Accession Number : AD0748294

Title :   Production of Spontaneous Polarization by Elastic Instabilities in Piezoelectric Materials.

Descriptive Note : Interim scientific rept.,

Corporate Author : NEBRASKA UNIV LINCOLN BEHLEN PHYSICS LAB

Personal Author(s) : Hardy,John R. ; Ullman,Frank G. ; Boyer,Larry L.

Report Date : AUG 1972

Pagination or Media Count : 162

Abstract : Theoretical calculations have been made on the lattice dynamics of gadolinium molybdate (GMO). A rigid ion model has been employed and good overall correlation between the computed normal mode frequencies and those measured by Raman spectroscopy are found An evaluation of the pyroelectric detection capabilities of GMO was completed. Heat capacity vs. temperature measurements were initiated. Optical absorption measurements were continued for different crystal orientations and for light polarized parallel to all three crystal axes, from room temperature to 200C. Raman spectra, obtained previously, have been analyzed and the origins of the spectral lines in the 0-1,000/cm range were identified. A high pressure sample chamber for Raman scattering measurements has been designed and constructed. (Author)

Descriptors :   (*PIEZOELECTRIC CRYSTALS, POLARIZATION), (*FERROELECTRIC CRYSTALS, PHASE STUDIES), GADOLINIUM COMPOUNDS, MOLYBDATES, RAMAN SPECTROSCOPY, FERROELECTRICITY, NEUTRON SCATTERING, SPECIFIC HEAT

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE