Accession Number:

ADA243221

Title:

Growth of Near-Free-Standing YBa2Cu3O7-Type Crystals Using a Self- Decanting Flux Method

Descriptive Note:

Technical rept. no. 1, Oct 1990-Apr 1991,

Corporate Author:

NAVAL WEAPONS CENTER CHINA LAKE CA

Report Date:

1991-05-01

Pagination or Media Count:

35.0

Abstract:

Large Multi-millimeter-sized near-free-standing platelets of YBa2Cu3OX have been obtained using a self-decanting flux method. The charge composition consists of 10.2 wt YBa2Cu3O7 in a 0.280.72 molar BaOCuO flux- mixture induced to decant by a thermal gradient. After oxygen annealing, crystals display sharp Tc values near 92 K. Crystals of ten of the RBa2Cu3Ox congeners, R Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, And Yb, were also grown using the method described. Preliminary experiments were successful in adapting the procedure to the Nd 1.85Ce0.15CuO4 system and yielded small, superconducting Tc 20 K platelets after Ar-annealing. For the YBa2Cu3Ox system, an oxygen annealing study was conducted in order to determine the best conditions for the reliable production of crystals with optimized superconducting properties.

Subject Categories:

  • Crystallography
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE