The elastic constants of monoclinic single-crystal chrome-diopside to 1,300 K
The elastic constants of monoclinic single-crystal chrome-diopside to 1,300 K
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DOI：
10.1007/s00269-005-0047-9
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发表时间：
2006
影响因子：
1.4
通讯作者：
D. G. Isaak;I. Ohno;P. Lee
中科院分区：
文献类型：
--
作者：
D. G. Isaak;I. Ohno;P. Lee
Values of the complete adiabatic elastic tensor for single-crystal chrome-diopside (a monoclinic pyroxene mineral) are presented from 298 to 1,300 K. The data were obtained using resonant ultrasound spectroscopy (RUS). They are the first published results for the temperatureTdependences of the 13 individual elastic constantsCijof any clinopyroxene mineral. EachCijis appropriately described by a linear function inTthroughout the range ofT. Values for each (∂Cij/∂T)Pin GPa K−1are as follows:C11, −0.0291;C22, −0.0248;C33, −0.0179;C44, −0.0103;C55, −0.0077;C66, −0.0152;C12, −0.0119;C13, −0.0064;C23, 0.0000;C15, 0.0025;C25, 0.0022;C35, −0.0046; andC46, 0.0026. Values of (∂M/∂T)Pin GPa K−1, whereMrepresents an isotropic bulk property calculated from theCijdata, are as follows: adiabatic bulk modulusKS, −0.0123; isothermal bulk modulusKT, −0.0178; and shear modulusG, −0.00998. Some diopside derivatives, notably (∂KS/∂T)P, (∂KT/∂T)P, and (∂VP/∂T)P, whereVPis the compressional wave velocity, have smaller magnitudes than all other minerals of importance in Earth’s mantle, thus, confirming predictions from systematics studies. We find several dimensionless quantities for this monoclinic mineral have normal values compared to other mantle minerals. Further,αKT(αis the volume coefficient of thermal expansion) for diopside is approximately independent of bothTand volumeVat elevated temperature, so its equation of state is accurately expressed in simplified form.
