Crystallographic features of the relaxor state in the mixed ferroelectric system Ba(Ti1-xZrx)O3

Hirofumi Tsukasaki, Yasuhide Inoue, Yasumasa Koyama

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

The relaxor state has been found in the mixed ferroelectric system Ba(Ti1-xZrx)O3 around x = 0.35. To understand the nature of the relaxor state, the crystallographic features of the paraelectric (PC), ferroelectric, and relaxor states for 0.15 ≤ x ≤ 0.40 have been investigated mainly by transmission electron microscopy. It was found that a microstructure of the ferroelectric state for 0.15 ≤ x ≤ 0.28 consisted of banded structures with boundaries parallel to the {110}PC and {100}PC planes. Based on the Sapriel theory concerning ferroelastic transitions, it was understood that the banded structures were consistent with domain structures in the ferroelectric rhombohedral (FR) state having a polarization vector parallel to one of the <111> PC directions. With the help of the failure of Friedel's law in diffraction, furthermore, polar regions having <001>PC and <110>PC components of a <111>PC polarization vector were also found to be separately observed in the PC and relaxor states as well as the FR state. Then, in-situ observation for 0.29 ≤ x ≤ 0.40 made in this study indicated that the PC and relaxor states consisted of polar nanometer-sized regions having these two components. Based on this, the relaxor state in BTZ can be identified as an assembly of polar nanometer-sized regions, which were produced by the suppression of the (PC→FR) ferroelectric transition on cooling.

本文言語English
ホスト出版物のタイトルTHERMEC 2013
編集者B. Mishra, Mihail. Ionescu, T. Chandra
出版社Trans Tech Publications Ltd
ページ2400-2405
ページ数6
ISBN(印刷版)9783038350736
出版ステータスPublished - 2014 1 1
イベント8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV, United States
継続期間: 2013 12 22013 12 6

出版物シリーズ

名前Materials Science Forum
783-786
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Conference

Conference8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
国/地域United States
CityLas Vegas, NV
Period13/12/213/12/6

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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