X-ray powder diffraction reference patterns for Bi1−xPbxOCuSe. Issue 3 (September 2016)

• Record Type: Journal Article
• Authors: Wong-Ng, W.; Yan, Y.; Kaduk, J.A.; Tang, X.F.
• Is Part Of: Powder diffraction. Volume 31:Issue 3(2016)
• Page Start: 223
• Page End: 228
• Publication Date: 2016-09
• Subjects: thermoelectric material, -- Bi1−xPbxOCuSe, -- powder X-ray reference patterns, -- crystal structure; Powder metallurgy -- Periodicals; Materials -- Analysis -- Periodicals; 620.1127
• DOI: 10.1017/S0885715616000361
• Languages: English
• ISSNs: 0885-7156

Abstract

Abstract : The structures and powder X-ray reference diffraction patterns of the "natural superlattice" series Bi1− x Pb x OCuSe ( x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) have been investigated. As the ionic radius of Pb 2+ is greater than that of Bi 3+, the unit-cell volume of Bi1− x Pb x OCuSe increases progressively from x = 0 to 0.1, namely, from 137.868(5) to 139.172(11) Å 3, as expected. The structure of Bi1− x Pb x OCuSe is built from [Bi2(1− x ) Pb2 x O2 ] 2(1− x )+ layers normal to the c -axis alternating with [Cu2 Se2 ] 2(1− x )− fluorite-like layers. Pb substitution in the Bi site of Bi1− x Pb x OCuSe leads to the weakening of the "bonding" between the [Bi2(1− x ) Pb2 x O2 ] 2(1− x )+ and the [Cu2 Se2 ] 2(1− x )− layers. Powder patterns of Bi1− x Pb x OCuSe were submitted to be included in the Powder Diffraction File.