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Title: Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Annual Report, 7 Mar. 1990 - 21 Feb. 1991

Abstract

This report is presented in two parts. Part 1 deals primarily with Bi-based materials and a small amount of work on a Y-based composition while Part 2 covers work on Tl-based materials. In Part 1, a reliable and reproducible process for producing bulk bismuth-based superconductors has been developed. It is noted however, that a percentage of the tapecast material experiences curling and fracturing after a 30 hour sintering period and is thus in need of further examination. The Bi-Sr-Ca-Cu-O (BSCCO) material has been characterized by critical temperature data, X-ray diffraction data, and surface morphology. In the case of T sub c, it is not critical to anneal the material. It appears that the BSCCO material has the possibility of producing a better grounding strap than that of the 123 material. Attempts to reproduce near room temperature superconductors in the Y-Ba-Cu-O system were unsuccessful. In Part 2, several methods of processing the high temperature superconductor Tl2Ba2Ca2Cu3O10 were investigated; i.e., different precursor compositions were sintered at various sintering times and temperatures. The highest superconductig temperature was found to be 117.8K when fired at 900 C for three hours. Higher sintering temperatures produced a melted sample which was nonsuperconducting at liquid nitrogen temperature.more » Also, a preliminary study found Li2O substitutions for copper appeared to increase the transition temperature and create fluxing action upon sintering. It was suggested that lower sintering temperatures might be obtained with lithium additions to produce reliable Tl2Ba2Ca2Cu3O10 processing methods.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Clemson Univ., SC (United States)
OSTI Identifier:
5341040
Report Number(s):
N-91-26948; NASA-CR-188581; NAS-1.26:188581
CNN: NAG1-1108
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; CRITICAL TEMPERATURE; FABRICATION; BISMUTH OXIDES; CALCIUM OXIDES; COPPER OXIDES; CURRENT DENSITY; LITHIUM OXIDES; MORPHOLOGY; SINTERING; STRONTIUM OXIDES; TEMPERATURE EFFECTS; THALLIUM OXIDES; YTTRIUM OXIDES; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; LITHIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; THALLIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; YTTRIUM COMPOUNDS; 360603* - Materials- Properties

Citation Formats

Haertling, G H, Lee, B, Grabert, G, and Gilmour, P. Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Annual Report, 7 Mar. 1990 - 21 Feb. 1991. United States: N. p., 1991. Web.
Haertling, G H, Lee, B, Grabert, G, & Gilmour, P. Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Annual Report, 7 Mar. 1990 - 21 Feb. 1991. United States.
Haertling, G H, Lee, B, Grabert, G, and Gilmour, P. 1991. "Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Annual Report, 7 Mar. 1990 - 21 Feb. 1991". United States.
@article{osti_5341040,
title = {Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Annual Report, 7 Mar. 1990 - 21 Feb. 1991},
author = {Haertling, G H and Lee, B and Grabert, G and Gilmour, P},
abstractNote = {This report is presented in two parts. Part 1 deals primarily with Bi-based materials and a small amount of work on a Y-based composition while Part 2 covers work on Tl-based materials. In Part 1, a reliable and reproducible process for producing bulk bismuth-based superconductors has been developed. It is noted however, that a percentage of the tapecast material experiences curling and fracturing after a 30 hour sintering period and is thus in need of further examination. The Bi-Sr-Ca-Cu-O (BSCCO) material has been characterized by critical temperature data, X-ray diffraction data, and surface morphology. In the case of T sub c, it is not critical to anneal the material. It appears that the BSCCO material has the possibility of producing a better grounding strap than that of the 123 material. Attempts to reproduce near room temperature superconductors in the Y-Ba-Cu-O system were unsuccessful. In Part 2, several methods of processing the high temperature superconductor Tl2Ba2Ca2Cu3O10 were investigated; i.e., different precursor compositions were sintered at various sintering times and temperatures. The highest superconductig temperature was found to be 117.8K when fired at 900 C for three hours. Higher sintering temperatures produced a melted sample which was nonsuperconducting at liquid nitrogen temperature. Also, a preliminary study found Li2O substitutions for copper appeared to increase the transition temperature and create fluxing action upon sintering. It was suggested that lower sintering temperatures might be obtained with lithium additions to produce reliable Tl2Ba2Ca2Cu3O10 processing methods.},
doi = {},
url = {https://www.osti.gov/biblio/5341040}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1991},
month = {Sat Jun 01 00:00:00 EDT 1991}
}

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