Research on Crystal and Film Ferroelectric Materials for Optoelectronic Applications.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1988
- Accession Number
- ADA193512
Entities
People
- R. R. Neurgaonkar