High pressure X-ray diffraction study on BaWO4-II |
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| Authors: | Dayong Tan Wei Zhou Ming Chen Wenge Zhou Xiaodong Li |
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| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences , Guangzhou , 510640 , China;2. Institute of Geochemistry, Chinese Academy of Sciences , Guiyang , 550002 , China;3. Institute of High Energy Physics, Chinese Academy of Sciences , Beijing , 100049 , China |
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| Abstract: | BaWO4-II has been synthesized at 5 GPa and 610°C. Its high pressure behavior was studied by in situ synchrotron X-ray diffraction measurements at room temperature up to 17 GPa. BaWO4-II retains its monoclinic structure. Bulk and axial moduli determined by fitting a third-order Birch–Murnaghan equation of state to lattice parameters are: K 0=86.2±1.9 GPa, K 0(a)=56.0±0.9 GPa, K 0(b)=85.3±2.4 GPa, and K 0(c)=146.1±3.2 GPa with a fixed K′=4. Analysis of axial compressible modulus shows that the a-axis is 2.61 times more compressible than the c-axis and 1.71 times more compressible than the b-axis. The beta angle decreases smoothly between room pressure and 17 GPa from 93.78° to 90.90°. |
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| Keywords: | BaWO4-II equation of state synchrotron X-ray diffraction high pressure |
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