1. Crystal structure and high-pressure properties of γ-Mo2N determined by neutron powder diffraction and X-ray diffraction
- Author
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Olga Shebanova, Craig L. Bull, Tetsuya Kawashima, Laurent Chapon, Denis Machon, Paul F. McMillan, Emmanuel Soignard, Dominik Daisenberger, and Eiji Takayama-Muromachi
- Subjects
Diffraction ,Chemistry ,Rietveld refinement ,Neutron diffraction ,Condensed Matter Physics ,Diamond anvil cell ,Electronic, Optical and Magnetic Materials ,Inorganic Chemistry ,Crystallography ,symbols.namesake ,X-ray crystallography ,Materials Chemistry ,Ceramics and Composites ,symbols ,Physical and Theoretical Chemistry ,Raman spectroscopy ,Powder diffraction ,Electron backscatter diffraction - Abstract
We prepared samples of cubic γ-MoNx (x∼0.5) by high-pressure–high-temperature synthesis. N atom site occupancies within the defect rock salt structure were determined from time-of-flight neutron diffraction and powder X-ray diffraction data by Rietveld analysis. The results show that N atoms occupy only octahedral sites within the structure. The semi-metallic compound is a superconductor, with T c = 5.2 K determined by SQUID magnetometry. The compressibility of the material was determined by synchrotron X-ray diffraction measurements at high pressure in the diamond anvil cell. The vibrational density of states was studied by Raman scattering spectroscopy.
- Published
- 2006
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