• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Contributions to Mineralogy and Petrology >Crystal structure, thermal expansivity, and elasticity of OH-chondrodite: trends among dense hydrous magnesium silicates
【24h】

Crystal structure, thermal expansivity, and elasticity of OH-chondrodite: trends among dense hydrous magnesium silicates

机译：OH-长方晶石的晶体结构，热膨胀性和弹性：致密含水硅酸镁的趋势

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report the structure and thermoelastic properties of OH-chondrodite. The sample was synthesized at 12 GPa and 1523 K, coexisting with hydroxyl-clinohumite and hydrous olivine. The Fe content Fe/(Fe + Mg) is 1.1 mol%, and the monoclinic unit-cell parameters are as follows: a = 4.7459(2) angstrom, b = 10.3480(7) angstrom, c = 7.9002(6) angstrom, alpha = 108.702(7)degrees, and V = 367.50(4) angstrom(3). At ambient conditions, the crystal structure was refined in space group P2(1)(/b) from 1915 unique reflection intensities measured by single-crystal X-ray diffraction. The volume thermal expansion coefficient was measured between 150 and 800 K, resulting in alpha(V) = 2.8(5) x 10(-9) (K-2) x T + 40.9(7) x 10(-6) (K-1) - 0.81(3) (K)/T-2, with an average value of 38.0(9) x 10(-6) (K-1). Brillouin spectroscopy was used to measure a set of acoustic velocities from which all 13 components (C-ij) of the elastic tensor were determined. The Voigt-Reuss-Hill average of the moduli yields for the adiabatic bulk modulus, K-S0 = 117.9(12) GPa, and for shear modulus, G(0) = 70.1(5) GPa. The Reuss bound on the isothermal bulk modulus (K-T0) is 114.2(14) GPa. From the measured thermodynamic properties, the Gruneisen parameter (gamma) is calculated to be 1.66(4). Fitting previous static compression data using our independently measured bulk modulus (isothermal Reuss bound) as a fixed parameter, we refined the first pressure derivative of the bulk modulus, K-T' = 5.5(1). Systematic trends between H2O content and physical properties are evaluated among dense hydrous magnesium silicate phases along the forsterite-brucite join.
机译：我们报告了OH-长方晶石的结构和热弹性。样品是在12 GPa和1523 K下合成的，与羟基亚硫酸盐和含水橄榄石共存。 Fe含量Fe /（Fe + Mg）为1.1 mol％，单斜晶胞参数如下：a = 4.7459（2）埃，b = 10.3480（7）埃，c = 7.9002（6）埃， alpha = 108.702（7）度，V = 367.50（4）埃（3）。在环境条件下，从1915年通过单晶X射线衍射测得的独特反射强度，在空间群P2（1）（/ b）中细化了晶体结构。测得的体积热膨胀系数在150至800 K之间，得出alpha（V）= 2.8（5）x 10（-9）（K-2）x T + 40.9（7）x 10（-6）（K -1）-0.81（3）（K）/ T-2，平均值为38.0（9）x 10（-6）（K-1）。布里渊光谱法用于测量一组声速，由此确定弹性张量的所有13个分量（C-ij）。绝热体积模量K-S0 = 117.9（12）GPa，模量G（0）= 70.1（5）GPa的模量的Voigt-Reuss-Hill平均值。等温体积模量（K-T0）的Reuss界限为114.2（14）GPa。根据测得的热力学性质，Gruneisen参数（γ）计算为1.66（4）。使用我们独立测量的体积模量（等温鲁斯约束）作为固定参数拟合先前的静态压缩数据，我们细化了体积模量的一阶压力导数K-T'= 5.5（1）。沿镁橄榄石-微晶石接合处的致密含水硅酸镁相中，H2O含量与物理性质之间的系统趋势得到了评估。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号