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Walstromite-structured CaSiO 3  (Wal) was synthesized at 6 GPa and 1200 °C for 6 h using a cubic press, and its thermal elastic behavior was investigated at T up to 900 °C using a powder X-ray diffraction technique at ambient pressure. Within the investigated T range, all unit-cell parameters, j, of Wal varied almost linearly with T, so that we fitted the data with the equation α j  = j -1 (∂j/∂T) and obtained α a  = 0.92(2) × 10−5/°C, α b  = 1.65(1) × 10−5/°C, α c  = 0.83(1) × 10−5/°C, and α V  = 3.24(3) × 10−5/°C for Wal. The magnitudes of the principal Lagrangian strain coefficients (ε 1 , ε 2 , and ε 3 ) and the orientation of the thermal strain ellipsoids, between ambient T and measured T, were calculated. The orientation of the strain ellipsoid appears constant with T variation, whereas the strain magnitudes vary significantly with T: ε 1  increases, but ε 2  and ε 3  decrease. For T &gt; 900 °C, primitive data were collected for “parawollastonite” (Wo-2M), which led to a much smaller volumetric thermal expansion coefficient than that of Wal.

Thermal elastic behavior of CaSiO 3 -walstromite: A powder X-ray diffraction study up to 900 °C