A-site ordered perovskite CaCu sub(3) Cu sub(2) Ir sub(2) O sub(12-[delta]) with square-planar and octahedral coordinated Cu ions

A novel CaCu sub(3) Cu sub(2) Ir sub(2) O sub(12-[delta]) polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an -AA' sub(3) B sub(4) O sub(12)-type A-site ordered perovskite structure with space group Im-3. X-ray abs...

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Published inChinese physics B Vol. 25; no. 2
Main Authors Zhao, Qing, Yin, Yun-Yu, Dai, Jian-Hong, Shen, Xi, Hu, Zhi-Wei, Yang, Jun-Ye, Wang, Qing-Tao, Yu, Ri-Cheng, Li, Xiao-Dong, Long, You-Wen
Format Journal Article
LanguageEnglish
Published 01.02.2016
Subjects
Copper
COPPER IONS
CRYSTAL STRUCTURE
Crystallization
ELECTRONIC PRODUCTS
Electronics
Heat capacity
SPECIFIC HEAT
Structural analysis
Transport
X RAYS
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Summary:A novel CaCu sub(3) Cu sub(2) Ir sub(2) O sub(12-[delta]) polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an -AA' sub(3) B sub(4) O sub(12)-type A-site ordered perovskite structure with space group Im-3. X-ray absorption spectra reveal a +2-charge state for both the square-planar and octahedral coordinated Cu ions, and the valence state of Ir is found to be about +5. Although the A-site Ca and the A'-site Cu super(2+) are 1:3 ordered at fixed atomic positions, the distribution of B-site Cu super(2+) and Ir super(5+) is disorderly. As a result, no long-range magnetic ordering is observed at temperatures down to 2 K. Electrical transport and heat capacity measurements demonstrate itinerant electronic behavior. The crystal structure is stable with pressure up to 35.7 GPa at room temperature.
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ISSN:1674-1056
1741-4199
DOI:10.1088/1674-1056/25/2/020701