CRYSTAL-CHEMISTRY OF IRON CONTAINING GERMANIUM ANDALUSITES, FEXAL8-XGE4O20

被引：3

作者：

FISCHER, RX ^{[1
]}

SCHNEIDER, H ^{[1
]}

机构：

[1] DEUTSCH FORSCH ANSTALT LUFT & RAUMFAHRT EV,INST WERKSTOFF FORSCH,POSTFACH 906058,W-5000 COLOGNE 90,GERMANY

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 1992年 / 201卷 / 1-2期

关键词：

ANDALUSITE; CRYSTAL STRUCTURE; RIETVELD ANALYSIS; ALUMINUM-IRON SUBSTITUTION;

D O I：

10.1524/zkri.1992.201.1-2.19

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Five iron containing germanium andalusites have been synthesized from homogeneous mixtures of Al2O3, GeO2 and Fe2O3 powders. The andalusite-type germanate FexAl8-xGe4O20 is formed in the composition range 2.6 less-than-or-equal-to x less-than-or-equal-to 5.6, corresponding to Fe2O3 weight fractions from 23.9 to 45.5%, respectively. The phases crystallize in the orthorhombic space group Pnnm with lattice constants a ranging from 8.0223(1) angstrom to 8.1490(2) angstrom, b from 8.1546(1) angstrom to 8.2654(2) angstrom, and c from 5.7620(1) angstrom to 5.8606(1) angstrom, with Z = 1. Rietveld analyses based on X-ray powder diffraction data showed, that the iron atoms are distributed statistically over the octahedrally coordinated M1 site and the five-coordinated M2 position. Microprobe and structure analyses give evidence for the occurrence of partial vacancies in cation and oxygen sites in all samples.

引用

页码：19 / 36

页数：18

共 14 条

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