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Dielectric and ferroelectric properties evolution of (1−x)(Bi0.5Na0.5TiO3)–xK0.5Na0.5NbO3 piezoceramics

Authors
  • PRADO, A1
  • RUBIO-MARCOS, F2, 3
  • RAMAJO, L1
  • CASTRO, M S1
  • 1 Institute of Research in Materials Science and Technology (INTEMA), Av. Colón 10850, Mar del Plata, B7606BWV, Argentina , Mar del Plata (Argentina)
  • 2 CSIC, Kelsen 5, Madrid, 28049, Spain , Madrid (Spain)
  • 3 Universidad Antonio de Nebrija, Pirineos 55, Madrid, 28040, Spain , Madrid (Spain)
Type
Published Article
Journal
Bulletin of Materials Science
Publisher
Springer-Verlag
Publication Date
Oct 17, 2020
Volume
43
Issue
1
Identifiers
DOI: 10.1007/s12034-020-02246-9
Source
Springer Nature
Keywords
License
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Abstract

In this work, piezoceramics of (1−x)(Bi0.5Na0.5)TiO3–x(K0.5Na0.5)NbO3, (1−x)BNT–xKNN, in the compositional range 0.00 ≤ x ≤ 0.07, were prepared by a mechanochemically activated solid-state method. The structural phase formation and microstructural, dielectric, and ferroelectric properties were studied. Although changes, in symmetry of the perovskite structure, were not detected with the composition (i.e., from a perspective of its intrinsic properties), the microstructural evolution was strongly dependent on the content of the KNN phase (i.e., based on its extrinsic properties). Specifically, KNN favoured the formation of a microstructure with cubic grains, typical morphology of the alkaline niobate ceramics. After KNN addition, both the maximum permittivity temperature and the long-range to short-range ordered transition temperature were reduced. Additionally, ferroelectric loops and strain deformation curves also reflect the long-range to short-range order evolution with KNN addition and temperature.

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