Pressure-Induced Transformations in PrVO4 and SmVO4 and Isolation of High-Pressure Metastable Phases

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• 作者：Daniel Errandonea ; S. Nagabhusan Achary ; Julio Pellicer-Porres ; Avesh K. Tyagi
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 6, 2013
• 年：2013
• 卷：52
• 期：9
• 页码：5464-5469
• 全文大小：279K
• 年卷期：v.52,no.9(May 6, 2013)
• ISSN：1520-510X

文摘

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.