Experiment and theory of Pb(In1/2Nb1/2)O3: Antiferroelectric, ferroelectric, or relaxor state depending on perovskite B-site randomness

Kenji Ohwada, Yusuke Tomita

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We review the recent progress in our understanding of the effect of B-site randomness on Pb(In1/2Nb1/2)O3 (PIN) from the experimental and theoretical viewpoints. PIN is one of the ideal systems for investigating the effect of perovskite B-site randomness on relaxor formation, because it can be in the antiferroelectric (AFE), ferroelectric (FE), or relaxor state depending on B-site randomness. Lattice dynamics measured in ordered and disordered PINs indicates the existence of FE instability regardless of the B-site randomness of PIN. AFE is stabilized when the B-site is spatially ordered, overwhelming FE instability. The hidden FE state starts to appear as B-site randomness becomes stronger and suppresses AFE instability. Ultimately, the randomness competes with the development of FE regions and blocks long-range FE ordering, which yields polar nanoregions (PNRs) resulting in relaxor behavior. In order to investigate the interesting behavior of PIN, we constructed a minimal model that includes dipolar interaction and easy-axis anisotropy which depends on B-site randomness. The results from Monte Carlo simulations show that the model well reproduces the phase diagram and dielectric constant of PIN qualitatively.

Original languageEnglish
Article number011012
JournalJournal of the Physical Society of Japan
Volume79
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

Keywords

  • Antiferroelectric
  • B-site randomness
  • Chemical ordering
  • Ferroelectric
  • Pb(InNb)O
  • Phonon
  • Relaxor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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