AN APPROACH OF THE STRUCTURE OF ICOSAHEDRAL AL6CULI3 BY MULTIPLE TWINNING OF A RHOMBOHEDRAL CRYSTAL

被引：24

作者：

AUDIER, M

GUYOT, P

机构：

[1] ENSEEG, France

来源：

ACTA METALLURGICA | 1988年 / 36卷 / 05期

关键词：

Aluminum Compounds - Copper Compounds - Crystallography - Crystals--Structure - Lithium Compounds;

D O I：

10.1016/0001-6160(88)90284-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

An analysis of the macroscopic morphology of slowly solidified Al6CuLi3 icosahedral quasicrystals, based on a multiple-twinning of a rhombohedral crystal nucleated on a 20 branded-star seed, is proposed. Consideration of dendrite growth by accretion of polyatomic clusters with icosahedral symmetry gives the key of the R3¯m twinned crystal structure. Its Fourier transform displays a pseudoicosahedral symmetry, with deviations from the perfect one in agreement with certain features of electron and X-rays diffraction patterns experimentally observed, as periodicities, symmetry dependent distortions and splitting of Bragg reflexions.

引用

页码：1321 / 1328

页数：8

共 26 条

[1] A SIMPLE CONSTRUCTION OF THE ALCULI QUASI-CRYSTALLINE STRUCTURE RELATED TO THE (AL,ZN)49MG32 CUBIC STRUCTURE TYPE [J].