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High-Pressure Phase Transition in BaSO4-SrSO4 Series

High-Pressure Phase Transition in BaSO4-SrSO4 Series

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18th International Conference on High Pressure Science and Technology

作者： Eugene Huang Pei-Lun Lee and Shu-Cheng YuInstitute of Earth Sciences Academia Sinica Taipei chinadept. recreational resources Technology Institute Tainan Taiwan ChinaDepartment of Earth Sciences National Cheng-Kung University Taiwan China.

＜正＞High-pressure study on sulfates is important because sulfates have analogous structure as olivine that is considered as one of the most dominant mineral in the Earth’s upper mantle. It is comprehensible that high-pressure study on the distortion of SO4 tetrahedron and the lattice stability of sulfates may have direct implications on the more rigid iso-structural silicates. High-pressure Raman spectroscopy and X-ray diffraction experiments of BaSO4- SrSO4 series were conducted up to 25 GPa at room temperature. Synthetic crystals of BaSO4, （Ba.75,Sr25）SO4, （Ba.50,Sr.5o）SO4, （Ba.8o,Sr.2o）SO4 and SrSO4 were ground into powder to an average grain size of 2 u m and were used as the starting materials. The Raman spectroscopic measurements were carried out at the Institute of Earth Sciences, Academia Sinica using the Renishaw 2000 Raman spectroscopy. The X-ray diffraction experiment was carried out at Cornell High Energy Synchrotron Source （CHESS） using the white radiation from the Bl beam line. Ruby fluorescence method was used for pressure measurement in the Raman study and gold was used for pressure calibrant in the X-ray study. Figure 1 shows the Raman spectroscopic results in this study. The most intense mode of the sulfates, 3, which represents the S-O stretching motion of the SO4 tetrahedron displays a kink in the slope in the wavenumber-versus- pressure plot for each composition. Structural identification by the X-ray study supports that a reversible first-order phase transformation has taken place in the BaSO4-SrSO4 series. For instance, the transition pressure is at 10 GPa for BaSO4. This result is consistent with that reported by Lee et al. [1]. The transition pressure increases progressively with trie Sr-content in the series. The compression data yield a bulk modulus of 63±2 GPa for barite and this value increases with the content of Sr. These observations are consistent with Pauling’s rules that compounds with larger size of

关键词： phase transition anisotropy bond strength

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