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A-site ordered perovskite CaCu3Cu2Ir2O12-delta with square-planar and octahedral coordinated Cu ions

MPG-Autoren
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Hu,  Zhi-Wei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Zhao, Q., Yin, Y.-Y., Dai, J.-H., Shen, X., Hu, Z.-W., Yang, J.-Y., et al. (2016). A-site ordered perovskite CaCu3Cu2Ir2O12-delta with square-planar and octahedral coordinated Cu ions. Chinese Physics B, 25(2): 020701, pp. 1-6. doi:10.1088/1674-1056/25/2/020701.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002A-0983-F
Zusammenfassung
A novel CaCu3Cu2Ir2O12-delta polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an AA(3)'B4O12-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 Cu2+ are 1:3 ordered at fixed atomic positions, the distribution of B-site Cu2+ and Ir5+ 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.