Phase stability of some rare earth trihydrides under high pressure
| Autor: | M.A. Kuzovnikov, M. Tkacz, H. Meng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Argon Renewable Energy Sustainability and the Environment Gadolinium Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Diamond anvil cell Erbium symbols.namesake Fuel Technology chemistry Phase (matter) 0103 physical sciences symbols Lanthanum 010306 general physics 0210 nano-technology Raman spectroscopy Raman scattering |
| Zdroj: | International Journal of Hydrogen Energy. 42:29344-29349 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2017.10.067 |
| Popis: | Phase stability of lanthanum, gadolinium and erbium trihydides have been studied at high pressure in diamond anvil cell. Raman high pressure studies up to 40 GPa of lanthanum trihydride and deuteride have shown more complex spectra than one can expect from the factor group analysis for stoichiometric LaH3. Our studies have shown that the stoichiometric lanthanum trihydride and deutride undergo pressure induced phase transformation presumably of hydrogen ordering origin. Investigations of the phase stability of erbium and gadolinium trihydrides have been performed using argon as pressure transmitting medium in Raman scattering method. The same medium has been used for X-ray diffraction analysis under pressure for erbium trihydride. Significant difference in the transition pressure as compared to earlier results obtained in quasi hydrostatic conditions has been noticed both in X-ray and Raman scattering measurements. Deviatoric stresses present in earlier nonhydrostatic measurements can be blamed for its discrepancy. |
| Databáze: | OpenAIRE |
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