| A-site ordered perovskite CaCu_3Cu_2Ir_2O_(12-δ) with square-planar and octahedral coordinated Cu ions |
| |
| 引用本文： | 赵庆,殷云宇,戴建洪,沈希,胡志伟,杨俊叶,王清涛,禹日成,李晓东,龙有文.A-site ordered perovskite CaCu_3Cu_2Ir_2O_(12-δ) with square-planar and octahedral coordinated Cu ions[J].中国物理 B,2016,25(2):20701-020701. |
| |
| 作者姓名： | 赵庆 殷云宇 戴建洪 沈希 胡志伟 杨俊叶 王清涛 禹日成 李晓东 龙有文 |
| |
| 基金项目： | Project supported by the National Basic Research Program of China (Grant No. 2014CB921500), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07030300), and the National Natural Science Foundation of China (Grant No. 11574378). |
| |
| 摘 要： | A novel CaCu_3Cu_2Ir_2O_(12-δ) polycrystalline sample was synthesized at 8 GPa and 1373 K.Rietveld structural analysis shows that this compound crystallizes in an AA'_3B_4O_(12)-type A-site ordered perovskite structure with space group Im-3.Xray 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~(2+) are 1:3 ordered at fixed atomic positions,the distribution of B-site Cu~(2+) and Ir~(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.
|
| 收稿时间： | 2015-10-13 |
A-site ordered perovskiteCaCu3Cu2Ir2O12-δ with square-planar and octahedral coordinated Cu ions |
| |
| Abstract: | A novel CaCu3Cu2Ir2O12-δ polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an AA'3B4O12-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. |
| |
| Keywords: | high pressure synthesis A-site ordered perovskite valence state magnetic property |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
