3 years ago

Pressure and Temperature Study on the Structural Stability of GdNbO4:Eu3+

Pressure and Temperature Study on the Structural Stability of GdNbO4:Eu3+
Zhongping Wang, Zengming Zhang, Zejun Ding, Jianwu Zhang, Ru Zhou, Jiwei Hou
Lanthanide niobate is an excellent nonlinear optical and high dielectric constant material. However, development and application of these novel properties depend on an understanding of its structural stability. In this work, Raman and luminescence spectra of GdNbO4 with different Eu3+ ions doping concentrations under high pressure and low temperature were obtained. The evolution of Raman spectra indicated that an irreversible structural phase transition of GdNbO4 from monoclinic phase to M′-fergusonite phase occurred at 6.2 GPa, and the phase transition was completed at about 13.1 GPa. An obvious discontinuity on Eu3+ ions luminescence intensity ratio between the 5D07F2 and the 5D07F1 transition lines was observed with increasing pressure. The results indicated that the site symmetry of Eu3+ ions in GdNbO4:Eu3+ was changed, which was in agreement with high-pressure Raman spectra data. Meanwhile, Raman and luminescence spectra showed that the crystal structure remained stable in the temperature range of 20–300 K.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b02475

DOI: 10.1021/acs.jpcc.7b02475

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