Accession Number : ADA193512

Title :   Research on Crystal and Film Ferroelectric Materials for Optoelectronic Applications.

Descriptive Note : Annual rept. 1 Mar 86-28 Feb 87,

Corporate Author : ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s) : Neurgaonkar, R R

PDF Url : ADA193512

Report Date : Mar 1988

Pagination or Media Count : 204

Abstract : The millimeter wave dielectric behavior of several tungsten bronze ferroelectrics is presented, along with a theoretical evaluation of the origin of the dielectric losses which are shown to arise from polar microdomain fluctuations. Data is also presented for new, La-modified bronze SBN:60 crystals which have very large dielectric constants at room temperature. A comprehensive thermodynamic phenomenology is presented for SBN:60, showing a unique tetracritical phase transition behavior for this ferroelectric. This same phenomenology fails for bronze BSKNN crystals, however, indicating a heretofor unrecognized improper ferroelastic contribution to the dielectric properties. Keywords: Electro-optic effect, Perovskite thin films.

Descriptors :   *ELECTROOPTICS, *FERROELECTRIC MATERIALS, *THIN FILMS, BRONZE, CONSTANTS, CRYSTALS, DIELECTRIC PROPERTIES, DIELECTRICS, FILMS, LOSSES, MILLIMETER WAVES, PEROVSKITES, PHASE STUDIES, PHASE TRANSFORMATIONS, ROOM TEMPERATURE, TEST AND EVALUATION, THERMODYNAMICS, TUNGSTEN, METAL FILMS

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE