Ferroic Crystals for Electro-Optic and Acousto-Optic Applications.
Abstract
This contract was concerned with two major topic areas: (1) The attempt to find new ferroelastic crystals which might have interesting 'soft' elastic properties for potential application in acousto-optic devices; and, (2) A systematic examination of the role of domain structures in modifying the macroscopic properties of all types of ferroic crystals and the manner in which these property modifications could be exploited in acousto-optic, electro-optic and piezoelectric devices. A new family of ferroelastic crystals, the alkyl ammonium halometallates were studied and ferroelasticity was discovered in isopropyl ammonium chloroplatinate and chlorostannate. Preliminary studies were also made of ferroelasticity in Pb3GeO5, and the possibility of a polar ferroelastic which is not also ferroelectric demonstrated in (LiNH4)SO4 and Ba2TiGe2O8. A broadly based symmetry classification of all possible ferroic species was completed, and based on this work a new concept was evolved for tailoring the domain structure in suitable primary and secondary ferroics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1975
- Accession Number
- ADA020125
Entities
People
- Leslie Eric Cross
- Robert E. Newnham
Organizations
- Pennsylvania State University