Accession Number : AD0768625

Title :   Ferroelectric Research and Device Exploration.

Descriptive Note : Final rept. 15 Mar 72-30 Jun 73,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s) : Cross,Leslie E. ; Newnham,Robert E.

Report Date : AUG 1973

Pagination or Media Count : 134

Abstract : Work on this contract has demonstrated through the correlation of structural, dielectric and optical studies on mixed bismuth oxide layer structure compounds what is perhaps the first well authenticated instance of a ferroelectric:ferroelectric phase transition in the single crystal Bi2SrTa2O9 which involves no change of crystal symmetry. A new family of organo-metallic ferroelastic crystals embracing the compounds Isopropyl Ammonium Chloroplatinate (IPACP) and Chlorostannate (IPACS) has been investigated and shown to have potentially interesting thermo-optic and acoustooptic properties. Dielectric and structural studies have been continued on Pb5Ge3O11 crystals and solid solutions, and the strong dielectric relaxation for (Xi(33) near T(c) has been partially resolved. For the system Pb5Ge(2-x)Si(x)O11 glassy phases phases have been quenched from the stoichiometric ferroelectric compositions, and the recrystallization to a ferroelectric polycrystalline form investigated. (Modified author abstract)

Descriptors :   (*FERROELECTRIC CRYSTALS, PHYSICAL PROPERTIES), CRYSTAL GROWTH, CRYSTAL STRUCTURE, SINGLE CRYSTALS, DIELECTRIC PROPERTIES, HYDROSTATIC PRESSURE, HYSTERESIS, OPTICAL PROPERTIES, RECRYSTALLIZATION, DIFFERENTIAL THERMAL ANALYSIS, X RAY DIFFRACTION, BISMUTH COMPOUNDS, TANTALUM COMPOUNDS, STRONTIUM COMPOUNDS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE