In situ X-ray diffraction patterns of the powder hematite polymorphs were recorded in a temperature range from room temperature (RT) to 1 000℃ in static air and vacuum. Lattice parameters for hematite (RT~1 000℃) in static air and vacuum were refined. The variations of lattice parameters of hematite with temperature were therefore well described. Linear (α) and volume (β) thermal expansion coefficients of hematite (RT~1 000℃) were calculated. The change laws of α and β with temperature for hematite in static air and vacuum were summarized. It is shown that linear (α) and volume (β) thermal expansion coefficients of hematite (RT~1 000℃) are constant with increasing temperature. The thermal expansion coefficients for hematite are αa=9.603 16×10-6/℃, αc=6.647 67×10-6/℃, β=2.606 33/℃ in static air and αa=9.006 79×10-6/℃, αc=6.891 23×10-6/℃, and β=2.511 51/℃ in vacuum.
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张楠,王河锦,王冠玉, 2017. 赤铁矿高温原位X射线衍射研究[J]. 岩石矿物学杂志, 36(1):89~95. ZHANG Nan, WANG He-Jin, WANG Guan-Yu, 2017. In situ high temperature X-ray diffraction study of hematite[J]. Acta Petrologica et Mineralogica, 36(1): 89~95.
