粉末衍射仪法测定歪长石的晶体结构  

The Determination of Crystal Structure of Anorthoclase by X-ray Powder Diffraction Method

作　　者：西门露露[1] 金泽明 束今赋[3] 

机构地区：[1]复旦大学材料科学研究所 [2]燕山石油化工总公司研究院 [3]中国地质大学(武汉)测试中心

出　　处：《岩石矿物学杂志》1989年第3期268-277,共10页Acta Petrologica et Mineralogica

摘　　要：歪长石的晶体结构多年前已用单晶方法测定过。本文利用粉末衍射仪收集了474个独立的衍射数据,对歪长石的晶体结构进行了修正,偏离因子R=0.114。将粉末法测定的结果与用单晶法测定的结果作了对比。结构的键长、键角基本合理,但测定的精度有待提高。The crystal structure of anorthoclase was determined by the single-crystal method quite a few years ago. In this paper, the intensities of reflection were collected with X-ray powder diffractometer, and 474 independent diffraction data were involved in the calculation, with the finial discrepancy factor R=0.114. The ideal formula for the anorthoclase is (Na, K)AISi_3O_8. It is of triclinic system, with the lattice parameters being α=8.267±0.0025, b=12.954±0.0017, C= 7.149±0.001, α=92°12.2′±1.8′, β=116°20.4′±1.2′, γ=90°12.1′±1′, V=685.4~3, Z=4.A comparison between the result obtained by powder method and that by single-crystel method shows that they are in good agreement with each other and that the bond distance and bond angles are on the whole reasonable. Nevertheless, the accuracy of determination requires further improvement.

关 键 词：长石 晶体结构 粉末法 

分 类 号：P578.968[天文地球—矿物学]