Optical, elastic, and dielectric studies of the phase transitions in lawsonite

Autor(en)

Peter Sondergeld, Wilfried Schranz, Andreas Tröster, Michael Allan Carpenter, Eugen Libowitzky, A V Kityk

Abstrakt

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(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

University of Cambridge, Institute of Physical Optics

Journal

Physical Review B

Band

62

Seiten

6143-6147

Anzahl der Seiten

5

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.62.6143

Publikationsdatum

2000

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bdd75a02-7fde-47d5-9ffc-c4a114cc6a49