High-Pressure Stability and Compressibility of Zircon-Type YV1鈥?i>xPxO4:Eu3+ Solid-Solution Nanoparticles: An X-ray Diffraction and Raman Spectro

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• 作者：Hongsheng Yuan ; Kai Wang ; Shourui Li ; Xiao Tan ; Qian Li ; Tingting Yan ; Ke Yang ; Jing Liu ; Bingbing Liu ; Guangtian Zou ; Bo Zou
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：117
• 期：36
• 页码：18603-18612
• 全文大小：708K
• 年卷期：v.117,no.36(September 12, 2013)
• ISSN：1932-7455

文摘

We probed the high-pressure response of the YV_1鈥?i>xP_xO₄:Eu³⁺ (x = 0, 0.5, 0.7, 1.0) solid-solution nanoparticles using angular dispersive synchrotron X-ray diffraction (XRD) and Raman techniques at room temperature. In situ diffraction results showed that the overall nanoparticles underwent an irreversible zircon-to-scheelite structural transformation. The transition pressures were 9.3, 12.1, 14, and 18.4 GPa for the YV_1鈥?i>xP_xO₄:Eu³⁺ (x = 0, 0.5, 0.7, 1.0) samples, respectively. Coupled with the zircon-to-scheelite transition features, it was proposed that the transition pressure was probably governed by the stiffness of VO₄/PO₄ units in the solid solutions. This claim was verified by further Raman measurements, which revealed that the stiffness of VO₄/PO₄ units was enhanced with increasing P contents. The structural refinements showed that the samples with comparable particle size (20鈥?0 nm) became less compressible with increasing P content (x = 0 鈫?0.7 鈫?1.0). However, the compressibility of the YV_0.5P_0.5O₄:Eu³⁺ sample with smaller particle size (10鈥?0 nm) was similar to that of the YV_0.3P_0.7O₄:Eu³⁺ sample. The general compressibility behavior as a function of P content was ascribed to the special packing style related to the stiffness of VO₄/PO₄ tetrahedra in zircon structure, and the higher surface energy contribution was responsible for the exceptional compressibility in the smaller nanoparticles.