Abstract
The antiferroelectric phase transition in titanite characterised by a collinear displacement of Ti-atoms from their central octahedral position is investigated using linear optical birefringence and X-ray diffraction techniques. Both methods indicate a continuous transition near 496 K and extra contributions to δΔn and X-ray intensity signals at higher temperatures. The critical exponent of the macroscopic order parameter is found to be β = 0.14 ± 0.02 and the transformation is interpreted in terms of a two-dimensional quasi-spin model. Topological features of the structure agree well with the spatial distribution of the diffuse scattering of the superstructure reflection 40\(\bar 3\).
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Bismayer, U., Schmahl, W., Schmidt, C. et al. Linear birefringence and X-Ray diffraction studies of the structural phase transition in titanite, CaTiSiO5 . Phys Chem Minerals 19, 260–266 (1992). https://doi.org/10.1007/BF00202317
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DOI: https://doi.org/10.1007/BF00202317