Ferrielectric phase in the (Bi sub(1/2) Na sub(1/2))TiO sub(3)-Ba(Mg sub(1/3) Nb sub(2/3))O sub(3) system

We have investigated the crystal structure of (1 - x)(Bi sub(1/2) Na sub(1/2))TiO sub(3)-x Ba(Mg sub(1/3) Nb sub(2/3))O sub(3)(BNT-BMN) by high-resolution neutron powder diffraction (NPD) analysis. Our NPD study combined with polarization hysteresis measurements for ceramics reveals that a boundary...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 2015-10, Vol.54 (10)
Main Authors: Kitanaka, Yuuki, Makisumi, Kohei, Oshima, Yumiko, Noguchi, Yuji, Miyayama, Masaru, Torii, Shuki, Kamiyama, Takashi
Format: Article
Language:English
Subjects:
Boundaries
Ceramics
Crystal structure
Diffraction
Ferroelectric materials
Hysteresis
Phase transformations
Polarization
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have investigated the crystal structure of (1 - x)(Bi sub(1/2) Na sub(1/2))TiO sub(3)-x Ba(Mg sub(1/3) Nb sub(2/3))O sub(3)(BNT-BMN) by high-resolution neutron powder diffraction (NPD) analysis. Our NPD study combined with polarization hysteresis measurements for ceramics reveals that a boundary between rhombohedral R3c and tetragonal P4bm phases exists at x= 4-5%. The Rietveld analysis of the NPD data shows that the crystal structure with x = 10% has a single-phase tetragonal structure in space group P4bm, as has been reported for BNT-7%BaTiO sub(3). The sub(P4bm) structure exhibits antiparallel displacements of A- and B-site cations, which results in a small spontaneous polarization (P sub(s)) of 13.3 [mu]C/cm super(2)(estimated from the refined structural parameters). The results obtained for BNT-10%BMN ceramics strongly suggest ferrielectric features; the application of electric fields induces a transition from the P4bm phase with a small P sub(s) to other ferroelectric phases with a large P sub(s).
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.10NC05