Document Type
Article
Publication Date
1992
Journal or Book Title
Journal of Materials Research
Volume
7
Issue
8
First Page
2035
Last Page
2039
DOI
10.1557/JMR.1992.2035
Abstract
Reactions with alumina and platinum crucibles were studied during the preparation of Bi2Sr2Ca1Cu2Oy “2212” glasses. In particular, reactions with Al2O3 are of interest since alumina is a potential substrate material in applications of this superconductor. Glasses processed using alumina crucibles were completely homogeneous and free of secondary phases although the material contained 2.26 at. % Al in solution. After heat treatments, Al was found in the form of SrCaAlOy particles located primarily along grain boundaries of the 2212 superconducting phase. Platinum contamination was minimal (14−xCaxCu24O41, and 2201 as second phases. Differential thermal analysis (DTA) suggested that the crystallization processes were essentially the same for all samples although the small amount of Al seemed to slow the kinetics leading to the formation of 2212. Neither Al nor Pt was detected within the 2212 phase. The measured superconducting compositions in each annealed sample were nearly the same with identical transition temperatures of 88 K. Overall differences in stoichiometry were accommodated by changes in the number and composition of the secondary phases present.
Copyright Owner
Materials Research Society
Copyright Date
1992
Language
en
File Format
application/pdf
Recommended Citation
Holesinger, T. G.; Miller, D. J.; Fleshler, S.; and Chumbley, L. S., "Processing of Bi–Sr–Ca–Cu–O glasses using platinum and alumina crucibles" (1992). Materials Science and Engineering Publications. 125.
https://lib.dr.iastate.edu/mse_pubs/125
Comments
This articles is from Journal of Materials Research 7 (1992): 2035-2039, doi: 10.1557/JMR.1992.2035. Posted with permission.