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Structure evolution and ferroelectric properties in stoichiometric Bi.sub.0.5+xNa.sub.0.5-xTi.sub.1-0.5xO.sub.3

Journal of materials science, 2019-04, Vol.54 (7), p.5249 [Peer Reviewed Journal]

COPYRIGHT 2019 Springer ;ISSN: 0022-2461 ;EISSN: 1573-4803 ;DOI: 10.1007/s10853-018-03262-1

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  • Title:
    Structure evolution and ferroelectric properties in stoichiometric Bi.sub.0.5+xNa.sub.0.5-xTi.sub.1-0.5xO.sub.3
  • Author: Shi, Jing ; Liu, Xiao ; Tian, Wenchao
  • Subjects: Ceramics
  • Is Part Of: Journal of materials science, 2019-04, Vol.54 (7), p.5249
  • Description: The influence of B-site deficiency on the stability of electrically induced long-range ferroelectric order of the stoichiometric Bi.sub.0.5+xNa.sub.0.5-xTi.sub.1-0.5x[white square].sub.0.5xO.sub.3 (BNT-xV.sub.Ti) ("[white square]" denotes vacancies) ceramics is studied. The depolarization and ferroelectric to relaxor transition are identified as separate and discrete processes in BNT-based materials. For BNT-0.02V.sub.Ti, the resonance and anti-resonance peaks on dielectric permittivity-frequency curves indicate dominating ferroelectric phase at room temperature. The depolarization temperature, determined by thermally stimulated depolarization current, is ~ 65 °C. However, the ferroelectric to relaxor transition temperature is absent, as no distinct frequency-independent anomalies for the dielectric permittivity exist. This depolarization process can be ascribed to nanoscale ferroelectric domain at room temperature for BNT-0.02V.sub.Ti, which is induced by chemical disorder and strong random field as V.sub.Ti generated. Hence, the results imply that the B-site deficiency in BNT is a very effective route to tailor the stability of electrically induced long-range ferroelectric order.
  • Publisher: Springer
  • Language: English
  • Identifier: ISSN: 0022-2461
    EISSN: 1573-4803
    DOI: 10.1007/s10853-018-03262-1
  • Source: ProQuest Central
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