Thermal expansion of single-crystal forsterite to 1023 K by Fizeau interferometry
Thermal expansion of single-crystal forsterite to 1023 K by Fizeau interferometry
复制标题
通过斐索干涉测量单晶镁橄榄石热膨胀至 1023 K
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
M. Manghnani
中科院分区：
文献类型：
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作者：
T. Matsui;M. Manghnani
利用菲索干涉测量技术，测量了单晶forsterite （Mg2SiO4）在加热和冷却循环过程中沿三个轴向的线性热膨胀系数。总的来说，目前的数据与以前报道的数据在量级上是一致的（在1%到2%之间），但分散性较小。在分析数据时，我们使用了格拉<s:1>尼森统计力学方法。应用最小二乘法对两种情况下的热参数（φ, Q0， k和a）进行了计算。在较宽温度范围内的膨胀系数是通过使用溶液2的参数（即，通过固定的解决方案）来推断的。与之前的发现相反，我们的结果表明，对于forsterite， grisen参数随着温度的升高而降低，这意味着它的行为与Fe2SiO4和镁方石（MgO）没有太大的不同。
Using a Fizeau interferometry technique, we have measured the coefficients of linear thermal expansion of single-crystal forsterite (Mg2SiO4) along three axial directions to 1023 K during heating and cooling cycles. Overall, the present data are consistent in magnitude (within 1 to 2%) with those previously reported but have less scatter. We used the Grüneisen statistical mechanical approach in analzying the data. The least-squares method was applied to evaluate thermal parameters (ϑ, Q0, k and a) in two cases. The expansion coefficients in wider temperature ranges were extrapolated by using the parameters of solution 2 (i.e., solution by fixing ϑ and k). In contrast to earlier findings, our results show that for forsterite the Grüneisen parameter decreases with temperature, implying that it does not behave too differently from fayalite (Fe2SiO4) and periclase (MgO).