Low temperature behaviour of barium sodium niobate
- 1 January 1978
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 21 (1) , 577-578
- https://doi.org/10.1080/00150197808237334
Abstract
Ba2NaNb5O15, a ferroelectric crystal with the tungsten bronze structure, undergoes the sequence of phase transitions 4/mmm ← 4mm ← mm2 ← 4mm on cooling. Low temperature birefringence and dielectric measurements down to 1.5 K have been achieved on crystals from different origins. The existence of the mm2 ← 4mm transitions appears extremely sample dependent. Moreover a newly discovered sample-independent dielectric anomaly at 12 K is interpreted as the indication of a new phase transition which can possibly be related to the occurrence of ferroelectricity in some other lead containing tungsten bronze compounds.Keywords
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