Research on Millimeter Wave Dielectric Materials.

Abstract

Much of the early effort in this program was devoted to single crystal strontium barium niobate (SBN), a tungsten bronze with an unusually large room-temperature dielectric response. More recently, other tungsten bronzes such as potassium lithium niobate (KLN) and barium strontium potassium sodium niobate (BSKNN) have been prepared and studied to elucidate the role of unfilled crystallographic sites in influencing dielectric loss. Currently, we are developing preparation techniques for morphotropic phase boundary (MPB) bronzes, such as lead barium niobate (PBN), which should exhibit exceptionally large nonlinear electrical and optical response for a Pb:Ba ratio of 60:40, where it undergoes a transition from tetragonal to orthorhombic form. Large, high quality BSKNN single crystals have now been developed for free-space millimeter wave measurements. Measurements on BSKNN and SBN at room and cryogenic temperatures are reported, and a theoretical model has been successfully formulated for the dielectric response. Low frequency data are also presented for a new orthorhombic bronze, SCNN, which shows high suitability for millimeter wave development.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1986
Accession Number
ADA173017

Entities

People

  • J. R. Oliver
  • R. R. Neurgaonkar

Tags

DTIC Thesaurus Topics

  • Ceramic Materials
  • Crystal Structure
  • Crystals
  • Curie Temperature
  • Dielectric Permittivity
  • Dielectric Properties
  • Dielectrics
  • Diffraction
  • Ferroelectric Materials
  • Materials
  • Optical Properties
  • Phase Diagrams
  • Phase Transformations
  • Piezoceramics
  • Refractive Index
  • Transition Temperature
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.

Technology Areas

  • 5G
  • Space