X-ray powder diffraction study of CaTiO3 perovskite at high temperatures
X-ray powder diffraction study of CaTiO3 perovskite at high temperatures
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DOI：
10.1007/bf00200119
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发表时间：
1993-08
影响因子：
1.4
通讯作者：
Xing Liu;R. Liebermann
中科院分区：
文献类型：
--
作者：
Xing Liu;R. Liebermann
通过粉末 X 射线衍射研究了高温和 P= 1 bar 下的 CaTiO3 钙钛矿，并随后通过 Rietveld 方法精修了其结构。这种Pbnm钙钛矿显示出随着温度升高，正交晶格畸变减少，如八面体间角向180°增加所表明的那样。 CaTiO3 观察到线性热膨胀至 1373 K；这些数据的外推表明，在 1600 K 附近可能转变为四方相或伪四方相。
CaTiO3perovskite has been studied at high temperature andP= 1 bar by powder x-ray diffraction and its structure refined subsequently by the Rietveld method. ThisPbnmperovskite shows a decrease of orthorhombic distortion with increasing temperature as manifested by the increasing of the inter-octahedral angles towards 180°. Linear thermal expansion is observed for CaTiO3to 1373 K; extrapolation of these data suggest a possible transition to a tetragonal or pseudo-tetragonal phase near 1600 K.