Disproportionation of MgAl2O4 spinel at high pressures and temperatures
Disproportionation of MgAl2O4 spinel at high pressures and temperatures
复制标题
MgAl2O4尖晶石在高压高温下的歧化反应
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
Lin‐gun Liu
中科院分区：
文献类型：
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作者：
Lin‐gun Liu
合成尖晶石（MgAl2O4）已被发现在约180 kbar的加载压力和1000至1400°C之间不成比例地变成其组分氧化物、方镁石和尖晶石的混合物。将多晶粉末样品在金刚石压砧单元中压缩并通过连续YAG激光器加热。由于在局部和快速加热过程中压力的瞬时增加，准确的过渡压力是未知的。根据MgAl_2O_4、MgO和Al_2O_3的热化学数据和压缩曲线，计算出相界为P（kbar）=（137±8）+0.009T（°C）。
Synthetic spinel (MgAl2O4) has been found to disproportionate into a mixture of its component oxides, periclase and corundum, at a loading pressure of about 180 kbar and between 1000 and 1400°C. The polycrystalline powder sample was compressed in a diamond-anvil cell and heated by a continuous YAG laser. The exact transition pressure is not known due to transient increases in pressure during the local and rapid heating process. The phase boundary, however, has been calculated to be P(kbar) = (137±8) + 0.009T(°C) on the basis of the available thermochemical data and compression curves for MgAl2O4, MgO, and Al2O3.