Elastic behavior associated with phase transitions in incommensurate Ba2 NaNb5 O15

Herrero-Albillos, J. and Marchment, P. and Salje, E. K. H. and Carpenter, M. A. and Scott, J. F. (2009) Elastic behavior associated with phase transitions in incommensurate Ba2 NaNb5 O15. Physical Review B, 80 (21). p. 214112. DOI https://doi.org/10.1103/PhysRevB.80.214112

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The elastic behavior of barium sodium niobate (Ba2NaNb5O15) has been investigated by resonant ultrasound spectroscopy through six different structural phases, with emphasis on the five incommensurate phase transitions near 40, 110, 547, 565, and 582 K. Data near 40 K are at least consistent with the existence of a lock-in transition to P4nm at that temperature [Filipic et al., J. Phys.: Condens. Matter 19, 236206 (2007)], which has been controversial. A relaxation process occurs around the transition near 110 K and is assigned to a process involving movement of domain walls of the phase. Unusual behavior is observed through the high-temperature incommensurate transitions with large variations in frequency in the ultrasonic resonances, and a broad peak in the dissipation. No clear signature of the 1q-2q incommensurate-incommensurate transition at 565 K is observed. This is compatible with a model in which incommensurate-incommensurate transitions are not expected to manifest elastic anomalies.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA60;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 80
Page Range: p. 214112
Identification Number: https://doi.org/10.1103/PhysRevB.80.214112
Depositing User: Sarah Humbert
Date Deposited: 23 Apr 2010 18:32
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1377

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