A Method for Simultaneously Enhancing the Transition Temperature and Increasing Mechanical Strength of Yttrium Barium Copper Oxide (YBa2Cu4O8).

Abstract

Y124 can be heated to 850 deg C without serious O2 loss, and also Y123 loses O2 from its structure at temperatures above 400 deg C. Partial substitution of Ca for Y and of Li for Cu raised the transition temperature (Tc) and enhanced sintering in Y1Ba2Cu4O8. We measured the critical temperature by two methods; a microwave technique (RF) which measures the surface resistivity at 35 GHz, and an AC technique which measures the magnetic screening provided by the whole sample. Twelve samples of Y124 or Y1-zCazBa2Cu4-xLixO8 were prepared; a summary is presented. It is desirable to have a thin film of Y124 for device applications; we have not been successful at this endeavor. (AN)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1995
Accession Number
ADA296126

Entities

People

  • Arthur Tauber
  • Herbert A. Leupold
  • Robert D. Finnegan
  • Steven C. Tidrow
  • William D. Wilber

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Weapons Technologies

DTIC Thesaurus Topics

  • Barium
  • Boron Carbides
  • Ceramic Materials
  • Copper
  • Copper Oxides
  • Critical Temperature
  • Films
  • Information Processing
  • Materials
  • Military Research
  • Oxides
  • Phase Transformations
  • Thin Films
  • Transition Temperature
  • Transitions
  • Yttrium
  • Yttrium Barium Copper Oxides

Readers

  • Superconducting Magnet Technology
  • Systems Analysis and Design
  • Thermal Physics or Thermal Science.