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

Report Date:

1980-09-01

Pagination or Media Count:

148.0

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, pepsilon 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. cmc CuCl 6,000 sq. cmc MnI 5,300 sq cmc. 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 Ca2PbC2H5COO6 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. cmc DSP 5,700 sq cmc. A solution growth technique was developed which has produced single crystals of size and quality already adequate for device applications.

Subject Categories:

  • Electrooptical and Optoelectronic Devices
  • Infrared Detection and Detectors
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE