Abstract
High resolution transmission electron microscopy is used to study the local structure of twin boundaries and anti-phase boundaries in the β-phase of lead orthovanadate. The local structure along twin boundaries and anti-phase boundaries is found to be γ-like. This γ-like region extends over two or three unit cells of the β-phase. The anti-phase boundaries have a displacement vector which is not exactly half a lattice vector; some additional displacement is present. A new intermediate phase was found around 100°C; it occurs between γ and β.
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