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Anomalous phase transitions of lead-free piezoelectric xNa(0.5)Bi(0.5)TiO(3)-(1-x)BaTiO(3) solid solutions with enhanced phase transition temperatures
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Datta, Kaustuv, Thomas, Pam A. and Roleder, K. (2010) Anomalous phase transitions of lead-free piezoelectric xNa(0.5)Bi(0.5)TiO(3)-(1-x)BaTiO(3) solid solutions with enhanced phase transition temperatures. Physical Review B (Condensed Matter and Materials Physics), Volume 82 (Number 22). p. 224105. doi:10.1103/PhysRevB.82.224105 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.82.224105
Abstract
Temperature-dependent structural phase transitions and dielectric properties for a series of xNa(0.5)Bi(0.5)TiO(3)-(1-x)BaTiO(3) (NBT-BT) samples where x ranges from 0.05 to 0.30 have been investigated. Non-ambient x-ray diffraction together with dielectric data as a function of temperature have demonstrated an enhancement in the ferroelectric to paraelectric phase transition temperature with the increase in NBT content, including inhibition of two well-known low-temperature polymorphic phase transitions of BaTiO(3). Anomalous dielectric response has been observed for samples with x >= 0.20 suggesting a crossover from a first-order to a second-order phase transition. The critical point lies between x=0.15 and x=0.20. Deviation from the classical Curie-Weiss law has been seen for samples having x >= 0.10. A modified Curie-Weiss law was employed to model the dielectric response in the paraelectric phase and the maximum value of the critical exponent gamma was found to be 1.45 for x=0.30. It is suggested that the dielectric properties are heavily influenced by the induced strain upon doping rather than chemical inhomogeneities and structural disorder, which are common occurrences in doped ferroelectrics.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Phase transformations (Statistical physics), Piezoelectric ceramics, Ferroelectric crystals, Solutions, Solid | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 10 December 2010 | ||||
Dates: |
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Volume: | Volume 82 | ||||
Number: | Number 22 | ||||
Number of Pages: | 6 | ||||
Page Range: | p. 224105 | ||||
DOI: | 10.1103/PhysRevB.82.224105 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | University of Warwick , Advantage West Midlands (AWM) |
Data sourced from Thomson Reuters' Web of Knowledge
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