Accession Number : ADA092566


Title :   Optimized Pyroelectric Vidicon Thermal Imager. Volume II. Improper Ferroelectric Crystal Growth.


Descriptive Note : Final technical rept. Aug 78-Nov 79 on Phase 2,


Corporate Author : PHILIPS LABS BRIARCLIFF MANOR NY


Personal Author(s) : Smith,Wallace Arden ; Loiacono,Gabriel ; Shaulov,Avner


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a092566.pdf


Report Date : Sep 1980


Pagination or Media Count : 148


Abstract : Complete dielectric, pyroelectric, and thermal characterizations of Fe3B7O13I, Cu3B7O13Cl and Mn3B7O13I were performed to confirm the expectation that the boracite family of improper ferroelectrics exhibits high pyroelectric open-circuit voltage response. In each of these materials, the figure of merit, p/epsilon c, rises as the transition temperature is approached; the peak value attained at the transition varies only slightly in a temperature interval of several degrees below the transition. The peak figures-of-merit of these materials are larger than that of TGS and close to that of DTGFB (FeI: 6,000 sq. cm/c; CuCl; 6,000 sq. cm/c; MnI: 5,300 sq cm/c. A vapor-transport growth technique was developed which can produce boracite single crystals of sufficient size for device applications. Complete dielectric, pyroelectric, and thermal characterizations of dicalcium leat propionate (DLP) Ca2Pb(C2H5COO)6 and dicalcium strontium propionate (DSP) family of pseudo-proper ferroelectrics exhibits a high, broad maximum in their figures of merit. The measured figures-of-merit are larger than that of TGS and close to that of DTGFB (DLP: 5,000 sq. cm/c; DSP: 5,700 sq cm/c. A solution growth technique was developed which has produced single crystals of size and quality already adequate for device applications.


Descriptors :   *PYROELECTRICITY , *CRYSTAL GROWTH , *FERROELECTRIC CRYSTALS , *INFRARED VIDICONS , THERMAL PROPERTIES , PHASE TRANSFORMATIONS , DIELECTRICS , TRANSITION TEMPERATURE , FIGURE OF MERIT , PROPIONATES


Subject Categories : Electrooptical and Optoelectronic Devices
      Infrared Detection and Detectors
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE