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High Pressure Behavior of Sr3(VO4)2and Ba3(VO4)2

✍ Scribed by Andrzej Grzechnik; Paul F. McMillan

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 453 KB
Volume: 132
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7435

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✦ Synopsis

We have studied pressure-induced transitions and structural changes in isostructural strontium and barium orthovanadates, Sr 3 (VO 4 ) 2 and Ba 3 (VO 4 ) 2 , via Raman spectroscopy. The spectral changes in Ba 3 (VO 4 ) 2 can be interpreted as being due to condensation of VO 3؊ 4 units into edge-or corner-shared octahedra with little or no hysteresis on decompression. For Sr 3 (VO 4 ) 2 , there is a pressure-induced first-order phase change at about 150 kbar, with large hysteresis on decompression, which can be rationalized as a transition into a spinelloid series of structures, retaining the tetrahedral coordination of the V atoms.

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