NDLI: Development of high tc (greater than 110k) bi, tl and y-based materials as superconducting circuit elements

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Development of high tc (greater than 110k) bi, tl and y-based materials as superconducting circuit elements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Grabert, Gregory Gilmour, Phillip Haertling, Gene
Copyright Year	1991
Description	Experimental work was continued on the development and characterization of bulk and hot pressed powders and tapecast materials in the Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems. A process for producing warp-free, sintered, superconducting tapes of Bi composition Bi1Sr2Ca2 Cu3O(x) was established. The procedure requires a triple calcination at 830 C for 24 hours and sintering at 845 C from 20 to 200 hours. Hot pressing the triple calcined powder at 845 C for 6 hours at 5000 psi yielded a dense material, which on further heat treatment at 845 C for 24 hours, exhibited a Tc of 108.2K. The Bi compositions were found to be much less oxygen sensitive than the Y compositions. This was especially noted in the case of the hot pressed materials which were superconducting as hot pressed, a condition that could not be achieved in the Y compositions. Safire-type grounding links are in the process of being fabricated from these materials.
File Size	1492160
Page Count	45
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920002684
Archival Resource Key	ark:/13960/t9k40q11j
Language	English
Publisher Date	1991-11-11
Access Restriction	Open
Subject Keyword	Solid-state Physics Oxygen Heat Treatment Circuits Superconductivity Bismuth Oxides Thallium Compounds Powder Particles Electrical Grounding Fabrication Hot Pressing Calcium Oxides Superconductors Materials Sintering Barium Oxides Strontium Compounds Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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