Abstract
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, Q 0, 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).
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Hawaii Institute of Geophysics Contribution No. 1608
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Matsui, T., Manghnani, M.H. Thermal expansion of single-crystal forsterite to 1023 K by Fizeau interferometry. Phys Chem Minerals 12, 201–210 (1985). https://doi.org/10.1007/BF00311289
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DOI: https://doi.org/10.1007/BF00311289