Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites
Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites
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DOI：
10.2138/am.2014.4598
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发表时间：
2014-01-01
影响因子：
3.1
通讯作者：
Hirose, Kei
中科院分区：
文献类型：
--
作者：
Ohta, Kenji;Yagi, Takashi;Hirose, Kei
采用微点加热法测量了MgSiO 3钙钛矿（MgPv）和含2wt%Al2O3的MgSiO 3钙钛矿（Al-MgPv）在室温下的热扩散系数。得到的MgPv和Al-MgPv的热扩散系数值分别为2.6 +/- 0.1和2.4 +/- 0.1 mm（2）/s。MgPv的当前结果远高于先前报道的值1.7 mm（2）/s。在环境条件下，将铝替换成MgPv对其热扩散率几乎没有影响，并且这种杂质效应在对应于地球下地幔的高压和高温下将保持不显著。
Thermal diffusivities of MgSiO3 perovskite (MgPv) and MgSiO3 perovskite containing 2 wt% Al2O3 (Al-MgPv) were measured at ambient conditions using the micro-spot heating angstrom method. The obtained values of thermal diffusivities of MgPv and Al-MgPv are 2.6 +/- 0.1 and 2.4 +/- 0.1 mm(2)/s, respectively. Present result for MgPv is much higher than previously reported value of 1.7 mm(2)/s. Substitution of aluminum into MgPv has little effect on its thermal diffusivity at ambient conditions, and such an impurity effect would remain insignificant at high pressures and high temperatures corresponding to the Earth's lower mantle.