Chin. Phys. Lett.  2009, Vol. 26 Issue (4): 046301    DOI: 10.1088/0256-307X/26/4/046301
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Raman Investigation of BaWO4-II Phase under Hydrostatic Pressures up to 14.8GPa
TAN Da-Yong1,2, XIAO Wan-Sheng1, ZHOU Wen-Ge3, SONG Mao-Shuang1, XIONG Xiao-Lin1, CHEN Ming1
1Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 5106402Graduate University of Chinese Academy of Sciences, Beijing 1000493Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002
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TAN Da-Yong, XIAO Wan-Sheng, ZHOU Wen-Ge et al  2009 Chin. Phys. Lett. 26 046301
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Abstract The BaWO4-II phase is synthesized at 5.0GPa and 610°C with a cubic-anvil apparatus and identified by XRD. Raman scattering measurement is carried out to investigate the phase behaviour of a pure BaWO4-II phase (space group P21/n, Z=8) under hydrostatic pressures up to 14.8GPa at ambient temperature. In each spectrum recorded for this phase, 27 Raman modes are observed, and all bands shift toward higher wavenumber with a pressure dependence ranging from 3.8 to 0.2cm-1/GPa. No pressure-driven phase transition occurs in the entire pressure range in this study. Our results indicate that the previously reported high pressure phase of BaWO4 at pressure above about 10GPa and room temperature (Errandonea et al. Phys. Rev. B 73(2006)224103) is not the BaWO4-II phase.
Keywords: 63.20.-e      78.30.-j     
Received: 03 November 2008      Published: 25 March 2009
PACS:  63.20.-e (Phonons in crystal lattices)  
  78.30.-j (Infrared and Raman spectra)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/4/046301       OR      https://cpl.iphy.ac.cn/Y2009/V26/I4/046301
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TAN Da-Yong
XIAO Wan-Sheng
ZHOU Wen-Ge
SONG Mao-Shuang
XIONG Xiao-Lin
CHEN Ming
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