We probed the high-pressure response of the YV1-xPxO4: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 similar to 9.3, similar to 12.1, similar to 14, and similar to 18.4 GPa for the YV1-xPxO4: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 (20-90 nm) became less compressible with increasing P. content (x 0 -> 0.7 -> 1.0). However, the compressibility of the YV1-xPxO4:Eu3+ sample with smaller particle size (10-30 nm) was similar to that of the YV1-xPxO4: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.
Yuan, HS,Wang, K,Li, SR,et al. High-Pressure Stability and Compressibility of Zircon-Type YV1-xPxO4:Eu3+ Solid-Solution Nanoparticles: An X-ray Diffraction and Raman Spectroscopy Study[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2013,117(36):18603-18612.
Yuan, HS.,Wang, K.,Li, SR.,Tan, X.,Li, Q.,...&Zou, B；刘景.(2013).High-Pressure Stability and Compressibility of Zircon-Type YV1-xPxO4:Eu3+ Solid-Solution Nanoparticles: An X-ray Diffraction and Raman Spectroscopy Study.JOURNAL OF PHYSICAL CHEMISTRY C,117(36),18603-18612.
Yuan, HS,et al."High-Pressure Stability and Compressibility of Zircon-Type YV1-xPxO4:Eu3+ Solid-Solution Nanoparticles: An X-ray Diffraction and Raman Spectroscopy Study".JOURNAL OF PHYSICAL CHEMISTRY C 117.36(2013):18603-18612.