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The series Bi2Sr2Ca(n-1) Cu(n)O(2n+4) (1 less than or equal to n less than or equal to 5): Phase stability and superconducting propertiesPhase relations at 850 and 870 C, melting transitions in air, oxygen, and helium were studied for Bi(2.1)Sr(1.9) CuO6 and for the Bi2Sr2Ca(n-1) Cu(n)O(2n+4) for n = 1, 2, 3, 4, 5, and infinity (CaCuO2). Up to 870 C, the n = 2 composition resides in the compatibility tetrahedron bounded by Bi(2+x)(Sr,Ca)(3-y) Cu2O8, (Sr,Ca)14 Cu24O41, Ca2CuO3, and a Bi-Sr-Ca-O phase. The n is greater than or equal to 3 compositions reside in the compatibility tetrahedron Bi(2+x)(Sr,Ca)(3-y) Cu2O8 - (Sr,Ca)14 Cu24O41 - Ca2CuO3 - CuO up to 850 C. However, Bi(2+x)Sr(4-y) Cu3O10 forms for n is greater than or equal to 3 after extended heating at 870 C. Bi(2+x)Sr(2-y) CuO6 and Bi(2+x)(Sr,Ca)(3-y) Cu2O8 melt in air at 914 C and 895 C respectively. During melting, all of the compositions studied lose 1 to 2 percent by weight of oxygen from the reduction of copper. Bi(2+x)Sr(2-y) CuO6, Bi(2+n)(Sr,Ca)(3-y) Cu2O8, and Bi(2+x)(Sr,Ca)(4-y) Cu3O10 exhibit crystallographic alignment in a magnetic field, with the c-axes orienting parallel to the field.
Document ID
19910012597
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Deguire, Mark R.
(Case Western Reserve Univ. Cleveland, OH., United States)
Bansal, Narottam P.
(NASA Lewis Research Center Cleveland, OH., United States)
Farrell, David E.
(Case Western Reserve Univ. Cleveland, OH., United States)
Finan, Valerie
(Case Western Reserve Univ. Cleveland, OH., United States)
Kim, Cheol J.
(Case Western Reserve Univ. Cleveland, OH., United States)
Hills, Bethanie J.
(Case Western Reserve Univ. Cleveland, OH., United States)
Allen, Christopher J.
(Case Western Reserve Univ. Cleveland, OH., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1989
Subject Category
Solid-State Physics
Report/Patent Number
E-6000
NASA-TM-103749
NAS 1.15:103749
Report Number: E-6000
Report Number: NASA-TM-103749
Report Number: NAS 1.15:103749
Meeting Information
Meeting: Annual Meeting of the American Ceramic Society
Location: Indianapolis, IN
Country: United States
Start Date: April 23, 1989
End Date: April 27, 1989
Accession Number
91N21910
Funding Number(s)
PROJECT: RTOP 307-51-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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