Glass Formability of High T(sub C) Bi-Sr-Ca-Cu-O Superconductors
Glass Formability of High T(sub C) Bi-Sr-Ca-Cu-O Superconductors

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-08-20

Total Pages: 32

ISBN-13: 9781722258627

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A number of compositions of ceramic oxide high T(sub c) superconductors were evaluated for their glass formation ability by means of rapid thermal analysis during quenching, optical and electron microscopy of the quenched samples, and with subsequent DSC measurements. Correlations between experimental measurements and the methodical composition changes identified the formulations of superconductors that can easily form glass. The superconducting material was first formed as a glass, then with subsequent devitrification it was formed into bulk crystalline superconductor by a series of processing methods. Kaukler, William F. Unspecified Center NAG8-152...

Superconducting Glass-ceramics in Bi-Sr-Ca-Cu-O
Superconducting Glass-ceramics in Bi-Sr-Ca-Cu-O

Author: Yoshihiro Abe

Publisher: World Scientific

Published: 1997

Total Pages: 320

ISBN-13: 9789810232047

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High c oxide superconductors such as Bi(Pb)-Sr-Ca-Cu-O (BSCCO) and Y-Ba-Cu-O (YBCO) systems are usually fabricated by sintering given mixtures of raw materials. Generally, sintering processing takes a longer heating time and the products are mechanically low strength and cannot be formed into complex shapes such as a coil, a curved fine tube or a fine rod. Another way to produce the ceramics is a glass-ceramic process in which the glasses prepared by melt-quenching are reheated for crystallization. A given mixture of raw materials in BSCCO is easily melted and quenched to form a given shape of glass, while that in YBCO is not glassified.This invaluable book has been written by authors from five countries. It presents a unique way to fabricate superconducting ceramics in BSCCO by glass-ceramic processing.

Preparation of Bi-Sr-Ca-Cu-O Superconductors from Oxide-glass Precursors
Preparation of Bi-Sr-Ca-Cu-O Superconductors from Oxide-glass Precursors

Author:

Publisher:

Published: 1992

Total Pages:

ISBN-13:

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A superconductor and precursor therefor from oxide mixtures of Ca, Sr, Bi and Cu. Glass precursors quenched to elevated temperatures result in glass free of crystalline precipitates having enhanced mechanical properties. Superconductors are formed from the glass precursors by heating in the presence of oxygen to a temperature below the melting point of the glass.

High Temperature Crystalline Superconductors from Crystallized Glasses
High Temperature Crystalline Superconductors from Crystallized Glasses

Author:

Publisher:

Published: 1992

Total Pages:

ISBN-13:

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A method of preparing a high temperature superconductor from an amorphous phase. The method involves preparing a starting material of a composition of Bi.sub. 2 Sr.sub. 2 Ca.sub. 3 Cu.sub. 4 Ox or Bi.sub. 2 Sr.sub. 2 Ca.sub. 4 Cu.sub. 5 Ox, forming an amorphous phase of the composition and heat treating the amorphous phase for particular time and temperature ranges to achieve a single phase high temperature superconductor.

Optimization of the Processing Parameters of High Temperature Superconducting Glass-Ceramics
Optimization of the Processing Parameters of High Temperature Superconducting Glass-Ceramics

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-08-20

Total Pages: 24

ISBN-13: 9781722464851

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A number of promising glass forming compositions of high Tc superconducting Ba-Sr-Ca-Cu-O (BSCCO) materials were evaluated for their glass-ceramic crystallization ability. The BSCCO ceramics belonging to the class of superconductors in the Ba-Sr-Ca-Cu-O system were the focus of this study. By first forming the superconducting material as a glass, subsequent devitrification into the crystalline (glass-ceramic) superconductor can be performed by thermal processing of the glass preform body. Glass formability and phase formation were determined by a variety of methods in another related study. This study focused on the nucleation and crystallization of the materials. Thermal analysis during rapid cooling aids in the evaluation of nucleation and crystallization behavior. Melt viscosity is used to predict glass formation ability. Ethridge, E. C. and Kaukler, W. F. Marshall Space Flight Center ...