Interfacial Layer Effects in Ba(1-x)Sr(x)TiO3 Thick Films Prepared by Plasma Spray

Abstract

The dielectric properties of high k dielectric thick films prepared by thermal spray were investigated. BaTiO3 and Ba(0.68)Sr(0.32)TiO3 thick films were deposited using plasma spray on Ag-Pd screen-printed alumina substrates. The sprayed films were predominantly polycrystalline but contained an amorphous second phase. The dielectric constants of the films decreased with decreasing film thickness in 10 approx. 60 micrometer range. This was attributed to the presence of an interfacial layer between the film and the substrate as determined by capacitance measurements. The capacitance density of the interfacial layer was determined to be approx. 2.7 nF/sq cm. The capacitance density of the interfacial layer increased to 12 nF/sq cm after post heat treatment at 500 deg. C for 20 hours.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2003
Accession Number
ADP014222

Entities

People

  • Bruce W Wessels
  • Kipyun Ahn
  • Sanjay Sampath

Organizations

  • Northwestern University

Tags

DTIC Thesaurus Topics

  • Capacitance
  • Capacitors
  • Dielectric Films
  • Dielectric Permittivity
  • Dielectric Properties
  • Dielectrics
  • Diffraction
  • Engineered Materials
  • Films
  • Heat Energy
  • Heat Treatment
  • Materials
  • Materials Processing
  • Materials Science
  • Thick Films
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Surface Engineering/Surface Coating Technology.