A Calculation of the Electrostatic Interactions in Fine-Grained Perovskite Ferroelectric Ceramics.
Abstract
The dielectric constants and spontaneous polarization of fine-grained pervoskite ferroelectric ceramics are calculated in terms of the dielectric constants and spontaneous polarization of the constituent crystallites. The latter set of constants are assumed to be those of a single crystal subjected to the same elastic stresses and electric field which a crystallite in a ceramic experiences. In this report, the electric field in a typical crystallite is also calculated, but the elastic stresses are treated in a companion report by Paul L. Smith and Jules de Launay. The values of the dielectric constants and spontaneous polarization of the ceramic also depend on the configuration of the c-axes of the crystallites. Consequently, the calculations are made for when the c-axes are randomly oriented, the c-axes are aligned as nearly as possible along the ceramic symmetry axis, the c-axes are randomly oriented except that no orientations of the second state mentioned above are occupied, and when the c-axes are aligned as nearly as possible to orientations parallel to the equatorial plane of the ceramic. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1971
- Accession Number
- AD0728995
Entities
People
- Jules De Launay
Organizations
- United States Naval Research Laboratory