RHOMBOHEDRAL TWIN STRUCTURE IN HEMATITE (ALPHA-FE2O3)

被引：21

作者：

BURSILL, LA

PENG, JL

FAN, XD

机构：

[1] The University of Melbourne, Parkville

来源：

AUSTRALIAN JOURNAL OF CHEMISTRY | 1992年 / 45卷 / 09期

关键词：

D O I：

10.1071/CH9921527

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Electron optical imaging of the structure of haematite (alpha-Fe2O3) in two projections has allowed the microscopic twinning elements of rhombohedral twins to be determined. A systematic analysis of alternative structural models, using computer-simulation and image-matching considerations, as well as crystallochemical arguments, is presented. The twin has a screw operation consisting of a pure rotation of 180-degrees about [0111BAR], the twinning direction, combined with a parallel translation of (1/22) [0111BAR]. The twinning plane (0112BAR) forms a coherent interface, consisting of face- and edge-shared octahedra, with no change in the normal nearest-neighbour coordination.

引用

页码：1527 / 1546

页数：20

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