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Articles 1 - 13 of 13
Full-Text Articles in Physical Sciences and Mathematics
Studies Of Maximum Supercooling And Stirring In Levitated Liquid Metallic Alloys, Mark Edward Sellers
Studies Of Maximum Supercooling And Stirring In Levitated Liquid Metallic Alloys, Mark Edward Sellers
Arts & Sciences Electronic Theses and Dissertations
Nucleation—or the formation of some cluster in a medium undergoing a phase transition—is usually the initial step in a phase transition. However, this process is still not fully understood, as outstanding questions related to the role of structure, local order, and diffusion remain unanswered. Systematic supercooling studies on metallic liquids performed using electrostatic and electromagnetic (ESL and EML, respectively) will be presented and discussed within the context of several nucleation theories, such as the Classical Nucleation Theory, Diffuse Interface Theory, and Coupled-Flux theory. To study the role of diffusion on nucleation, studies on the International Space Station using the on-board …
Metallic State Two-Dimensional Holey-Structured Co3fen Nanosheets As Stable And Bifunctional Electrocatalysts For Zinc–Air Batteries, Haipeng Guo, Xuanwen Gao, Nengfei Yu, Zhi Zheng, Wenbin Luo, Chang Wu, Hua-Kun Liu, Jiazhao Wang
Metallic State Two-Dimensional Holey-Structured Co3fen Nanosheets As Stable And Bifunctional Electrocatalysts For Zinc–Air Batteries, Haipeng Guo, Xuanwen Gao, Nengfei Yu, Zhi Zheng, Wenbin Luo, Chang Wu, Hua-Kun Liu, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
Exploring economically efficient electrocatalysts with robust bifunctional oxygen conversion catalytic activity and designing appropriate structures are essential to realize ideal zinc-Air batteries with high energy density and long lifespan. Two-dimensional metallic state Co3FeN nanosheets with a holey-structured architecture are designed and shown to exhibit enhanced catalytic properties owing to the complete exposure of the atoms in the large lateral surfaces and in the edges of pore areas, together with the lowest OH∗ adsorption energy on exposed surfaces due to bimetallic synergistic effects. Meanwhile, this porous architecture can not only accelerate electron transportation by its metallic state highly oriented crystallized structure, …
Electronic Structures Of Lanthanum, Samarium, And Gadolinium Sulfides, Lu Wang, Chris M. Marin, Wai-Ning Mei, Chin Li Cheung
Electronic Structures Of Lanthanum, Samarium, And Gadolinium Sulfides, Lu Wang, Chris M. Marin, Wai-Ning Mei, Chin Li Cheung
Physics Faculty Publications
In this study, we report our efforts to elucidate the electronic structures of two lattice structures of lanthanide sulfides (LnS and Ln3S4) and for three lanthanides (Ln = La, Sm and Gd) using density functional theory calculations performed with the CASTEP code. A DFT+U method was used for the corrections of on-site Coulomb interactions with U = 6 eV. The calculated electronic structures show that both lanthanum and gadolinium sulfides have metallic properties, consistent with the available experimental results. However, the calculated electronic structure of Sm3S4 is considerably different from those of the La3S4 and Gd3S4 and is predicted to …
Spin Fluctuations In The Exotic Metallic State Of Sr2ruo4 Studied With Β-Nmr, David L. Cortie, T Buck, M H. Dehn, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, M R. Pearson, Z Salman, Y Maeno, W A. Macfarlane
Spin Fluctuations In The Exotic Metallic State Of Sr2ruo4 Studied With Β-Nmr, David L. Cortie, T Buck, M H. Dehn, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, M R. Pearson, Z Salman, Y Maeno, W A. Macfarlane
Australian Institute for Innovative Materials - Papers
A β-NMR study was performed on a Sr2RuO4 crystal in the metallic state using a beam of spin-polarized 8Li+ implanted at a mean depth of 90 nm. The 8Li+ spin-lattice relaxation rate is strongly influenced by the onset of incommensurate spin fluctuations. The nuclear relaxation rate can be explained using previously published bulk 17O NMR and inelastic neutron spectroscopy measurements of the dynamic magnetic susceptibility to model the hyperfine coupling. A well-resolved quadrupolar-split NMR for 8Li+ implies a static stopping position in an interstitial site. The 8Li+ Knight shift is highly sensitive to the anisotropic static susceptibility.
A Class Of Rare Antiferromagnetic Metallic Oxides: Double Perovskite Amn(3)V(4)O(12) (A = Na+, Ca2+, And La3+) And The Site-Selective Doping Effect, Guangbiao Zhang, Yuan Xu Wang, Zhenxiang Cheng, Yuli Yan, Chengxiao Peng, Chao Wang, Shuai Dong
A Class Of Rare Antiferromagnetic Metallic Oxides: Double Perovskite Amn(3)V(4)O(12) (A = Na+, Ca2+, And La3+) And The Site-Selective Doping Effect, Guangbiao Zhang, Yuan Xu Wang, Zhenxiang Cheng, Yuli Yan, Chengxiao Peng, Chao Wang, Shuai Dong
Australian Institute for Innovative Materials - Papers
We have investigated the structural, electronic, and magnetic properties of A-site-ordered double-perovskitestructured oxides, AA'3B4O12 (A = Na, Ca, and La) with Mn and V at A' and B sites, respectively, using firstprinciple calculations based on the density functional theory. Our calculation results show that the antiferromagnetic phase is the ground state for all the compounds. By changing the A-site ions from Na+ to Ca2+ and then to La3+, the transfer of charge between Mn and O ions was changed from 1.56 to 1.55 and then to 1.50, and that between the …
Electronic Device Incorporating Memristor Made From Metallic Nanowire, Douglas R. Strachan, Stephen L. Johnson
Electronic Device Incorporating Memristor Made From Metallic Nanowire, Douglas R. Strachan, Stephen L. Johnson
Physics and Astronomy Faculty Patents
An electronic device includes a first electrode, a second electrode and a nanowire connected between the first and second electrodes to allow electric current flow. The nanowire is made from a conductive material exhibiting a variable resistance due to electromigration. The nanowire is repeatably switchable between two states. A voltage clamp operates through feedback control to maintain the voltage across the nanowire and prevent thermal runaway.
Interaction Of The Mu-Cyclohexadienyl Radical With Metallic (Au, Pt) Nanoparticles In Mesoporous Silica, J Xiao, D J. Arseneau, M D. Bridges, David L. Cortie, S P. Cottrell, M H. Dehn, D G. Fleming, J A. Kelly, R F. Kiefl, W A. Macfarlane, M J. Maclachlan, I Mckenzie
Interaction Of The Mu-Cyclohexadienyl Radical With Metallic (Au, Pt) Nanoparticles In Mesoporous Silica, J Xiao, D J. Arseneau, M D. Bridges, David L. Cortie, S P. Cottrell, M H. Dehn, D G. Fleming, J A. Kelly, R F. Kiefl, W A. Macfarlane, M J. Maclachlan, I Mckenzie
Australian Institute for Innovative Materials - Papers
SR and ALCR techniques have been used to investigate the structure and dynamics of the Mu-cyclohexadienyl radical interacting with Au and Pt metal nanoparticles (MNPs) supported in mesoporous silica (SBA-15). Surprisingly, coherent precession signals are observed and the isotropic hyperne coupling constants are almost the same in loaded and unloaded samples, implying that the electronic structure of MuC6H6 is only weakly perturbed by the presence of the MNPs. We propose the observed radicals are shielded from the metallic surfaces by a benzene coating on the MNPs. The 1 resonance is observable in MNP-loaded samples at higher temperatures than in the …
Ambient Scalable Synthesis Of Surfactant-Free Thermoelectric Cuagse Nanoparticles With Reversible Metallic-N-P Conductivity Transition, Chao Han, Qiao Sun, Zhenxiang Cheng, Jianli Wang, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Ambient Scalable Synthesis Of Surfactant-Free Thermoelectric Cuagse Nanoparticles With Reversible Metallic-N-P Conductivity Transition, Chao Han, Qiao Sun, Zhenxiang Cheng, Jianli Wang, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Australian Institute for Innovative Materials - Papers
Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e., from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) …
Phase Diagrams Of The Metallic Zigzag Carbon Nanotube, J E. Bunder, Hsiu-Hau Lin
Phase Diagrams Of The Metallic Zigzag Carbon Nanotube, J E. Bunder, Hsiu-Hau Lin
Faculty of Informatics - Papers (Archive)
We investigate a metallic zigzag carbon nanotube by means of a Hubbard model, which includes both on-site and nearest-neighbor interactions. Assuming weak interactions, a renormalization group analysis of the equivalent two-leg ladder followed by bosonization and refermionization results in a Gross-Neveu model with an enlarged symmetry relative to the original Hamiltonian. For the undoped case the symmetry of the Gross-Neveu model is SO_8_, but for the doped case the particle-hole symmetry is broken and the symmetry reduces to SO_6_. Four ground-state phases are found in the undoped carbon nanotube with repulsive interactions, a d-wave Mott insulator, an s-wave Mott insulator, …
Dynamical Symmetry Enlargement In Metallic Zigzag Carbon Nanotubes, J E. Bunder, Hsiu-Hau Lin
Dynamical Symmetry Enlargement In Metallic Zigzag Carbon Nanotubes, J E. Bunder, Hsiu-Hau Lin
Faculty of Informatics - Papers (Archive)
No abstract provided.
Thermolectric Materials Based On Intercalated Layered Metallic Systems, Peter C. Eklund, Leonid Grigorian, Keith A. Williams, Gamini U. Sumanasekera
Thermolectric Materials Based On Intercalated Layered Metallic Systems, Peter C. Eklund, Leonid Grigorian, Keith A. Williams, Gamini U. Sumanasekera
Physics and Astronomy Faculty Patents
A novel thermoelectric material in the form of a unit cell including a first reagent intercalated as a semiconducting layer into a metallic layered host and a method for producing the thermoelectric material are disclosed. The unit cell is characterized by a Seebeck coefficient S of 80-140 μV/K° and an electrical conductivity σ of 103 -104 (Ωcm)-1, as well as a figure of merit Z of about 2×10-3 K-1 at 100° K.
Alkali Metal Adsorbates On W(110): Ionic, Covalent, Or Metallic?, D. Mark Riffe, G. K. Wertheim, P. H. Citrin
Alkali Metal Adsorbates On W(110): Ionic, Covalent, Or Metallic?, D. Mark Riffe, G. K. Wertheim, P. H. Citrin
All Physics Faculty Publications
The photoemission signal from the first atomic layer of W(110) is used to assess the nature of the interaction between the surface atoms of the metal substrate and the adsorbates Na, K, and Cs for coverages up to 1 atomic layer. Our results indicate that there is little or no charge transfer from the alkali metal to the W surface, even in the limit of low coverage. The satellite structure of the photoemission lines of the outermost p shell of the alkali metals confirms this conclusion. While contrary to the conventional picture of alkali-metal-charge donation, these findings fully support recent …
The Benefication Of A Low-Grade, Montana Scheelite Ore, Walter G. Parker
The Benefication Of A Low-Grade, Montana Scheelite Ore, Walter G. Parker
Bachelors Theses and Reports, 1928 - 1970
The increasing importance of tungsten as an industrial metal and the recent discoveries of extensive deposits of low-grade tungsten ores in Montana led to the investigation which is reported in this paper. The purpose of this investigation was to determine if a saleable concentrate could be obtained from one of these low-grade, Montana scheelite ores.