Raman and luminescence studies on phase transition of EuNbO_4 under high pressure  

作　　者：侯纪伟 陈桥 郜婵 代如成 张建武 王中平 张增明 丁泽军 

机构地区：[1]Department of Physics University of Science and Technology of China [2]The Centre for Physical Experiments University of Science and Technology of China [3]Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China

出　　处：《Journal of Rare Earths》2014年第9期787-791,共5页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(11074232,11274288,21002097,11304300,11174265);the National Basic Research Program of China(2011CB932801,2009CB939901,2012CB933702);Ministry of Education of China(20123402110034)

摘　　要：Raman and luminescence studies on the phase transition of europium orthoniobates （EuNbO4） under high pressure were performed. The pressure dependent Raman spectra revealed that an irreversible phase transition from monoclinic phase to M＇-fergusonite phase of EuNbO4 occurred at 7.3 GPa, and the two phases coexisted over a pressure range from 7.3 to 13.7 GPa. An obvious discontinuity on luminescence intensity ratio between 5D0 →7F2 and 5D0→7F1 transitions was observed with increasing pressure, in- dicating also that a phase transition occurred at 7.3 GPa, which was in agreement with the high pressure Raman spectra data. Mean- while, the Raman and luminescence spectra in the temperature range of 20--300 K showed the structure stability at low temperatures.Raman and luminescence studies on the phase transition of europium orthoniobates （EuNbO4） under high pressure were performed. The pressure dependent Raman spectra revealed that an irreversible phase transition from monoclinic phase to M＇-fergusonite phase of EuNbO4 occurred at 7.3 GPa, and the two phases coexisted over a pressure range from 7.3 to 13.7 GPa. An obvious discontinuity on luminescence intensity ratio between 5D0 →7F2 and 5D0→7F1 transitions was observed with increasing pressure, in- dicating also that a phase transition occurred at 7.3 GPa, which was in agreement with the high pressure Raman spectra data. Mean- while, the Raman and luminescence spectra in the temperature range of 20--300 K showed the structure stability at low temperatures.

关 键 词：phase transition RAMAN LUMINESCENCE high pressure low temperature rare earths 

分 类 号：O657.37[理学—分析化学]