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| Title
| - Reinvestigation of Phase Transitions in Na0.5Bi0.5TiO3 by TEM. Part II: Second Order Orthorhombic to Tetragonal Phase Transition
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| Abstract
| - At 400 °C, the presence of 1/2(ooo) reflections attests to local ordering of the A site cations within NBT.
- NBT presents an orthorhombic to tetragonal second order phase transition that occurs near 320 °C. It corresponds to the so-called antiferroelectric−paraelectric phase transition. A model is presented in which the diffuse phase transition is achieved by the progressive canceling of the antiphase octahedra tilting prevailing within a−b+a− orthorhombic structure, whereas the in-phase tilting is maintained. This transformation gives finally rise to the a0a0c+ octahedra tilting system of the tetragonal phase. Electron diffraction experiments show that a long-range ordering occurs within the tetragonal phase. It probably develops as P42/mnm ordered nanoregions disseminated within a P4/mbm disordered matrix. The order is still visible in the temperature domain of the cubic phase.
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| - Phase Transitions in Na0.5Bi0.5TiO3: Second Order
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