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Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO 4
Author(s) -
Zhao Xinguang,
Wang Kai,
Yan Tingting,
Yan Yan,
Zou Bo,
Yu Jihong,
Xu Ruren
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200583
Subject(s) - photoluminescence , germanate , chemistry , europium , phase transition , diamond anvil cell , diffraction , phase (matter) , synchrotron radiation , x ray crystallography , crystallography , synchrotron , analytical chemistry (journal) , luminescence , ion , materials science , optics , condensed matter physics , optoelectronics , organic chemistry , physics
The crystalline solid europium germanate NaEuGeO 4 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 NaEuGeO 4 as well as changes of the luminescent properties of Eu 3+ 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 NaEuGeO 4 (NaEuGeO 4 ‐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 NaEuGeO 4 transformed to an unidentified phase NaEuGeO 4 ‐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.