Optical, elastic, and dielectric studies of the phase transitions in lawsonite
- Author(s)
- Peter Sondergeld, Wilfried Schranz, Andreas Tröster, Michael Allan Carpenter, Eugen Libowitzky, A V Kityk
- Abstract
Results of optical birefringence, ultralow-frequency elastic, dilatometric, and dielectric measurements of lawsonite crystals are presented in a wide temperature range including two successive phase transitions Cmcm-(T1 = 273 K)?Pmcn-(T2= 120 K)?P21cn. Pronounced pretransitional effects are observed in macroscopic properties in a large temperature region (˜200 K) above T1. The low-temperature transition at T2 = 120 K is found to be proper ferroelectric. A deviation from the Curie-Weiss law appears in the temperature dependence of the dielectric susceptibility in the region of the ferroelectric transition below T2. Frequency dependent measurements of the dielectric permittivity yield evidence that ferroelectric domain-wall motion is responsible for this deviation from the standard behavior.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- University of Cambridge, Institute of Physical Optics
- Journal
- Physical Review B
- Volume
- 62
- Pages
- 6143-6147
- No. of pages
- 5
- ISSN
- 1098-0121
- DOI
- https://doi.org/10.1103/PhysRevB.62.6143
- Publication date
- 2000
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/bdd75a02-7fde-47d5-9ffc-c4a114cc6a49