Author: Andreas NilssonPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
BSCCO Superconductors Processed by the Glass Ceramic Route
Author: Andreas NilssonBSCCO Superconductors Processed by the Glass-ceramic Route
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Glassy Bi-Sr-Ca-Cu-O (BSCCO) precursors were prepared by different melt-quenching methods to investigate the melt properties of the BSCCO system before the crystallization investigations were started. In order to fabricate superconductors having high critical temperature and current density using the glass-ceramic route, it is necessary to clarify the total chemical composition of the quenched precursor. For the first time the total chemical composition of such precursors has been directly measured by the direct element analysis and correlated with the taken process steps. The results from the element analysis demonstrated significant chemical deviations in composition with respect to the starting composition and strong chemical inhomogeneities of the sample. The crystallization dependence was investigated on numerous parameters for the BSCCO system such as initial composition, atmosphere, Sr:Ca ratio, average valence state of the glassy precursor and the dependence of Bi substitution by Pb. It could be demonstrated that the copper valence dependence on the phase formation and crystallization of the high-TC phase plays an important role in the BSCCO system. It could also be demonstrated that the smallest chemical deviation could strongly influence the phase formation in dependence of melt temperature, influencing not only the average copper valence but also the different cation concentrations. From literature there are barely any results or conclusions drawn of the chemical composition of the quenched glassy precursors that however is critical to control the crystallization behavior and understanding the influences on the superconductive properties as demonstrated in this work.
Superconducting Glass-ceramics in Bi-Sr-Ca-Cu-O
Author: Yoshihiro AbePublisher: World Scientific
ISBN: 9789810232047
Category : Science
Languages : en
Pages : 320
Book Description
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.
Novel Compositional and Unusual Processing Approaches to High Temperature Ceramic Oxide Superconductors
Author: Chien-Hua ShanOptimization of the Processing Parameters of High Temperature Superconducting Glass-Ceramics
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722464851
Category :
Languages : en
Pages : 24
Book Description
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 ...
Optimization of the Processing Parameters of High Temperature Superconducting Glass-ceramics: Center Director's Discretionary Fund Final Report
Author: E. C. EthridgeProcessing of High-Temperature Superconductors at High Strain
Author: A.G. MamalisPublisher: CRC Press
ISBN: 1420014269
Category : Science
Languages : en
Pages : 268
Book Description
The discovery of high-temperature superconductivity [1986] by Bendnorz and Muller in the La-BA-Cu-O system resulted in very extensive research work about the discovery and synthesis of other high-temperature superconductors, such as Y-BA-Cu-O and Bi-Sr-Ca-Cu-O. These new superconducting materials, possessing superconductivity above liquid nitrogen
Studies of High-Temperature Superconductors - Advances in Research and Applications
Author: Anant NarlikarPublisher: Nova Publishers
ISBN: 9781590330258
Category : Science
Languages : en
Pages : 208
Book Description
Studies of High Temperature Superconductors, Volume 36 - The BSCCO System -- II
The BSCCO System
Author: A. V. NarlikarPublisher: Nova Publishers
ISBN: 9781560729358
Category : Science
Languages : en
Pages : 328
Book Description
This 35th volume of the 'Studies' is devoted to the technologically important BSCCO system. It focuses on a host of topics such as the synthesis and fabrication of conductors, superconducting BSCCO magnets, and the basic technological properties of the material in relation to the microstructure. The authors are distinguished in the field, working in different parts of the world, maintaining the international character of the series.
Author: