Departamento de Física Aplicada-ICMUV, Universidad de Valencia, MALTA Consolider Team, Edificio de Investigación, C/Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
Inorg Chem. 2013 May 6;52(9):5464-9. doi: 10.1021/ic400376g. Epub 2013 Apr 19.
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.
锆石型 PrVO4 和 SmVO4 已通过高压拉曼光谱法研究至 17 GPa。当压力超过 6 GPa 时，检测到相变的发生。这些转变是不可逆的。高压相的拉曼光谱与预期的独居石型相（PrVO4）和白钨矿型相（SmVO4）的拉曼光谱相似。高压相也使用大体积压机合成，并在环境条件下回收。在减压后回收的亚稳产物的 X 射线衍射测量证实了高压相的独居石（PrVO4）和白钨矿（SmVO4）结构。基于报道的新多晶型体的光学性质，提出了稀土钒酸盐的新应用，包括光催化制氢。
