At high temperatures, BaTiO 3 has the cubic perovskite structure. On cooling, it undergoes a series of

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At high temperatures, BaTiO3 has the cubic perovskite structure. On cooling, it undergoes a series of phase transitions in which the Ti atom moves away from the center of the TiO6 octahedron, and there are changes in the space group and unit-cell parameters causing the ferroelectric behavior discussed in Chapter 8. Determine the number of twindomain variants (orientations) that could form in the first step when the cubic (a ≈ 4 Å, space group Pm3m) structure undergoes a phase transition to a tetragonal structure with space group P4mm and cell parameters a = b ≈ c ≈ 4 Å, α = β = γ = 90°.

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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