Pressure-induced transformations in PrVO4 and SmVO4 and isolation of high-pressure metastable phases.
Inorg Chem
; 52(9): 5464-9, 2013 May 06.
Article
em En
| MEDLINE
| ID: mdl-23600563
ABSTRACT
Zircon-type PrVO4 and SmVO4 have been studied by high-pressure Raman spectroscopy up to 17 GPa. The occurrence of phase transitions has been detected when compression exceeds 6 GPa. The transformations are not reversible. Raman spectra of the high-pressure phases show similarities with those expected for a monazite-type phase in PrVO4 and a scheelite-type phase in SmVO4.The high-pressure phases have been also synthesized using a large-volume press and recovered at ambient conditions. X-ray diffraction measurements of the metastable products recovered after decompression confirms the monazite (PrVO4) and scheelite (SmVO4) structures of the high-pressure phases. Based upon optical properties of the reported new polymorphs, novel applications for rare-earth vanadates are proposed, including photocatalytic hydrogen production.
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MEDLINE
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article