High-temperature neutron diffraction study of the cation ordered perovskites TbBaMn2O5+x and TbBaMn2O5.5−y |
| |
| Authors: | Elizabeth Castillo-Martínez J Paul Attfield |
| |
| Institution: | a Dpto. de Quimica Inorganica I, Facultad de Ciencias Quimicas, Universidad Complutense, Av. Complutense s/n, 28040 Madrid, España
b Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom |
| |
| Abstract: | The miscibility of TbBaMn2O5+x and TbBaMn2O5.5−y has been investigated at 100-600 °C using in situ powder neutron diffraction. No miscibility is observed, and the two phases remain oxygen stoichiometric (x,y=0) at 600 °C. Structure refinement results show that neither material undergoes a phase transition in this temperature range. TbBaMn2O5 is Mn2+/Mn3+ charge ordered and any charge melting transition is >600 °C. This symmetry-broken charge ordering is remarkably robust in comparison to that in other oxides. |
| |
| Keywords: | Neutron diffraction |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
