Research on the Crystal Growth and Dielectric Properties of High Permittivity Ferroelectric Materials.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1982
- Accession Number
- ADA114063
Entities
People
- R. R. Neurgaonkar
- W. F. Hall
- W. W. Ho