Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3 |
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| Authors: | Chen-Yang ShiYong-Mei Hao Zhong-Bo Hu |
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| Affiliation: | a College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, 19 (A) Yu Quan Road, Beijing 100049, China
b College of Materials and Photoelectric Technology, Graduate University of Chinese Academy of Sciences, 19(A) Yu Quan Road, Beijing 100049, China |
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| Abstract: | The synthesis, structural and magnetic properties of a new type high permittivity material Ca(Ti1/2Mn1/2)O3 was reported. The sample was prepared by conventional solid-state reaction route. Rietveld analysis revealed it was single perovskite with space group Pnma. Normalized bond length and bond valence were calculated to investigate the compression/dilation effects of bonds and atoms in unit cell. There were five types of Ca-O bonds and three kinds of (Ti, Mn)-O bonds in Ca(Ti1/2Mn1/2)O3. The susceptibility curve at high temperature followed the Curie-Weiss law with Curie and Weiss constant as 0.8991 emu K/mol and −276.3 K, respectively. The calculated effective moment per Mn is 2.68 μB-Bohr magneton. Antiferromagnetism and spin glass state at low temperature were found in Ca(Ti1/2Mn1/2)O3. Frustration parameter was estimated to be about 30, suggesting the cluster-spin-glass resulted from geometrical frustration. |
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| Keywords: | Single perovskite Bond valence Bond length Antiferromagnetism Spin glass state |
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