Published July 4, 2008
| Version v1
Journal article
Pressure-Induced Phase Transition in PbSc0.5Ta0.5O3 as a Model Pb-Based Perovksite-Type Relaxor Ferroelectric
Creators
- 1. Mineralogisch-Petrographisches Institut, Universitaet Hamburg, Grindelallee 48, 20146 Hamburg (Germany)
- 2. Virginia Tech Crystallography Laboratory, Department of Geosciences, Virginia Tech, Blacksburg, Virginia 24060 (United States)
- 3. Institute of Solid State Physics, Bulgarian Academy of Sciences, Boulevard Tzarigradsko Chausse 72, 1784 Sofia (Bulgaria)
- 4. Institut fuer Mineralogie, Petrologie und Kristallographie, Universitaet Marburg, Hans-Meerwein-Strasse, 35032 Marburg (Germany)
- 5. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)
Description
We report pressure-induced structural changes in PbSc0.5Ta0.5O3 studied by single-crystal x-ray diffraction and Raman scattering. The appearance of a soft mode, a change in the volume compressibility, broadening of the diffraction peaks, and suppression of the x-ray diffuse scattering show that a phase transition occurs near pc∼1.9 GPa. The critical pressure is associated with a decoupling of the displacements of the B site and Pb cations in the existing polar nanoregions, leading to the suppression of B-cation off-center shifts and enhancement of the ferroic distortion in the Pb-O system
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 101
- Journal Issue
- 1
- Journal Page Range
- p. 017602-017602.4
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40015457
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CATIONS; COMPRESSIBILITY; CRITICAL PRESSURE; DIFFUSE SCATTERING; FERROELECTRIC MATERIALS; LEAD COMPOUNDS; LEAD IONS; MONOCRYSTALS; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; RAMAN EFFECT; SCANDIUM COMPOUNDS; TANTALATES; X-RAY DIFFRACTION
- Descriptors DEC
- CHARGED PARTICLES; COHERENT SCATTERING; CRYSTALS; DIELECTRIC MATERIALS; DIFFRACTION; IONS; MATERIALS; MECHANICAL PROPERTIES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PRESSURE RANGE; REFRACTORY METAL COMPOUNDS; SCATTERING; TANTALUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- (c) 2008 The American Physical Society