The antiferroelectric phase transition in TlH2PO4 and TlD2PO4 |
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Authors: | R.J. Nelmes |
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Affiliation: | Department of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland |
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Abstract: | It is shown by X-ray diffraction measurements that the transitions at 230 K in TlH2PO4 and at ≈ 350 K in TlD2PO4 are structurally equivalent. In both cases, on cooling through the transition, new reflections appear at points (, , l) referred to the primitive monoclinic unit cell of the high-temperature phase. In TlH2PO4 some distinct but broadened scattering remains at the (, , l) points up to 10 K, or more, above the transition temperature. |
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