The Jahn-Teller distortion and cation ordering in the perovskite Sr2MnSbO6 |
| |
| Authors: | Melina Cheah |
| |
| Institution: | Centre for Structural Biology and Structural Chemistry, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia |
| |
| Abstract: | The perovskite Sr2MnSbO6 has been synthesized using conventional ceramic techniques and structurally characterized using high-resolution powder X-ray and neutron diffraction. The structure is tetragonal in space group I4/m. The octahedra were found to feature Jahn-Teller (JT) distortion due to the presence of Mn3+, and this is identified as strongly contributing to the octahedral tilting. Evidence for B-site cation ordering is presented however there is extensive anti-site disorder. The disordering of the Mn3+ and Sb5+ cations is believed to be a result of the similar size of these two cations and the polarizability of the Sb5+ cation. The structure was found to undergo a transition to cubic symmetry at 521 °C with removal of the octahedral tilting leading to the quenching of the JT distortion. This phase transition was found to be continuous and tricritical in nature. |
| |
| Keywords: | Ordered perovskite Jahn-Tellar distortion Phase transition |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
