Accurate and rapid measurements of thermodynamic properties of minerals by microcalorimetric method.

采用微量热法准确快速测量矿物的热力学性质。

基本信息

批准号：
60840023
负责人：
AKAOGI Masaki
金额：
$ 2.94万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60840023/
关键词：
Calorimetry Heat capacity Enthalpy High pressure mineral Rapid measurement Accurate measurement 迅速測定

项目摘要

1. Heat capacities of high-pressure silicate minerals were measured by the differencial scanning calorimeter which was installed by the grant-in-aid for scientific research. The data processing system using the personal computor was made for rapid and accurate calculation of the heat capacity measured by the differencial scanning calorimeter. Garnet solid solutions containing pyroxene components are stable in the pressure-temperature conditions in the mantle transition zone. Heat capacities of the garnet solid solutions in the system <Mg_4> <Si_4> <O_(12)> - <Mg_3> <Al_2> <Si_3> <O_(12)> , which represent the garnets in the transition zone, were measured by the present heat capacity measurement system. It was observed that heat capacity of the garnet solid solution at each temperature changed very little with increasing <Mg_4> <Si_4> <O_(12)> component. The Gruneisen parameter and Debye temperature of the garnet solid solutions were estimated from the heat capacity data.2. Enthalpies of silicates and germanates stable at high pressures were measured. Enthalpies of transition of the silicates and germanates were obtained for the following systems:(1) rhodonite-clinopyroxene-garnet transitions in MnSi <O_3> , (2) wollastonite-garnet-perovskite transitions in CaGe <O_3> , (3) pyroxenoid-garnet-ilmenite-perovskite transitions in CdGe <O_3> , (4) pyroxene-garnet transition in the system <Mg_4> <Si_4> <O_(12)> - <Mg_3> <Al_2> <Si_3> <O_(12)> .Phase boundaries for the above transitions were calculated from the measured enthalpies.They were almost consistent with the boundaries determined by the phase equilibrium experiments. It was established that the pyroxene(or pyroxenoid)- garnet transitions have generally gentle positive dP/dT slopes, while the ilmenite (or garnet)-perovskite transitions have negative slopes.

1。高压硅酸盐矿物质的热容量是通过拨款中安装的差异扫描量热仪来测量的。使用个人计算机的数据处理系统是为了快速准确地计算通过差异量热仪测量的热容量。在地幔过渡区的压力温度条件下，含有辉石成分的石榴石固体溶液是稳定的。 Heat capacities of the garnet solid solutions in the system <Mg_4> <Si_4> <O_(12)> - <Mg_3> <Al_2> <Si_3> <O_(12)> , which represent the garnets in the transition zone, were measured by the present heat capacity measurement system.观察到，随着<mg_4> <si_4> <o_（12）>组件的增加，在每个温度下，石榴石固体溶液的热容量都发生了很小的变化。从热容量数据中估算了石榴石固体溶液的Gruneisen参数和Debye温度。2。测量了在高压下的硅酸盐和德国人稳定的焓。在以下系统中获得了硅酸盐和德国人过渡的焓：（1）Mnsi <o_3>中的犀牛 - 磷酸 - 磷酸化生成型过渡，（2）Wollastonite-garnet-garnet-garnet-garnet-garnet-perovskites cage <o_3>中的cage <o_3>，（3）pyroxenet-garroxenet-garroxenet-garnet-garnet-ferovs in Cdyroxenet-garnet-ferovs InckkkkkkkeN-fermeMenet-ferovskkkken-ilmenet-ferovs in <o_3>，（4）系统中的辉石 - 加热网过渡<mg_4> <si_4> <o_4> <o_（12）> - <mg_3> <mg_3> <mg_2> <Al_2> <si_3> <si_3> <si_3> <o_（12）>.。从上述过渡的相位边界，从测量的范围中计算出一致的范围。已经确定辉石（或辉石） - 石榴石转变通常具有柔和的阳性dp/dt斜率，而iLmenite（或石榴石） - 栖息地 - 栖息地转变具有负斜率。