A neutron powder diffraction study of the κ phase in the FeWC system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A neutron powder diffraction study of the κ phase in the FeWC system

Authors:	Anders Hårsta Stig Rundqvist John O. Thomas

Affiliation:	Institute of Chemistry, University of Uppsala, Box 531, S-751 21 Uppsala, Sweden

Abstract:	The crystal structure of the κ-carbide in the FeWC system has been refined from neutron powder diffraction data using the Rietveld profile analysis method. κ-(FeWC) is isostructural with κ-(CoWC); space group $P6_{3} mmc$ ; unit cell dimensions a = 7.7982(2)Å, c = 7.8298(4) Å. The structure refinement indicates $Fe W$ substitution at two of the tungsten sites, and 46% vacancies at one of the carbon sites. The composition corresponds to the formula Fe_3+xW_10?xC_4?y, with x = 0.57(3) and y = 0.46(1).

Keywords:	To whom correspondence should be addressed.
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