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RESEARCH PRODUCT
Pressure-Induced Transformations in PrVO4 and SmVO4 and Isolation of High-Pressure Metastable Phases
Avesh K. TyagiDaniel ErrandoneaS. Nagabhusan AcharyJulio Pellicer-porressubject
DiffractionPhase transitionChemistryAnalytical chemistryInorganic Chemistrysymbols.namesakechemistry.chemical_compoundPhase (matter)ScheeliteMonaziteMetastabilitysymbolsPhysical and Theoretical ChemistryRaman spectroscopyHydrogen productiondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-04-23 | Inorganic Chemistry |