Orientation States of Ferroelectric Domains and {111} Twins in <TEX>$BaTiO_3$</TEX>

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J. Korean Ceram. Soc. > Volume 33(2); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(2): 228.

$BaTiO_3$의 {111}쌍정계면과 강유전 분역의 배향성

박봉모, 정수진

서울대학교 무기재료공학과

Orientation States of Ferroelectric Domains and {111} Twins in $BaTiO_3$

ABSTRACT

It is very important to understand the domain structures of ferroelectric BaTiO3 in the poling process. Especially because {111} twinning is frequently observed in most BaTiO3 ceramics it is required to know the relations between the ferroelectric domains and the structural twin. In this study the domain structures of a {111} twinned crystal sample were observed under a polarizing microscope. and the relation between the {111} twin and the domain configurations could be classified into two types of 'V'-shape and linear shape penetrating perpendicular to the twin boundary. Domain formation obeys the symmetry of the {111} twining when a new domain structure is developed by heat treatment and surface deformation due to domain formation is also occured symmetrically between the both sides of the{111} twin boundary. This symmetrical behavior of the domains could be interpreted with the "head-to-tall" orientation of the domains across the {111} twin boundary

Key words: Barium titanate single crystal, Ferroelectric domains, $90^{\circ}$domain wall, {111} twin