Grain-size-dependent spontaneous relaxor-to-ferroelectric phase transition in (Bi1/2K1/2)TiO3 ceramics

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Dense and phase-pure (Bi1/2K1/2)TiO3 (BKT) ceramics with various average grain sizes from 0.18 to 1.01μm were prepared from a hydrothermally synthesized powder and their phase transition behaviors were studied by means of dielectric measurements. A drastic increase of the maximum dielectric permittivity (εm) with increasing the grain size was found in the temperature dependence of permittivity. The sample with the largest grain size clearly showed both a frequency dependence of dielectric maximum temperature (Tm) and a dielectric anomaly with a strong thermal hysteresis at a temperature below Tm, demonstrating that the BKT ceramic is intrinsically a material exhibiting a spontaneous relaxor to normal ferroelectric (R-nFE) phase transition. On the other hand, the suppression of the R-nFE transition was observed in the sample with the smallest grain size, which was explained as an effect of avoiding the internal stress development caused by the volume increase occurring with the phase transition.

Original languageEnglish
Article number012903
JournalApplied Physics Letters
Issue number1
Publication statusPublished - 2015 Jul 6

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Grain-size-dependent spontaneous relaxor-to-ferroelectric phase transition in (Bi1/2K1/2)TiO3 ceramics'. Together they form a unique fingerprint.

Cite this