Spatial variations in composition in high-critical-current-density Bi-2223 tapes
Creators
- 1. MST-6, Metallurgy Group, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- 2. American Superconductor Corporation, Westborough, Massachusetts 01581 (United States)
Description
A detailed compositional analysis of high-critical-current-density (Jc) (55 and 65 kA/cm2 at 77 K) (Bi, Pb)2Sr2Ca2Cu3Oy (Bi-2223) tapes was undertaken by energy dispersive spectroscopy in the transmission electron microscope. Structural features were coupled with characteristic compositions of the Bi-2223 phase. The average of all compositional measurements of the Bi-2223 phase was determined to be Bi1.88Pb0.23Sr1.96Ca1.95Cu2.98Oy. However, spatial variations in the Bi-2223 composition and differing phase equilibria were found throughout the filament structure. In particular, a considerable range of Bi-2223 compositions can be found within a single tape, and the lead content of the Bi-2223 phase is significantly depressed in the vicinity of lead-rich phases. The depletion of lead in the Bi-2223 phase around the 3221 phases may be a current-limiting microstructure in these tapes. (c) 2000 Materials Research Society
Additional details
Publishing Information
- Journal Title
- Journal of Materials Research
- Journal Volume
- 15
- Journal Issue
- 2
- Journal Page Range
- p. 285-295
- ISSN
- 0884-2914
- CODEN
- JMREEE
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 32059715
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- BISMUTH OXIDES; CALCIUM OXIDES; CHEMICAL COMPOSITION; COPPER OXIDES; CRITICAL CURRENT; EXPERIMENTAL DATA; HIGH-TC SUPERCONDUCTORS; LEAD OXIDES; MICROSTRUCTURE; PHASE STUDIES; STRONTIUM OXIDES; SUPERCONDUCTING FILMS
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CURRENTS; DATA; ELECTRIC CURRENTS; FILMS; INFORMATION; LEAD COMPOUNDS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS
- Proposed descriptors and Free-text terms
- superconducting tapes; high-temperature superconductors; crystal microstructure; critical currents