Effect of Lead Oxide and Titania on the Structure, Morphology and Superconductivity of Y-Ba-Cu-O Ceramic Materials

Abstract

The effect of the addition of PbO and TiO2, in the concentration range 0 15 wt.%, on crystal structure, morphology and superconductivity of YBa2CU306+X was investigated. The results suggest that the addition of either TiO2 or PbO (for PbO concentration above 3 wt.%) reduces the primary particle size of YBa2CU306+X. Both TiO2 and PbO tends to stabilize the non superconducting tetragonal phase at the expense of superconducting orthorhombic phase of YBa2CU306+X. The orthorhombic - tetragonal phase transformation appears to be related to the additive induced oxygen depletion of YBa2CU306+X to form Y2BaCuOy. Such a phase transformation-process not only increases the normal state resistance of the superconductor, but also lowers the superconducting transition temperature.

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Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1992
Accession Number
ADA248706

Entities

People

  • A. S. Rao

Organizations

  • Naval Surface Warfare Center Carderock Division

Tags

DTIC Thesaurus Topics

  • Ceramic Materials
  • Ceramic Matrix Composites
  • Chemical Reactions
  • Composite Materials
  • Copper Oxides
  • Crystal Structure
  • Diffraction
  • Electrical Properties
  • Grain Size
  • High Temperature
  • Materials
  • Materials Engineering
  • Measurement
  • Particle Size
  • Transition Temperature
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Powder metallurgy of Titanium alloys.
  • Superconducting Magnet Technology