Relaxor-ferroelectric crossover in (B i1/2 K1/2)Ti O3: Origin of the spontaneous phase transition and the effect of an applied external field

Manabu Hagiwara, Yoshitaka Ehara, Nikola Novak, Neamul H. Khansur, Azatuhi Ayrikyan, Kyle G. Webber, Shinobu Fujihara

研究成果: Article査読

28 被引用数 (Scopus)

抄録

The temperature evolution of polar order in an A-site complex perovskite (Bi1/2K1/2)TiO3 (BKT) has been investigated by measurements of dielectric permittivity, depolarization current, and stress-stain curves at elevated temperatures. Upon cooling from high temperatures, BKT first enters a relaxor state and then spontaneously transforms into a ferroelectric state. The analyses of temperature and frequency dependence of permittivity have revealed that polar nanoregions of the relaxor phase appear at temperatures higher than 560C, and also that their freezing at 296C triggers the spontaneous relaxor-ferroelectric transition. We discuss the key factors determining the development of long-range polar order in A-site complex perovskites through a comparison with the relaxor (Bi1/2Na1/2)TiO3. We also show that application of biasing electric fields and compressive stresses to BKT favors its ferroelectric phase, resulting in a significant shift of the relaxor-ferroelectric transition temperature towards higher temperatures. Based on the obtained results, electric field-temperature and stress-temperature phase diagrams are firstly determined for BKT.

本文言語English
論文番号014103
ジャーナルPhysical Review B
96
1
DOI
出版ステータスPublished - 2017 7月 6

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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