Accession Number:

ADA127287

Title:

Research on the Crystal Growth and Dielectric Properties of High Permittivity Ferroelectric Materials.

Descriptive Note:

Annual technical rept. 1 Mar 82-28 Feb 83,

Corporate Author:

ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s):

Report Date:

1983-03-01

Pagination or Media Count:

40.0

Abstract:

The systems investigated for potential millimeter wave applications are the stuffed tungsten bronze single crystal BSKNN, and the modified lead niobate ceramics PKLN and PBN. Low frequency and millimeter wave dielectric measurements show these materials to be promising for future applications. The observed high absorptive loss tan delta approximately 0.2 and rapidly decreasing permittivities at GHz frequencies for these initial samples may be due to piezoelastic coupling to heavily damped elastic waves through localized defects. Work on the hot-pressed growth of PKLN and PBN ceramics shows this technique to be very promising for the enhancement of the dielectric properties of these lead-containing compositions, although cracking of PKLN is presently a problem due to its orthorhombic structure.

Subject Categories:

  • Crystallography
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE