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Effect of Crystal‐Axis Orientation on Dielectric Properties of Ceramics Prepared from Fibrous Barium Titanate
Author(s) -
Ohara Yoshinobu,
Koumoto Kunihito,
Yanagida Hiroaki
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb04601.x
Subject(s) - barium titanate , materials science , ceramic , dielectric , composite material , sintering , rod , orientation (vector space) , hydrothermal circulation , crystal (programming language) , permittivity , mineralogy , chemical engineering , optoelectronics , geometry , chemistry , medicine , alternative medicine , mathematics , pathology , computer science , engineering , programming language
Barium titanate (BaTiO 3 ) ceramics with high degrees of a‐ and c ‐axis orientation were fabricated by combining hydrothermal synthesis of fibrous particles, formation of green compacts with aligned extruded rods in the mold, and normal sintering. The orientation of crystal axes in such ceramics gives rise to high dielectric permittivity. Ceramics with an orientation degree f =76% showed values of ε/ε 0 which are 1.5 times (ε/ε 0 = 2700) as large as those of a randomly oriented (commercial) ceramic (ε/ε 0 = 1800).