Ferroelectric ceramics for dielectric power conversion. Annual report, March 1, 1979-April 30, 1980

Materials selected for study were those which could be expected to have useful Curie temperatures, resistivities, coercive fields, and Devonshire coefficients. Materials studied include PZT (lead-zirconia-titania system), Bi(Na,K)Ti/sub 2/O/sub 6/, rare earth titanoniobates, other tantalates and niobates, and thin films. Graphs are given for spontaneous polarization as a function of composition, temperature dependence of spontaneous polarization and coercive field for modified PSZT dielectrics, temperature dependence of electric resistivity for modified PSZT dielectrics, and x-ray diffraction data. Materials forming and processing techniques are briefly described. (WHK