P–V–T equation of state of Ca3Al2Si3O12 grossular garnet
P–V–T equation of state of Ca3Al2Si3O12 grossular garnet
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DOI：
10.1007/s00269-010-0384-1
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发表时间：
2011-02
影响因子：
1.4
通讯作者：
S. Gréaux;Y. Kono;N. Nishiyama;T. Kunimoto;K. Wada;T. Irifune
中科院分区：
文献类型：
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作者：
S. Gréaux;Y. Kono;N. Nishiyama;T. Kunimoto;K. Wada;T. Irifune
使用 Kawai 型多砧压力机和同步辐射，通过能量色散 X 射线衍射在高压和高温下原位检测了合成 Ca3Al2Si3O12钙铝榴石石榴石的热弹性参数。测量在高达 20 GPa 的压力和高达 1,650 K 的温度下进行：此 P,Trange 覆盖了钙铝榴石石榴石的整个高 P、T 稳定性领域。室温数据分析得出 V0,300= 1,664 ± 2 Å3，K0= 166 ± 3 GPa，固定为 4.0。通过高温三阶 Birch-Murnaghan 或 Mie-Grüneisen-Debye 热状态方程拟合我们的 P-V-T 数据，得出热弹性参数： (∂K0,T/∂T)P= −0.019 ± 0.001 GPa K−1 和 α0,T= 2.62 ± 0.23 × 10−5K−1，或 γ0= 1.21，对于固定值 q0= 1.0 和 θ0= 823（Isaak 等人，Phys Chem Min19:106–120, 1992）。通过比较两种不同方法的拟合结果，我们建议将钙铝榴石的体积模量及其压力导数限制为 KT0= 166 GPa 和= 4.03–4.35。目前的结果与先前测定的富含钙铝榴石石榴石的热弹性特性进行了比较。
The thermoelastic parameters of synthetic Ca3Al2Si3O12grossular garnet were examined in situ at high-pressure and high-temperature by energy dispersive X-ray diffraction, using a Kawai-type multi-anvil press apparatus coupled with synchrotron radiation. Measurements have been conducted at pressures up to 20 GPa and temperatures up to 1,650 K: thisP,Trange covered the entire high-P,Tstability field of grossular garnet. The analysis of room temperature data yieldedV0,300= 1,664 ± 2 Å3andK0= 166 ± 3 GPa forfixed to 4.0. Fitting of ourP–V–Tdata by means of the high-temperature third order Birch–Murnaghan or the Mie–Grüneisen–Debye thermal equations of state, gives the thermoelastic parameters: (∂K0,T/∂T)P= −0.019 ± 0.001 GPa K−1andα0,T= 2.62 ± 0.23 × 10−5K−1, orγ0= 1.21 for fixed valuesq0= 1.0 andθ0= 823 (Isaak et al. Phys Chem Min19:106–120, 1992). From the comparison of fits from two different approaches, we propose to constrain the bulk modulus of grossular garnet and its pressure derivative toKT0= 166 GPa and= 4.03–4.35. Present results are compared with previously determined thermoelastic properties of grossular-rich garnets.