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

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 0.28:0.72 molar BaO:CuO 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 (1.85)Ce(0.15)CuO4 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.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1991
Accession Number
ADA243221

Entities

People

  • C. K. Lowe-ma
  • D. E. Bliss
  • M. S. Osofsky
  • M. W. Decker
  • T. A. Vanderah

Organizations

  • Naval Air Weapons Station China Lake

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Annealing
  • Ceramic Materials
  • Chemistry
  • Copper
  • Crystal Growth
  • Crystals
  • Diffraction
  • Diffractometers
  • Materials
  • Military Research
  • Oxygen
  • Single Crystals
  • Temperature Gradients
  • Two Dimensional
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology