Accession Number:

ADA248706

Title:

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

Descriptive Note:

Interim rept. Oct 1990-Sep 1991,

Corporate Author:

NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SHIP MATERIALS ENGINEERING DEPT

Personal Author(s):

Report Date:

1992-01-31

Pagination or Media Count:

21.0

Abstract:

The effect of the addition of PbO and TiO2, in the concentration range 0 15 wt., on crystal structure, morphology and superconductivity of YBa2CU306X 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 YBa2CU306X. Both TiO2 and PbO tends to stabilize the non superconducting tetragonal phase at the expense of superconducting orthorhombic phase of YBa2CU306X. The orthorhombic - tetragonal phase transformation appears to be related to the additive induced oxygen depletion of YBa2CU306X 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.

Subject Categories:

  • Physical Chemistry
  • Ceramics, Refractories and Glass
  • Electricity and Magnetism
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE