Accession Number : ADA298484

Title :   Ferroelectric Materials for Applications in Sensor Protection.

Descriptive Note : Final rept. 16 Sep 91-31 Oct 94,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s) : Bhalla, Amar S. ; Cross, L. E.

PDF Url : ADA298484

Report Date : 08 JUL 1995

Pagination or Media Count : 104

Abstract : The focus of this program has been upon producing and characterizing new functional materials whose properties can be fine tuned to provide eye sensor protection against laser threats and to suit a range of optoelectronic device applications. Material systems that maximize orientational anisotropy (for use in scattering mode systems) and systems that minimize orientational anisotropy (for use in high field modulators and field induced photorefractive applications) were both approached. Relaxor ferroelectric tungsten bronze single crystals (Sr,Ba)Nb2O6 and (Pb,Ba)Nb2O6 solid solution families and relaxor ferroelectric perovskite (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PI) families, were studied extensively. The unique capabilities of a laser heated pedestal growth (LHPG) system were utilized for growth of new materials in single crystal fiber form that produces crystals of long interaction length for optical wave in the crystal and high crystal perfection with maximized properties along chosen directions. Hc uniaxial pressing hot forging, or appropriate solid state reaction processing methods were used to produce transparent polycrystalline ceramics to provide low scattering high anisotropy ceramics or high scattering high anisotropy ceramics. This final report summarizes significant results produced from this program through combination of experimental and crystal chemistry approaches in this field, delineates conclusions drawn from the research, and provides recommendations for future research.

Descriptors :   *EYE SAFETY, *FERROELECTRIC MATERIALS, *CRYSTAL CHEMISTRY, LIGHT SCATTERING, OPTICAL PROPERTIES, ELECTROOPTICS, THREATS, TRANSPARENCE, SINGLE CRYSTALS, CRYSTALS, FORGING, CERAMIC MATERIALS, ANISOTROPY, PROTECTION, MOUNTS, OPTICAL DETECTORS, LASER MODULATORS, CRYSTAL GROWTH, POLYCRYSTALLINE, HOT WORKING, PRESSING(FORMING), PEROVSKITES.

Subject Categories : Safety Engineering
      Radiobiology
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE