POLYMORPHS OF RARE-EARTH PYROSILICATES RE2SI2O7[RE-LA CE PR ND SM]

被引：52

作者：

FELSCHE, J

HIRSIGER, W

机构：

[1] Institut für Kristallographie und Petrographie der ETH, Zürich

来源：

JOURNAL OF THE LESS-COMMON METALS | 1969年 / 18卷 / 02期

关键词：

D O I：

10.1016/0022-5088(69)90132-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The low- and high-temperature forms of the isostructural pyrosilicate compounds are described in terms of single crystal- and powder X-ray data. The low-temperature form is tetragonal, space group P41, or P4122. Crystals of the high-temperature form show orthorhombic symmetry, possible space group Pna21, or Pnma. Cell dimensions and indexed d-spacings of all compounds are given. The polymorphs are isostructural with the α-and β-form of the pyrophosphates M2P2O7, [M = Ca, Sr, (Ba)]. © 1969.

引用

页码：131 / &

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