Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (10): 2383.doi: 10.7503/cjcu20130138

• Physical Chemistry • Previous Articles     Next Articles

In-situ Raman Spectra and X-ray Diffraction Study on Pressure-induced Phase Transition in Columbite ZnNb2O6

ZHOU Jing1, LI Liang1, HUANG Feng-Xian1, SHEN Hong-Zhi2, YANG Hang2, ZHOU Qiang1,2, WANG Wen-Quan2, XU Da-Peng1,2   

  1. 1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
    2. College of Physics, Jilin University, Changchun 130012, China
  • Received:2013-02-06 Online:2013-10-10 Published:2013-10-10

Abstract:

In-situ high pressure studies of ZnNb2O6 have been performed using Raman spectroscopy and synchrotron X-ray diffraction in a diamond anvil cell up to 29 GPa. Raman experiments show that most Raman peaks decrease in intensity and shift toward high wavenumbers with increasing pressure. Three turn points in the slope of frequency-pressure curve of Raman modes turn up at the pressure around 10, 16 and 20 GPa. Angle dispersive X-ray diffraction results display that some old peaks disappear and some new peaks appear above 10.6 GPa. Both Raman and X-ray diffraction data provide evidence of a reversible phase transition which begins from about 10 GPa and complets at 16 GPa, and then a disorder state is formed above 20 GPa.

Key words: Columbite, High-pressure, In-situ Raman spectrum, X-ray diffraction, Phase transition

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