An updated model of Rietveld structure refinement of Na/K-feldspar

doi:10.2451/2017PM684

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	An updated model of Rietveld structure refinement of Na/K-feldspar
	Liu, Shanke; Li, Jiaju; Liu, Jianming
刊名	PERIODICO DI MINERALOGIA
	2017-04-01
卷号	86 期号:1 页码:75-85
关键词	alkali feldspar crystal structure Rietveld refinement X-ray powder diffraction
ISSN号	0369-8963
DOI	10.2451/2017PM684
文献子类	Article
英文摘要	Alkali feldspar is highly abundant on earth, and studies of its structure are very important in geology. When a single crystal is unavailable for alkali feldspar in some cases, X-ray powder diffraction (XRPD) is essential. However, some problems on extracting high quality structural data of Na/K feldspar from XRPD exist, such as deviation of Al/Si-O bond length from expected value, difficulty in identifying Al and Si elements with similar scattering power because of their same crystallographic site, and severe overlapping of diffraction peaks caused by a low symmetry of crystal structure. To extract high-quality structural data, two equations related to Si/Al-O bond length and Si/Al occupancy in terms of the crystal structure database were respectively calculated for albite and microcline. A better model was established by tactically combining the two equations and soft distance constraints for Al/Si-O bond lengths. Application of the updated model successfully obtained high-quality structural data from two different samples using Bragg-Brentano XRPD via the Rietveld method with the general structure analysis system. The reliability of these structural data for low-symmetry albite and microcline was discussed by comparing the data with the results of previous studies.
WOS关键词	RAY-POWDER DIFFRACTION ; CRYSTAL-STRUCTURES ; HIGH ALBITE ; X-RAY ; THERMAL-EXPANSION ; PLAGIOCLASE FELDSPARS ; MICROCLINE ; TEMPERATURE ; KAOLINITE ; POSITIONS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	EDIZIONI NUOVA CULTURA
WOS记录号	WOS:000405162700006
资助机构	Institute of Geology and Geophysics, Chinese Academy of Sciences ; Institute of Geology and Geophysics, Chinese Academy of Sciences ; Institute of Geology and Geophysics, Chinese Academy of Sciences ; Institute of Geology and Geophysics, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/46366]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Liu, Shanke
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, Shanke,Li, Jiaju,Liu, Jianming. An updated model of Rietveld structure refinement of Na/K-feldspar[J]. PERIODICO DI MINERALOGIA,2017,86(1):75-85.
APA	Liu, Shanke,Li, Jiaju,&Liu, Jianming.(2017).An updated model of Rietveld structure refinement of Na/K-feldspar.PERIODICO DI MINERALOGIA,86(1),75-85.
MLA	Liu, Shanke,et al."An updated model of Rietveld structure refinement of Na/K-feldspar".PERIODICO DI MINERALOGIA 86.1(2017):75-85.