New phase transition with increasing symmetry on cooling in barium sodium niobate |
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| Authors: | J. Schneck J. Primot R. Von der Mühll J. Ravez |
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| Affiliation: | Centre National d''Etudes des Télécommunications, 92220 Bagneux, France;Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 33405 Talence, France |
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| Abstract: | A new and unsual transition is reported in Ba2NaNb5O15: the crystal, which was previously known to undergo at 573 K a ferroelastic transition 4mm → mm2 (C4v → C2v), reverts back at 110 ± 5 K to a low temperature phase of 4mm (C4v) symmetry. Thus this crystal presents a unique example of a ferroelastic (mm2) phase stable in a wide temperature range (470 K) and sandwiched between two phases possessing the same higher point symmetry. |
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