9 research outputs found
Investigation of the crystal structure of a basic bismuth(III) nitrate with the composition [Bi6O4(OH)(4)](0.54(1))[Bi6O5(OH)(3)](0.46(1))(NO3)(5.54(1))
Get PDFA Study of the Structural Stability of TiC, TiN and TiO in the Pressure Range up to 65 GPa Using Synchroton Radiation.
Full text linkThermal decomposition of monocalcium aluminate decahydrate ( CaAl<sub>2</sub>O<sub>4</sub>.10H<sub>2</sub>O)Â investigated by in-situ synchrotron X-ray powder diffraction, thermal analysis and <sup>27</sup>Al, <sup>2</sup>H MAS NMR spectroscopy.
No full textA Study of the Structural Stability of TiC, TiN and TiO in the Pressure Range up to 65 GPa Using Synchroton Radiation
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Hard superconducting nitrides
Get PDFDetailed study of the equation of state, elasticity, and hardness of selected superconducting transition-metal nitrides reveals interesting correlations among their physical properties. Both the bulk modulus and Vickers hardness are found to decrease with increasing zero-pressure volume in NbN, HfN, and ZrN. The computed elastic constants from first principles satisfy c(11) > c(12) > c(44) for NbN, but c(11) > c(44) > c(12) for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic δ-NbN superconducting phase possesses a bulk modulus of 348 GPa, comparable to that of cubic boron nitride, and a Vickers hardness of 20 GPa, which is close to sapphire. Theoretical calculations for NbN show that all elastic moduli increase monotonically with increasing pressure. These results suggest technological applications of such materials in extreme environments
