Compressibility of pyrochlore-type MgZrSi2O7 determined by in situ X-ray diffraction in a large-volume high pressure appa ratus
Compressibility of pyrochlore-type MgZrSi2O7 determined by in situ X-ray diffraction in a large-volume high pressure appa ratus
复制标题
大容量高压装置中原位 X 射线衍射测定烧绿石型 MgZrSi2O7 的压缩性
DOI：
10.1080/08957959.2012.750653
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发表时间：
2013
影响因子：
2
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
S. Zhai;et al.
采用同步能量色散x射线衍射法，在多顶锤高压装置中，在室温下测量了高达24.3 GPa的焦绿石型mgzrsi2o7。使用内部金金属压力校准器计算压力。本研究未观察到相变。采用三阶Birch-Murnaghan状态方程拟合压力-体积数据。拟合得到体积v0 =802.8±0.2 Å3，等温体积模量kt =249±12 GPa，一阶压力导数k t =3.2±1.3。将k′s固定为4，则KTis为241.8±2.6 GPa。与锆酸盐或钛酸盐型焦绿石相比，mgzrsi2o7由于阳离子半径比（rMg,Zr/rSi）较大而表现出较小的可压缩性。
The pyrochlore-type MgZrSi2O7has been investigated byin situsynchrotron energy-dispersive X-ray diffraction measurements up 24.3 GPa at room temperature in a multianvil high pressure apparatus. The pressure has been calculated using an internal gold metal pressure calibrant. No phase transformation was observed in this study. A third-order Birch–Murnaghan equation of state was used to fit the pressure–volume data. The fitting gives a volume ofV0=802.8±0.2 Å3, an isothermal bulk modulus ofKT=249±12 GPa, and first pressure derivative ofK′T=3.2±1.3. IfK′Tis fixed as 4,KTis obtained as 241.8±2.6 GPa. Compared with zirconate or titanate pyrochlores, MgZrSi2O7shows a smaller compressibility due to a larger cation radii ratio (rMg,Zr/rSi).