Raman and luminescence studies on phase transition of EuNbO4 under high pressure
来源期刊：JOURNAL OF RARE EARTHS2014年第9期
论文作者：侯纪伟 陈桥 郜婵 代如成 张建武 王中平 张增明 丁泽军
文章页码：787 - 791
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, indicating also that a phase transition occurred at 7.3 GPa, which was in agreement with the high pressure Raman spectra data. Meanwhile, the Raman and luminescence spectra in the temperature range of 20–300 K showed the structure stability at low temperatures.
侯纪伟1，陈桥1，郜婵1，代如成2，张建武1，王中平2，张增明2，丁泽军1,3
1. Department of Physics University of Science and Technology of China2. The Centre for Physical Experiments University of Science and Technology of China3. Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China
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, indicating also that a phase transition occurred at 7.3 GPa, which was in agreement with the high pressure Raman spectra data. Meanwhile, the Raman and luminescence spectra in the temperature range of 20–300 K showed the structure stability at low temperatures.
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