強誘電体セラミックスの粒子配向技術

概要

論文の詳細を見る
Grain oriented technology of ferroelectric ceramics with anisotropic grains was originated from the two stage hot-pressing of strongest piezoelectric single crystal powders of SbSI in 1963. In 1976,PbBi_2Nb_2O_9 of Bi-layer compounds with plate like grains were uni-axially hot-pressed and the anisotropies of the dielectric permittivity, bending strength, D-E loops and grain orientation factors by X-ray diffraction were measured with observations of SEM photograph. Tungsten bronze type materials such as (Sr, Ba)Nb_2O_6,(Pb, Ba, La)Nb_2O_6 have bar type grains and the single crystal powders were two-stage hot-pressed. The one dimensionally grain oriented samples showed anisotropies in the X-ray diffraction pattern, SEM photograph, dielectric permittivity, piezoelectric constants and even electrooptic coefficients. Doctor brade technology will be important for the developments of this technology for the future practical applications. In this paper, the progress of grain oriented technology of ferroelectric ceramics with anisotropic crystal structure is reviewed.
湘南工科大学の論文
1994-03-25