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Synthesis and Crystal Structure of Mg1−x Cu2+x O3 (0.130≤x≤0.166)

✍ Scribed by K. Oh-ishi; Y. Tsuchiya; Y. Iizuka; H. Yamane

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
398 KB
Volume
160
Category
Article
ISSN
0022-4596

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✦ Synopsis

Solid solutions of Mg 1؊x Cu 2؉x O 3 were prepared at 9503C for 12 h in air with a narrow composition range of x from 0.130 to 0.166. Thermal analysis revealed that the sample of x ‫؍‬ 0.143 decomposed into MgO and Cu 2 O above 10303C. The stoichiometric oxygen content based on Cu II valence was con-5rmed with the weight loss after decomposition in H 2 :Ar (20%:80%) atmosphere. The X-ray powder di4raction pattern of the sample (x ‫؍‬ 0.143) was analyzed by the Rietveld method. The structure is isostructural with CaCu 2 O 3 , and related to a rock-salt-type superstructure with an orthorhombic cell, a ‫؍‬ 3.9906(1), b ‫؍‬ 9.3482(3), and c ‫؍‬ 3.1911(1) A > , space group Pmmn (No. 59, setting 2). There are two metal atom sites in the structure. One metal atom site (4e) occupied by Cu atoms is in an elongated octahedron of oxygen atoms. The other site (2b) is statistically occupied by Cu and Mg atoms with fractions of 0.143 and 0.857, respectively.

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