Anomalous behavior of the acoustic phonon velocity and elastic constants of relaxor ferroelectric PbMg1/3Ta2/3O3
- 1. Ioffe Physico-Technical Institute of Russian Academy of Sciences, 194021 St Petersburg, Politekhnicheskaya street, 26 (Russian Federation)
- 2. Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
- 3. Department of Physics, Hallym University, 39 Hallymdaehakgil, Chuncheon, Gangwondo 200-702 (Korea, Republic of)
- 4. Institute of Materials Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan)
Description
The behavior of longitudinal acoustic (LA) and transverse acoustic (TA) phonons in a cubic relaxor PbMg1/3Ta2/3O3 (PMT) ferroelectric has been investigated by Brillouin light scattering. Analysis of the temperature dependences of phonon velocity in the temperature range from 50 to 870 K has revealed anomalies in the vicinity of the Burns temperature (TB∼570 K) for LA phonons and a wide frequency-dependent minimum of the velocities of LA and TA phonons in the same temperature region as the dielectric response anomaly. Using experimental data, temperature dependences of the C11 and C44 elastic constants have been calculated. The elastic constants have been found to be frequency-independent in the gigahertz range. The results obtained are discussed in the framework of modern ideas on the crystalline lattice dynamics of relaxor ferroelectrics
Additional details
Identifiers
- DOI
- 10.1088/0953-8984/19/49/496206;
- PII
- S0953-8984(07)55844-3;
Publishing Information
- Journal Title
- Journal of Physics. Condensed Matter
- Journal Volume
- 19
- Journal Issue
- 49
- Journal Page Range
- p. 496206
- ISSN
- 0953-8984
- CODEN
- JCOMEL
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39060331
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE;
- Descriptors DEI
- ELASTICITY; FERROELECTRIC MATERIALS; FREQUENCY DEPENDENCE; LEAD COMPOUNDS; LIGHT SCATTERING; MAGNESIUM COMPOUNDS; PHONONS; TANTALATES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE; VELOCITY
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; DIELECTRIC MATERIALS; MATERIALS; MECHANICAL PROPERTIES; OXYGEN COMPOUNDS; QUASI PARTICLES; REFRACTORY METAL COMPOUNDS; SCATTERING; TANTALUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS