Pressure-induced phase transitions in chromium thiospinels

Paz Vaqueiro, A. V. Powell, S. Hull, D. A. Keen

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The pressure and temperature dependence of the structure of CoCr2S4 and Co0.65Ni0.35Cr2S4 have been studied by in situ time-of-flight powder neutron diffraction. While the thiospinel CoCr2S4 transforms to a defect NiAs-type phase at 1.3 GPa and 800 °C, the nickel-doped thiospinel undergoes this phase change at 0.4 GPa and 750 °C. Quenching of the hexagonal high-temperature and high-pressure phase resulted in a transition to a monoclinic Cr3S4 phase, due to the ordering of the metal vacancies in every second layer. Moreover, the spinel CoCr2S4 transforms at room temperature and 8.6 GPa to a phase which does not exhibit a NiAs-type structure.

Original languageEnglish
Article number064106
Pages (from-to)641061-641066
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume63
Issue number6
Publication statusPublished - 2001

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    Vaqueiro, P., Powell, A. V., Hull, S., & Keen, D. A. (2001). Pressure-induced phase transitions in chromium thiospinels. Physical Review B: Condensed Matter and Materials Physics, 63(6), 641061-641066. [064106].