Synthesis and Pressure-induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO4  

作　　者：赵鑫光 王凯 颜婷婷 颜岩 邹勃 于吉红 徐如人 

机构地区：[1]State Key Laboratory of lnorganic Synthesis and Preparative Chemistry,College of Chemistry Jilin University,Changchun,Jilin 130012,China [2]State Key Laboratory of Superhard Materials,Jilin University,Changchun,Jilin 130012,China

出　　处：《Chinese Journal of Chemistry》2012年第9期2066-2072,共7页中国化学（英文版）

摘　　要：The crystalline solid europium germanate NaEuGeO4 was prepared under hydrothermal conditions. The in-situ photoluminescence spectroscopic measurement and the synchrotron X-ray diffraction analysis in a diamond anvil cell （DAC） under high pressure were performed to study the pressure-induced phase transition of NaEuGeO4 as well as changes of the luminescent properties of Eu3＋ ions. Photoluminescence spectroscopic studies revealed that a phase transition occurred at a pressure range of 6.5--10 GPa and the high-pressure phase of NaEuGeO4 （NaEu- GeO4-HP） was still stable when the pressure raised up to about 20 GPa. As the pressure was released, the spectra returned to the original state, revealing that the pressure-induced phase transition is a completely reversible process. The synchrotron X-ray diffraction analysis demonstrated that the structure of NaEuGeO4 transformed to an uniden- tified phase NaEuGeO4-HP at a pressure higher than 10 GPa, and the phase transition is reversible. This result is consisted with that obtained by photoluminescence spectra analysis.The crystalline solid europium germanate NaEuGeO4 was prepared under hydrothermal conditions. The in-situ photoluminescence spectroscopic measurement and the synchrotron X-ray diffraction analysis in a diamond anvil cell （DAC） under high pressure were performed to study the pressure-induced phase transition of NaEuGeO4 as well as changes of the luminescent properties of Eu3＋ ions. Photoluminescence spectroscopic studies revealed that a phase transition occurred at a pressure range of 6.5--10 GPa and the high-pressure phase of NaEuGeO4 （NaEu- GeO4-HP） was still stable when the pressure raised up to about 20 GPa. As the pressure was released, the spectra returned to the original state, revealing that the pressure-induced phase transition is a completely reversible process. The synchrotron X-ray diffraction analysis demonstrated that the structure of NaEuGeO4 transformed to an uniden- tified phase NaEuGeO4-HP at a pressure higher than 10 GPa, and the phase transition is reversible. This result is consisted with that obtained by photoluminescence spectra analysis.

关 键 词：LUMINESCENCE high pressure structure phase transition gennanate EUROPIUM 

分 类 号：O614.338[理学—无机化学] TG139.6[理学—化学]