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Structural investigations of the bismuth scandate-lead titanate xBiScO3-(1-x) PbTiO3 solid solution for 0.10 <= x <= 0.40
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Datta, K., Walker, David and Thomas, Pam A. (2010) Structural investigations of the bismuth scandate-lead titanate xBiScO3-(1-x) PbTiO3 solid solution for 0.10 <= x <= 0.40. Physical Review B (Condensed Matter and Materials Physics), Vol.82 (No.14). article no. 144108 . doi:10.1103/PhysRevB.82.144108
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Official URL: http://dx.doi.org/10.1103/PhysRevB.82.144108
Abstract
A full structural study of the solid solution xBiScO(3)-(1-x)PbTiO3 (BS-PT) has been carried out by neutron powder diffraction using the General Materials Diffractometer (GEM) at ISIS facility in Oxford and complemented by in-house x-ray diffraction studies and high-temperature dielectric measurements. Atomic positions and thermal-displacement parameters have been determined by Rietveld refinement of neutron powder-diffraction data for a total of 14 different compositions of BS-PT, where 0.10 <= x <= 0.40. A gradual structural phase transition from a tetragonal (space group: P4mm) phase to a rhombohedral (space group: R3m) phase as a function of composition has been observed and the phase boundary is identified as a mixture of a tetragonal and a monoclinic phase with space group Cm. However, the refined anisotropic thermal parameters in the region x >= 0.39 are found to be unrealistic for the average crystal structure and instead of a rhombohedral phase, a monoclinic phase (Cm) is suggested for the compositions x >= 0.39. In addition, temperature-dependent dielectric measurements have been carried out to demonstrate the physical properties of the ceramics including ferroelectric transition temperatures as a function of composition.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Bismuth, Phase rule and equilibrium, Piezoelectricity, Curie temperature, Ferroelectric crystals | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 15 October 2010 | ||||
| Dates: |
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| Volume: | Vol.82 | ||||
| Number: | No.14 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | article no. 144108 | ||||
| DOI: | 10.1103/PhysRevB.82.144108 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | University of Warwick |
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