期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 79, 期 1, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.011012
关键词
Pb(In1/2Nb1/2)O-3; B-site randomness; chemical ordering; relaxor; ferroelectric; antiferroelectric; phonon
资金
- Japan Synchrotron Radiation Research Institute (JASRI) [2006B1311]
- Novel States of Matter Induced by Frustration [19052002]
We review the recent progress in Our understanding of the effect of B-site randomness on Pb(In1/2Nb1/2)O-3 (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.
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