and effective reduction of corrosion can be achieved by injection of 7.68 \times 10^{-2}-1.55 \times 10^{-1} wt\% …
Improved Hilbert Moment Thermal Qcd Sum Rules For B_S Meson And Stability With Respect To Moment Parameter, Elşen Veli̇, Gülşah Kaya, Arzu Türkan, Eni̇s Yazici
Improved Hilbert Moment Thermal Qcd Sum Rules For B_S Meson And Stability With Respect To Moment Parameter, Elşen Veli̇, Gülşah Kaya, Arzu Türkan, Eni̇s Yazici
Turkish Journal of Physics
In this paper, we deal with the temperature dependence of the leptonic decay constant and mass of B_s meson in the framework of the Hilbert moment QCD sum rule. In our calculations, we improve the thermal QCD sum rules, taking into account the thermal spectral density and the perturbative 2-loop order corrections to the correlation function. Moreover, we investigate the stability of the results with respect to the Hilbert moment parameter. Our numerical calculations demonstrate that the mass and decay constant are insensitive to the variation of temperature up to T \cong 100 MeV; however, after this value, they start …
Effect Of Stepwise Replacement Of Lif By Zno On Structural And Optical Properties Of Lif.B_2o_3 Glasses, Susheel Arora, Virender Kundu, Dev Raj Goyal, Anup Singh Maan
Effect Of Stepwise Replacement Of Lif By Zno On Structural And Optical Properties Of Lif.B_2o_3 Glasses, Susheel Arora, Virender Kundu, Dev Raj Goyal, Anup Singh Maan
Turkish Journal of Physics
Zinc fluoroborate glasses with compositions xZnO.(40 - x) LiF.60B_2O_3 (x = 0, 5, 10, 15, and 20) were synthesized by the melt-quench method. The amorphous nature of the glassy samples was confirmed by XRD analysis. The nature of the bonds formed and the role of various species in the composition of the glasses were examined using FTIR spectroscopy. FTIR analysis showed shifting of an absorption band with the addition of ZnO. A UV-visible study was carried out to calculate the optical band gap energy, E_gIt was found that E_gdecreased with increase in concentration of ZnO up to x = 15 …
Planar Waveguide With Left-Handed Material Guiding Film For Refractometry Applications, Taher M. El-Agez, Sofyan A. Taya, Mohamed M. Shabat, Hani M. Kullab
Planar Waveguide With Left-Handed Material Guiding Film For Refractometry Applications, Taher M. El-Agez, Sofyan A. Taya, Mohamed M. Shabat, Hani M. Kullab
Turkish Journal of Physics
A symmetric 3-layer slab waveguide with a left-handed material as a guiding layer is examined analytically for cover refractive index detection. The TM mode dispersion relation of the proposed waveguide is investigated. The sensitivity of the proposed sensor to changes in the cover refractive index and the power flowing within each layer are presented. Some unusual features are found; for example, the sensitivity of the proposed sensor is negative. Moreover, the sensitivity improvement compared with the conventional 3-layer waveguide sensor is approximately a factor of 6.
Theoretical Modeling And Numerical Solutions Of Some Standard Thermoluminescence Detector Crystals, Erdem Uzun
Theoretical Modeling And Numerical Solutions Of Some Standard Thermoluminescence Detector Crystals, Erdem Uzun
Turkish Journal of Physics
MCP-100, MYS-N, MTS-7, MTS-100, and MCP-N standard thermoluminescence detector materials are annealed and irradiated. Glow curves and all trap parameters are determined. For these materials new theoretical energy band models are suggested and differential equations governing the charge carrier traffics are derived. The equations are solved by using computer-based numerical methods. During the simulations, experimental data measured in the previous step are given to computer code as the initial conditions. Experimental and numerical results show that the electron-band structures of standard thermoluminescence crystals are represented fairly well by the suggested models.
Vacuum Properties Of Tarla, Hüsnü Aksakal, Ertan Arikan, Zafer Nergi̇z
Vacuum Properties Of Tarla, Hüsnü Aksakal, Ertan Arikan, Zafer Nergi̇z
Turkish Journal of Physics
The Turkish Accelerator and Radiation Laboratory at Ankara (TARLA) is a part of the Turkish Accelerator Center project, which was designed to produce an infrared free electron laser in the wavelength band of 2-250 mu m. The beamline of TARLA consists of 4 major sections: injector, beam transport line with linacs, optical cavities, and dump. All system components must be kept under ultrahigh vacuum standards to prevent beam scattering with residual gas. In the present study, the vacuum requirements of the beamline are defined and simulation vacuum and gas flow in the accelerator are presented.
Synthesis And Optical Characterization Of Zn_{1-X}Mg_Xs: Eu Nanoparticles, Alexander Nwabueze Amah, Audu Onoja, Richard Akpagher
Synthesis And Optical Characterization Of Zn_{1-X}Mg_Xs: Eu Nanoparticles, Alexander Nwabueze Amah, Audu Onoja, Richard Akpagher
Turkish Journal of Physics
Zn_{1-x}Mg_xS: Eu^{3+} nanoparticles were synthesized by a facile co-precipitation technique with varying magnesium concentrations (0 =< x =< 0.20). X-ray diffraction results showed a mixture of cubic and hexagonal structures. There was an observed peak shift towards higher angles, decrease in peak intensities, disappearance of other peaks, and increase in diffraction peak broadening as Mg concentration increased. The estimated average particle sizes ranged from 2.0 nm to 8.79 nm. Scanning electron microscopy results showed smooth and uniform surface morphology. Energy dispersive X-ray studies indicated that the samples contained mainly Zn, S, and Eu because of the low detection limit for Mg. UV-Vis absorption spectrophotometer results showed a blue shift in energy due to quantum confinement as Mg concentration increased.
Optimization Of Laser Marking With The Help Of Simulation Models, Lyubomir Kostadimov Lazov, Nikolay Angelov Petrov
Optimization Of Laser Marking With The Help Of Simulation Models, Lyubomir Kostadimov Lazov, Nikolay Angelov Petrov
Turkish Journal of Physics
This article covers the results of several numerical experiments carried out with specific software working under MATLAB for marking of tool steel and electronic elements. CuBr and Nd:YAG lasers were used in this study. Simulations with 3 different durations of pulse of laser radiation were achieved. Numerical calculations were performed with values (for laser sources and technological parameters) based on real experiments.
A Fission Model Approach To Alpha Decay And Cluster Radioactivity Of Dy, Er, And Yb Isotopes, Kizhakkath Kalam Girija, Antony Joseph
A Fission Model Approach To Alpha Decay And Cluster Radioactivity Of Dy, Er, And Yb Isotopes, Kizhakkath Kalam Girija, Antony Joseph
Turkish Journal of Physics
Rare earth nuclei are probable candidates for exhibiting cluster radioactivity. In the present work, a theoretical study of alpha decay and heavy cluster emission from Dy, Er, and Yb nuclei in the mass range 150 < A < 190 has been carried out in a fission model approach. Some of the proton-rich isotopes of these nuclei are found to have long half-lives, but within the measurable range. Many of the neutron-rich isotopes under consideration are far from beta stability and the most probable light clusters predicted are highly exotic in nature and the corresponding half-lives are extremely short. However, the decays of most probable heavy clusters predicted have half-lives in the measurable range. The calculations on neutron-rich isotopes indicate the emergence of new magic numbers for protons and neutrons. The centrifugal barrier effect on decay rate of some proton-rich Er isotopes is also investigated.
Bound States And The Oscillator Strengths For The Klein-Gordon Equation Under Möbius Square Potential, Hassan Hassanabadi, Bentol Hoda Yazarloo, Saber Zarrinkamar
Bound States And The Oscillator Strengths For The Klein-Gordon Equation Under Möbius Square Potential, Hassan Hassanabadi, Bentol Hoda Yazarloo, Saber Zarrinkamar
Turkish Journal of Physics
The Klein-Gordon equation under the equal scalar and vector Möbius square potentials in D-dimensions is solved by using the Nikiforov-Uvarov method. The energy eigenvalues and the corresponding eigenfunctions are obtained and numerically calculated. The oscillator strengths are determined and discussed in terms of parameters of the system.
Analyses Of Elastically Scattered Charged Pions From Calcium Isotopes And The ^{48}Ca-^{54}Fe Isotone At 180 Mev, Zuhair Fayyad Mahmoud Shehadeh
Analyses Of Elastically Scattered Charged Pions From Calcium Isotopes And The ^{48}Ca-^{54}Fe Isotone At 180 Mev, Zuhair Fayyad Mahmoud Shehadeh
Turkish Journal of Physics
The elastic scattering of 180 MeV positively and negatively charged pions, incident on a set of calcium isotopes and the isotone ^{48}Ca - ^{54}Fe, has been analyzed within the framework of a recently updated simple local optical potential. This potential, particularly at the tail region, has been originally determined from available phase shifts using inverse scattering theory and the Klein--Gordon equation as a guide. The analysis is carried out with and without considering the squared potential term in the Klein-Gordon equation. Coulomb effects are accounted for by implementing Stricker's prescription. The numerical results for the angular distributions with isotopic and …
Symmetry And The Order Of Events In Time: Description Of A Reversible Thermal Energy Converter Composed Of Negative Mass, Randy Wayne
Turkish Journal of Physics
In a previous paper [1], we analyzed the sequence of events that occurs in the time domain of a reversible cyclical thermal energy converter using the Gibbs equation and showed that even when there is no net change of entropy there is an asymmetrical order of quasi-static states along the time axis, when thermal energy is converted into mechanical pressure-volume work. The spontaneous evolution towards an equilibrium state, which is characterized by the unidirectional transport of entropy from the hot reservoir to the cold reservoir, is coincident with this asymmetrical order of events. In this paper, we \"mend\" the above …
Thermodynamic Properties Of The Noncommutative Black Hole In (Z = 3)-Horava-Lifshitz Gravity, Mourad Nach, Khadija Bilal, My Brahim Sedra, Abderrahman El Boukili
Thermodynamic Properties Of The Noncommutative Black Hole In (Z = 3)-Horava-Lifshitz Gravity, Mourad Nach, Khadija Bilal, My Brahim Sedra, Abderrahman El Boukili
Turkish Journal of Physics
In this work, we investigate the effects of noncommutative spaces on the Horava-Lifshitz black hole. We construct the black hole solutions in the noncommutative space of (z = 3)-Horava-Lifshitz gravity. We calculate the horizon and the thermodynamic properties such as the Hawking temperature, the ADM-Mass, and entropy, which reduce to their commutative limits when the noncommutativity parameter tends to zero.
Temperature Dependence For The Synthetic Magnetization Of A Rotating Bose Gas In Harmonic Trap, Azza M. Elbadry
Temperature Dependence For The Synthetic Magnetization Of A Rotating Bose Gas In Harmonic Trap, Azza M. Elbadry
Turkish Journal of Physics
In this paper, the temperature dependence for synthetic magnetization \bar M of a rotating Bose gas in harmonic trap and the magnetic field dependence of the critical temperature are investigated. A simple semiclassical approximation for the density of state approach is used in this study. The suggested approach simultaneously gives corrections to quantities which arise from the finite size and interatomic interaction effects. The calculated results show that the critical temperature decreases due to the increase of the synthetic magnetic field. The synthetic magnetization also exhibits a characteristic temperature dependence. It is proportional to T^3 if \bar T < \bar T_c, while it is proportional to T if \bar T > \bar T_c. …
One Proton Emission With Structural Effects In Medium Mass Nuclei, Chandrasekaran Anu Radha, Velayudham Ramasubramanian
One Proton Emission With Structural Effects In Medium Mass Nuclei, Chandrasekaran Anu Radha, Velayudham Ramasubramanian
Turkish Journal of Physics
In this work proton emission from deformed nuclei is discussed with the quadrupole deformation values. The deformation is investigated using potential energy surface plots. The identified proton emitters are found to have odd Z since the unpaired proton is less bound, and they are readily available for emission. Using the exotic decay model to the medium mass nuclei, the new proton emitters are analyzed with the inclusion of centrifugal barrier. The proton decay half-lives are calculated and compared with literature values. A discussion pertaining to single proton emission with structural effect will be a pivotal point in our study.
Spin Assignment And Behavior Of Superdeformed Bands In A\\Sim 150 Mass Region, Ali Khalaf, Manal Sirag, Mahmoud Taha
Spin Assignment And Behavior Of Superdeformed Bands In A\\Sim 150 Mass Region, Ali Khalaf, Manal Sirag, Mahmoud Taha
Turkish Journal of Physics
The smoothed experimental dynamical moment of inertia J^{(2)} values were fitted with a theoretical version using the Harris three parameter formula in even powers of angular frequency \omega, derived for results from the cranking model. The expansion parameters were adjusted by using a computer simulated search program. The best expansion parameters from the fit were used to assign the spins of the superdeformed (SD) rotational bands (RB) by integrating the calculated J^{(2)}. The data set includes 23 RB's in 11 SD nuclei, which show no evidence of either irregular behavior near the bottom of the bands or abrupt angular momentum …
The Nonrelativistic Molecular Tietz Potential, Hossein Nikoofard, Elham Maghsoodi, Saber Zarrinkamar, Mohsen Farhadi, Hassan Hassanabadi
The Nonrelativistic Molecular Tietz Potential, Hossein Nikoofard, Elham Maghsoodi, Saber Zarrinkamar, Mohsen Farhadi, Hassan Hassanabadi
Turkish Journal of Physics
We solve the 3-dimensional Schrödinger equation under the Tietz potential by an approximate analytical scheme. A Pekeris-type approximation and the Nikiforov--Uvarov technique are used in the calculations to report the arbitrary-state eigenfunctions and eigenvalues and we calculate some useful expectation values of the Tietz potential using the Hellmann-Feynman theorem and obtain the oscillator strength.
Dkp Equation Under Scalar And Vector Kratzer Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Dkp Equation Under Scalar And Vector Kratzer Potentials, Bentol Hoda Yazarloo, Hassan Hassanabadi, Saber Zarrinkamar
Turkish Journal of Physics
Approximate analytical solutions of Duffin-Kemmer-Petiau (DKP) equation under scalar and vector Kratzer terms are obtained via an elegant ansatz after successive transformations. The results, after application of proper fits, can be used in the study of relativistic spinless particles in various branches of physics such as cosmology and theoretical nuclear physics including meson spectroscopy.
Empirical Rule For The Pair Break Mechanism In Three-Quasiparticle Rotational Bands, Sukhjeet Singh Dhindsa, Sushil Kumar, Jatinder Kumar Sharma
Empirical Rule For The Pair Break Mechanism In Three-Quasiparticle Rotational Bands, Sukhjeet Singh Dhindsa, Sushil Kumar, Jatinder Kumar Sharma
Turkish Journal of Physics
An empirical rule on the basis of odd-even mass difference is suggested for the breaking of a proton pair or a neutron pair in odd-A nuclei to form a lower lying 3-quasiparticle state. If \Delta_p is smaller than \Delta_n, the proton pair breaks; on the other hand, if \Delta_n is smaller than \Delta_p, the neutron pair breaks down and forms a lower lying 3-quasiparticle state in an odd-A nuclide. This rule appears not only purely based on the proton paring/neutron pairing energy balancing condition but also on particular excitation energy, which is \ge 1 MeV in the case of the …
Study Of Zone Center Phonons In Wolframite Znwo_4, Ruby Jindal, Murari Mohan Sinha, Hem Chandra Gupta
Study Of Zone Center Phonons In Wolframite Znwo_4, Ruby Jindal, Murari Mohan Sinha, Hem Chandra Gupta
Turkish Journal of Physics
A short-range force constant model was applied to investigate the phonons in wolframite ZnWO_4 crystals in their monoclinic phase having space group P2/c and symmetry C_{2h}. The normal symmetry coordinates for the monoclinic wolframite were computed. The zone center phonons were calculated by using 8 stretching and 6 bending force constants. The calculated results are in very good agreement with the observed ones. The infrared frequencies were assigned for the first time. The potential energy distribution was also investigated for determining the significance of the contribution from each force constant toward the Raman and infrared wavenumbers.