Abstract
The miscibility of TbBaMn 2O 5+ x and TbBaMn 2O 5.5− 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. TbBaMn 2O 5 is Mn 2+/Mn 3+ 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.
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