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Full-Text Articles in Physical Sciences and Mathematics
A Custom Battery For Operando Neutron Powder Diffraction Studies Of Electrode Structure, Wei Kong Pang, Vanessa Peterson
A Custom Battery For Operando Neutron Powder Diffraction Studies Of Electrode Structure, Wei Kong Pang, Vanessa Peterson
Australian Institute for Innovative Materials - Papers
Structure-property relations are central to understanding functional materials, and for battery research the use of neutron powder diffraction to reveal the atomistic and molecular-scale origin of battery performance characteristics is often essential. Although operando experiments of this kind are increasingly common as neutron sources and instrumentation advance, these experiments are hindered by the often large barrier presented by the preparation of whole batteries that yield a neutron diffraction signal from the electrode of interest that is sufficient to extract detailed structural information. This article presents a custom battery that is specifically designed for operando neutron powder diffraction. The battery is …
Thermolysis And Solid State Nmr Studies Of Nab3h8, Nh3b3h7, And Nh4b3h 8, Zhenguo Huang, Mitch Eagles, Spencer Porter, Eric G. Sorte, Beau Billet, Robert L. Corey, Mark S. Conradi, Ji-Cheng Zhao
Thermolysis And Solid State Nmr Studies Of Nab3h8, Nh3b3h7, And Nh4b3h 8, Zhenguo Huang, Mitch Eagles, Spencer Porter, Eric G. Sorte, Beau Billet, Robert L. Corey, Mark S. Conradi, Ji-Cheng Zhao
Australian Institute for Innovative Materials - Papers
In an effort to broaden the search for high-capacity hydrogen storage materials, three triborane compounds, NaB3H8, NH 3B3H7, and NH4B3H 8, were studied. In addition to hydrogen, thermal decomposition also releases volatile boranes, and the relative amounts and species depend on the cations (Na+, NH4 +) and the Lewis base (NH 3). Static-sample hydrogen NMR is used to probe molecular motion in the three solids. In each case, the line width decreases from low temperatures to room temperature in accordance with a model of isotropic or nearly isotropic reorientations. Such motions also explain a deep minimum in the relaxation time …
Synthesis, Structural Analysis, And Thermal Decomposition Studies Of [(Nh3)2bh2]B3h8, Zhenguo Huang, Hima K. Lingam, Xuenian Chen, Spencer Porter, Aijun Du, Patrick M. Woodard, Sheldon Shore, Ji-Cheng Zhao
Synthesis, Structural Analysis, And Thermal Decomposition Studies Of [(Nh3)2bh2]B3h8, Zhenguo Huang, Hima K. Lingam, Xuenian Chen, Spencer Porter, Aijun Du, Patrick M. Woodard, Sheldon Shore, Ji-Cheng Zhao
Australian Institute for Innovative Materials - Papers
Boron–nitrogen containing compounds with high hydrogen contents as represented by ammonia borane (NH3BH3) have recently attracted intense interest for potential hydrogen storage applications. One such compound is [(NH3)2BH2]B3H8 with a capacity of 18.2 wt% H. Two safe and efficient synthetic routes to [(NH3)2BH2]B3H8 have been developed for the first time since it was discovered 50 years ago. The new synthetic routes avoid a dangerous starting chemical, tetraborane (B4H10), and afford a high yield. Single crystal X-ray diffraction analysis reveals N–Hd+…Hd2–B dihydrogen interactions in the [(NH3)2BH2]B3H8?18- crown-6 adduct. Extended strong dihydrogen bonds were observed in pure [(NH3)2BH2]B3H8 through crystal structure solution …
Raman Scattering Studies Of Strain Effects In (100) And (311)B Gaas 1-Xbix Epitaxial Layers, J A. Steele, Roger A. Lewis, M Henini, O M. Lemine, A Alkaoud
Raman Scattering Studies Of Strain Effects In (100) And (311)B Gaas 1-Xbix Epitaxial Layers, J A. Steele, Roger A. Lewis, M Henini, O M. Lemine, A Alkaoud
Australian Institute for Innovative Materials - Papers
We report room-temperature Raman studies of strained (100) and (311)B GaAs1-xBix epitaxial layers for x ≤ 0.039. The Raman spectra exhibit a two-mode behavior, as well as disorder-activated GaAs-like phonons. The experimental results show that the GaAs-like LO(Γ) mode experiences a strong composition-dependent redshift as a result of alloying. The peak frequency decreases linearly from the value for pure GaAs (∼293 cm-1) with the alloyed Bi fraction x and the introduced in-plane lattice strain ε, by Δ ω LO = Δ ω alloy-Δ ω strain. X-ray diffraction measurements are used to determine x and ε allowing Δ ω alloy to …
Synthesis And Electrochemical Studies On Li2cusno4 And Li2cusnsio6 As Negative Electrode In Lithium Batteries, Atef Y. Shenouda, Hua-Kun Liu
Synthesis And Electrochemical Studies On Li2cusno4 And Li2cusnsio6 As Negative Electrode In Lithium Batteries, Atef Y. Shenouda, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Li2CuSnO4 and Li2CuSnSiO6 were prepared from their precursors compounds using Brij surfactant and a hydrothermal autoclave method. X-ray diffraction characterization revealed that the crystal structures of these compounds were tetragonal. Scanning electron microscope investigation showed the particle size morphology of Li2CuSnSiO6 is larger than that of Li2CuSnO4. Electrochemical impedance spectroscopy (EIS) explained that Li2CuSnO4 cell had higher charge transfer resistance (Rct = 2936Ω) than that of Li2CuSnSiO6 (38Ω). Furthermore, the reversible specific discharge capacity of the Li2CuSnSiO6 …
Electron Microscope Studies Of Al-Fe-Si Intermetallics In An A1-11 Percent Alloy, M V. Kral, P N H Nakashima, D Rg Mitchell
Electron Microscope Studies Of Al-Fe-Si Intermetallics In An A1-11 Percent Alloy, M V. Kral, P N H Nakashima, D Rg Mitchell
Australian Institute for Innovative Materials - Papers
Al-Fe-Si intermetallic particles in both unmodified and highly modified sand-cast eutectic AI-11.7 pct Si alloys were characterized using scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and convergent beam and selected area electron diffraction. The only two Al-Fe-Si intermetallics observed in this particular alloy are (1) ‘‘Chinese-script’’ morphology, consistent with a description of body-centered cubic a-A119Fe4MNSi2 and (2) plate-shaped, consistent with tetragonal d-A1eFeSi2. The authors are unaware of any other characterization of d-A1eFeSi2 using convergent beam electron diffraction (CBED) and selected area diffraction (SAD) techniques.