Research on Crystal and Film Ferroelectric Materials for Optoelectronic Applications.
Annual rept. 1 Mar 86-28 Feb 87,
ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER
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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 SBN60 crystals which have very large dielectric constants at room temperature. A comprehensive thermodynamic phenomenology is presented for SBN60, 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.
- Electrooptical and Optoelectronic Devices