珪石煉瓦中のクリストバライトのX線的研究 : 平炉に使用された耐火物に関する研究 (第7報)

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In the silica brick used in open-hearth furnaces exist two species of crystals, i.e., one birefringent found at the surface exposed to the temperatures higher than 1470°C and the other in the lower temperature area.Although it is clear that the former is low cristobalite, but there are some questions whether the latter is high or low cristobalite. It was subjected to X-ray analysis.The diffraction pattern of the crystals collected from the low temperature zone of the brick showed the broadening of lines. From a graph representing β⋅cosθ against sin θ, where β is the half-peak breadth of the line at the Bragg angle θ, it was confirmed that the broading of lines is due to the effects both lattice distortion and small crystal size, and that the apparent isotropic nature of the crystals may be attributed to the aggregate growth of crystallites of low cristobalite whose size is about 800-2700 Å.
社団法人日本セラミックス協会の論文
1959-11-01