Melt Processed High Temperature Superconductors

By: Masato Murakami (Editor)

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Hardcover | 1 January 1993

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Hardcover
380 Pages

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22.56 x 16.26 x 2.31

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The achievement of large critical currents is critical to the applications of high-temperature superconductors. Recent developments have shown that melt processing is suitable for producing high Jc oxide superconductors. Using magnetic forces between such high Jc oxide superconductors and magnets, a person could be levitated.This book has grown largely out of research works on melt processing of high-temperature superconductors conducted at ISTEC Superconductivity Research Laboratory. The chapters build on melt processing, microstructural characterization, fundamentals of flux pinning, critical current, and applications of bulk monolithic superconductors. The text also describes the basic mechanism of levitation and its application. This book will be useful for research workers, engineers, and graduate students in the field of superconductivity.List of Authors: H Fujimoto, S Gotoh, T Izumi; N Koshizuka, K Miya, M Murakami, N Nakamura, Y Nakamura, Y Shiohara, H Takaichi, T Taguchi, M Uesaka, H W Weber, K Yamaguchi.

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You Can Find This Book In

Non-Fiction Engineering & Technology Electronics & Communications Engineering Electronics Engineering Electronic Devices & Materials Semi-Conductors & Super-Conductors Science Physics Materials & States of Matter Condensed Matter Physics including Liquid State & Solid State Physics Electricity Energy Technology & Engineering

Electrical Engineering Mechanical Engineering & Materials Materials Science Booktopia Publisher Services World Scientific Publishing

Introduction
Critical temperature and critical current
Sintering
Effect of sintering condition on J[subscript c]
Weak links in sintered samples
Grain alignment
Applications
Melt processed superconductors
Phase Diagram of the Y-Ba-Cu-O System
Sample preparation
Microstructural analysis
Pseudobinary phase diagram
Melt Processing
MTG process
Modified MTG process
QMG and MPMG processes
Power melting process
Platinum doped melt growth process
Solidification with sample transport
Grain growth
Beneficial points of the MPMG process
Modified MPMG process
Seeding
Other melt processes
Crystal Growth
Directional solidification
Solidification models
Microstructure
Microstructure of melt processed samples
Observation of oxygen deficient regions
Microstructural characterization by transmission electron microscopy
Magnetic Properties I: DC Magnetization
DC magnetization at low fields
Magnetization hysteresis loops
Magnetic Properties II: AC Magnetization
Samples and measurements
Temperature dependence of AC susceptibility
Analysis of [chi] and [chi [superscript '']] based on the Bean model
Magneto-Optical Observation
Optical detection system
Experimental
Results on MPMG-processed YBCO
Results on QMG-processed YBCO
Role of 211 inclusions
Critical Current
Factors to affect critical currents
Critical current in type I superconductor
Critical current in type II superconductor
Critical current measurements
Flux Pinning I
Pinning mechanism
Flux pinning sites in melt processed YBaCuO
Flux Pinning II: Y[subscript 2]BaCuO[subscript 5] Inclusion
Comparison of critical currents
The size of the pinning center
211/123 interface
The bulk pinning force and J[subscript c]
Scaling law
Direct observations
Flux Pinning III: Fast Neutron Irradiation
Neutron irradiation of single crystals and thin films
Neutron irradiation of melt processed materials
Flux Creep and Irreversibility Line
Flux creep and J[subscript c]
Time decay of critical current
Flux creep measurements for the MPMG processed samples
Irreversibility line
Levitation and Suspension
Force between a superconductor and a magnet
Appendix: Calculation of the levitation force
Fracture Toughness
Fracture toughness of ceramics
Fracture toughness of YBa[subscript 2]Cu[subscript 3]O[subscript 7]-[delta]
Effect of Y[subscript 2]BaCuO[subscript 5] on fracture toughness
Effect of other second phases on fracture toughness
Application I: Levitation and Suspension
Flux jump
Levitation
Suspension
Application II: Magnetic Bearing and Flywheel
Superconducting magnetic bearing
Flywheel system using bulk superconductors
Application III: Permanent Magnet
Superconducting permanent magnet
Samples and experiments
Permanent magnetic properties of the melt processed YBCO
Appendix: Electromagnetic Units
The MKSA system
The CGS system
Subject Index
Table of Contents provided by Blackwell. All Rights Reserved.

Melt Processed High Temperature Superconductors

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