Accession Number : ADA265749

Title :   Study of Improved Critical Currents and Mechanical Properties in YBaCuO Superconductor w/Ag or 211.

Descriptive Note : Annual rept. 1 Apr 92-31 Mar 93,

Corporate Author : TRUSTEES OF COLUMBIA UNIV NEW YORK

Personal Author(s) : Chan, Siu-Wai

Report Date : APR 1993

Pagination or Media Count : 32

Abstract : The microstructure of the melted textured bulk YBCO materials with different vol% 211 were investigated. The homogeneity of 211 distribution was greatly improved by using a solution precipitated 211 powder in preparation. Crack spacings, were found to decrease with increasing vol% of the 211 particles. The 211 particles were found to be effective in holding crack propagation. Hardness and toughness measurements will be performed. The measured critical current density in high fields in epitaxial thin films of YBCO were compared with both the flux pinning and pair breaking models. This work was published Nov, 92. High quality YBCO films were grown on spinel and garnet. These substrate materials can interface between the superconducting and semiconducting materials for novel devices. This paper was submitted to APL.... Superconductors, Critical currents, Dispersions, Thin films, Flux-pinning.

Descriptors :   *CRACK PROPAGATION, *MICROSTRUCTURE, *SUPERCONDUCTORS, CURRENT DENSITY, DISPERSIONS, DISTRIBUTION, GARNET, HARDNESS, HOMOGENEITY, INTERFACES, MATERIALS, MODELS, PARTICLES, POWDERS, SPINEL, SUBSTRATES, THIN FILMS, TOUGHNESS.

Subject Categories : Electrical and Electronic Equipment
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE