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摘要: 利用金刚石压腔同步辐射X射线就位衍射技术,在室温、最高压力达13 GPa条件下,对采自云南个旧锡矿的天然锡石做了X衍射测量。结果表明,在实验压力范围内锡石未发生相变,其晶胞参数随压力增大而逐渐减小。与前人合成锡石实验结果相比,本次实验测定的晶胞参数偏大。由Birch状态方程对实验结果p-V进行最小二乘法拟合,得出锡石的KT(0)=228 GPa。分析认为,在天然矿物晶体中,Zr对Sn的类质同象置换是晶胞参数偏大的主要原因。Abstract: At room temperature and up to 13 GPa, in situ energy dispersive X-ray diffraction measurements for a natural cassiterite, collected from Gejiu tin deposits, Yunnan, were performed by using diamond anvil cell instrument with synchrotron radiation at BSRF. The results show that cassiterite is stable up to 13 GPa and its parameters of unit-cell decrease with increasing pressure. On the other hand, the parameters of unit-cell we calculated are bigger than these of former experiments with synthetical cassiterite. According to Birch equation of state, KT(0)=228 GPa. For natural cassiterite crystal, it is believed that Zr replacing to Sn may be the reason for expansion of unit-cell.
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Key words:
- cassiterite /
- synchrotron X-ray diffraction /
- parameter of unit-cell /
- equation of state /
- isomorphism
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Dubrovinsky L S, Dubrovinskaia N A, Swamy V, et al. The Hardest Known Oxide[J]. Nature, 2001, 410: 653-654. Swamy V, Dubrovinskaia N A, Dubrovinsky L S. Compressibility of Baddeleyite-Type TiO2 from Static Compression to 40 GPa [J]. J Alloys Compd, 2002, 340: 46-48. Desgreniers S, Lagarec K. High-Density ZrO2 and HfO2: Crystalline Structures and Equations of State [J]. Phys Rev B, 1999, 59: 8467-8472. Lowther J E, Dewhurst J K, Leger J M, et al. Relative Stability of ZrO2 and HfO2 Structural Phase [J]. Phys Rev B, 1999, 60: 14485-14487. Mammone J F, Nicol M. Raman Spectra of TiO2-Ⅱ, TiO2-Ⅲ, SnO2, and GeO2 at High Pressure [J]. J Phys Chem Solids, 1981, 42: 379-384. Hazen R M, Finger L W. Bulk Moduli and High-Pressure Crystal Structures of Rutile-Type Compounds [J]. J Phys Chem Solids, 1981, 42: 143-151. Liebermann R C. Elastic Properties of Polycrystalline SnO2 and GeO2: Comparison with Stishovite and Rutile Data [J]. Phys Earth Planet In, 1973, 7: 461-465. Jiang J Z, Gerward L, Olsen J S. Pressure Induced Phase Transformation in Nanocrystal SnO2 [J]. Scripta Mater, 2001, 44: 1983-1986. Pang Z L. Crystallography and Mineralogy(3rd ed), Part Ⅱ [M]. Beijing: Geology Press, 1993. 60-65. (in Chinese) 潘兆橹. 结晶学及矿物学(第三版), 下册 [M]. 北京: 地质出版社, 1993. 60-65. Shi J X. Cassiterite Typomorphic Characteristic of Chinese Tin Deposits [J]. Yunnan Geological Science and Technology Information, 1990, 1: 1-35. (in Chinese) 施加辛. 中国锡矿床的锡石标型特征 [J]. 云南地质科技情报, 1990, 1: 1-35. Gaillard-Allemand B, Podor R, Vilasi M. Experimental Study of the SnO2-ZrO2 Phase Diagram [J]. J Eur Ceram Soc, 2002, 22: 2297-2303. Liu J, Zhao J, Che R Z, et al. In Situ Energy Dispersive Diffraction under High Pressure Using Synchrotron Radiation [J]. Chinese Journal of High Pressure Physics, 2000, 14(4): 247-252. (in Chinese) 刘景, 赵菁, 车荣钲, 等. 高压下的同步辐射能量色散粉末衍射 [J]. 高压物理学报, 2000, 14(4): 247-252. Birch F. Equation of State and Thermodynamic Parameters of NaCl to 300 kbar in the High-Temperature Domain [J]. J Geophys Res, 1986, 91(B5): 4949-4954. Holland T J B, Redfern S A T. Unit Cell Refinement from Powder Diffraction Data: The Use of Regression Diagnostics [J]. Mineral Mag, 1997, 61: 65-77. Xie H S. Introduction to the Physical Science in the Earth's Interior [M]. Beijing: Science Press, 1997. 92-104. (in Chines) 谢鸿森. 地球深部物质科学导论 [M]. 北京: 科学出版社, 1997. 92-104. Peng Z Z. Concise X-Ray Analysis [M]. Beijing: Geology Press, 1982. 10-13. (in Chinese) 彭志忠. X射线分析简明教程 [M]. 北京: 地质出版社, 1982. 10-13.
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