Accession Number : ADA114063

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

Descriptive Note : Annual technical rept. 15 May 81-28 Feb 82,

Corporate Author : ROCKWELL INTERNATIONAL THOUSAND OAKS CA MICROELECTRONICS RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Neurgaonkar,R R ; Ho,W W ; Hall,W F

PDF Url : ADA114063

Report Date : Apr 1982

Pagination or Media Count : 27

Abstract : Single crystals of Sr2KNb5015 (SKN), approximately 5-8 mm in diameter and 10-20 mm long, have successfully been grown by the Czochralski technique. The crystal has ferroelectric tetragonal tungsten bronze structure with a curie temperature of about 150 C. The dielectric and electromechanical coupling constants for this crystal have been established: the polar axis dielectric constant, K33 exceeds 20,000 at the curie temperature while the coupling constants are k33 = 0.52 and k31 = 0.19, respectively. High frequency dielectric properties of SKN samples were also determined between 90-100 GHz. These measurements indicated that the bulk of the polar axis permittivity has relaxed below 90 GHz, implying that the low frequency dielectric response is not soft-mode controlled. (Author)

Descriptors :   *Crystal growth, *Dielectric properties, *Ferroelectric materials, Czochralski crystals, Single crystals, Low frequency, High frequency, Relaxation, Strontium compounds, Niobates, Potassium compounds, Tungsten alloys, Bronze, Curie temperature, Constants, Coupling(Interaction)

Subject Categories : Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE