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arXiv 0905.1206cond-mat.mtrl-sciphysics.geo-ph
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几种锆型原钒酸盐的高压结构研究

High-pressure structural investigation of several zircon-type orthovanadates

D. Errandonea, R. Lacomba-Perales, J. Ruiz-Fuertes, A. Segura, S. N. Achary, A. K. Tyagi

摘要:

室温角色散X射线衍射测量锆型EuVO 4,LuVO 4,和ScVO 4进行了高达27 GPa。在这三种化合物中,我们发现了压力引起的结构相变的证据,从锆石到白钨矿型结构。转变的开始是在8 GPa附近,但是转变是缓慢的,并且在大约10 GPa的压力范围内低压和高压相共存。在EuVO 4和LuVO 4的第二个过渡到M-fergusonite型相被发现接近21 GPa。还确定了锆石和白钨矿相的状态方程。在这三种化合物中,我们发现ScVO 4的可压缩性低于EuVO 4和LuVO 4,是迄今为止研究的最不可压缩的原钒酸盐。与其他锆石型氧化物相比,结构转变和压缩的顺序进行了讨论。

英文摘要:

Room temperature angle-dispersive x-ray diffraction measurements on zircon-type EuVO4, LuVO4, and ScVO4 were performed up to 27 GPa. In the three compounds we found evidence of a pressure-induced structural phase transformation from zircon to a scheelite-type structure. The onset of the transition is near 8 GPa, but the transition is sluggish and the low- and high-pressure phases coexist in a pressure range of about 10 GPa. In EuVO4 and LuVO4 a second transition to a M-fergusonite-type phase was found near 21 GPa. The equations of state for the zircon and scheelite phases are also determined. Among the three studied compounds, we found that ScVO4 is less compressible than EuVO4 and LuVO4, being the most incompressible orthovanadate studied to date. The sequence of structural transitions and compressibilities are discussed in comparison with other zircon-type oxides.

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