Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO4
Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO4
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DOI：
10.1002/cjoc.201200583
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发表时间：
2012-09
影响因子：
5.4
通讯作者：
Xinguang Zhao;Kai Wang;Tingting Yan;Yan Yan-Yan;Bo Zou;Jihong Yu;Da Xu
中科院分区：
文献类型：
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作者：
Xinguang Zhao;Kai Wang;Tingting Yan;Yan Yan-Yan;Bo Zou;Jihong Yu;Da Xu
在水热条件下合成了结晶固体锗酸铕NaEuGeO 4。采用高压金刚石对顶砧（DAC）原位光致发光谱测量和同步辐射X射线衍射分析，研究了NaEuGeO 4的高压相变以及Eu 3+离子发光性质的变化。光致发光光谱研究表明，在6.5-10 GPa的压力范围内发生了相变，当压力升高到20 GPa左右时，NaEuGeO 4（NaEuGeO 4-HP）的高压相仍然稳定。随着压力的释放，光谱恢复到原始状态，揭示了压力诱导相变是一个完全可逆的过程。同步辐射X射线衍射分析表明，在高于10 GPa的压力下，NaEuGeO 4的结构转变为未知相NaEuGeO 4-HP，且该相变是可逆的。这一结果与光致发光谱分析结果一致。
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 (NaEuGeO4-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 unidentified 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.