Microstructure and Properties of High-Temperature Superconductors

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Springer Science & Business Media, Sep 6, 2007 - Technology & Engineering - 586 pages
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An intrinsic brittleness of oxide cuprates, the layered anisotropic structure and the supershort coherence length are the main features of HTS defining their properties. Taking into account these features, the researching of HTS microstructure and properties is presented, and also the possibilities of optimization of the preparation techniques and superconducting compositions are considered. The link "composition-technique-experiment-theory-model" investigated in the book, assuming considerable HTSC defectiveness and structure heterogeneity, forms whole picture of modern representations on the microstructure, strength and connected with them the structure-sensitive properties of the materials considered. Especial attention is devoted in the book to the Bi-Sr-Ca-Cu-O and Y-Ba-Cu-O families, that today are most perspective for applications. The book includes great number of illustrations and references. The monograph is addressed to students, post-graduate students and specialists, taking part in the development, preparation and researching new materials.

 

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Contents

716 Multiphase Field Method
326
72 StressStrain State of HTSC in Applied Magnetic Fields
331
Computer Simulation of HTSC Microstructure and Toughening Mechanisms
337
812 Ceramic Cracking During Cooling
341
813 Formation of Microcracks Around 211 Particles in 123 Matrix
343
814 Fracture Features at External Loading
347
815 Microcracking Process Zone near Macrocrack
349
816 Crack Branching
353

143 Magnetic Properties of TypeII Superconductors
25
15 Theories of Superconductivity
26
16 HighTemperature Superconductors
33
162 Doping of Cuprates
35
163 Coherence Length and HTSC Anisotropy
39
164 Vortex Structure of HTSC and Magnetic Flux Pinning
42
165 Interactions of Vortices with Pinning Centers
47
17 Weak Links of Josephson Type
49
Composition Features and HTSC Preparation Techniques
53
22 BSCCO Films Tapes and Wires
63
23 Tapes and Wires Based on Thallium and Mercurial Cuprates
81
24 BSCCO Bulks
83
25 YREBCO Bulks
89
Experimental Investigations of HTSC
97
312 Acoustic Emission Method
105
32 Intergranular Boundaries in HTSC
114
33 Superconducting Composites Based on BSCCO
127
332 Irreversibility Lines for BSCCO
140
333 BSCCO Bulks
144
34 MeltProcessed YREBCO
151
342 Growth Processes in Seeded Sample
154
343 Behavior of 211422 Disperse Phase
158
344 Effects of Doping Additives
167
345 Mechanical and Strength Properties
171
Carbon Problem
183
42 BSCCO Systems
194
43 Carbon Embrittlement and Fracture of YBCO Superconductor
197
431 Mathematical Model for Carbonate Precipitation and Fracture
198
432 Discussion of Results
207
44 Modeling of Carbon Segregation and Fracture Processes of HTSC
209
442 SteadyState Crack Growth
213
443 Some Numerical Results
216
General Aspects of HTSC Modeling
219
51 Yield Criteria and Flow Rules for HTSC Powders Compaction
222
512 NonAssociated Plasticity of HTSC Powders
225
52 Void Transformations During Sintering of Sample
230
521 Void Separation from Intergranular Boundary
233
522 Size Trajectories in the PoreGrain Boundary System During Sintering
239
523 Estimation of Pore Separation Effects for HTSC
249
53 HTSC Microstructure Formation During Sintering
251
54 Microcracking of Intergranular Boundaries at Sample Cooling
256
55 Study of Statistical Properties of the Model Structures
259
56 Modeling of Macrocracks
261
Modeling of BSCCO Systems and Composites 61 Transformation of Bi2212 to Bi2223 Phase
269
611 Edge Dislocations as Channels for Fast Ion Diffusion
270
612 The LayerRigidity Model
272
613 Dynamics of Bi2223 Phase Growth
276
614 Formation Energy of Bi2223 Phase
278
615 Effect of Deformation on Bi2212Bi2223 Transformation
280
62 Modeling of Preparation Processes for BSCCOAg Tapes
283
622 Deformation at Tape Cooling
286
623 Effects of Mechanical Loading
287
624 FiniteElement Modeling of Deformation Processes
295
Modeling of YBCO Oxide Superconductors
300
713 Models Based on Interface Phenomena
309
714 Models of PlateletsLike Growth of 123 Phase
315
715 Modeling of Solidification Kinetics
323
817 Crack Bridging
355
818 Some Numerical Results
362
82 Twinning Processes in Ferroelastics and Ferroelectrics
369
821 Domain Structure and Fracture of Ferroelectric Ceramic
370
822 Fracture Features in Domain Structure of Ferroelectric
373
823 Thermodynamics of Martensitic Transformation in HTSC
377
824 About Toughening of Superconducting Ceramics
380
83 Toughening Mechanisms for LargeGrain YBCO
384
832 Effect of 211 Particles on YBCO Fracture
386
833 Some Numerical Results
390
84 Small Cyclic Fatigue of YBCO Ceramics
391
842 Microstructure Dissimilitude Effect
392
843 Fracture Energy and Microstructure Features
394
844 Some Numerical Results
397
85 Residual Thermal Stresses in YBCOAg Composite
398
86 Toughening of Bi2223 Bulk Fabricated by HotPressing Method
400
862 Bi2223 Toughening by Silver Dispersion
403
Mechanical Destructions of HTSC Josephson Junctions and Composites
406
91 Interface Fracture
408
92 Thin Films on Substrates
413
94 Transversal Fracture
420
95 HTSC Systems of SNS Type
424
96 Toughening Mechanisms
426
97 Charts of Material Properties and Fracture
428
98 Concluding Remarks
432
Modeling of Electromagnetic and Superconducting Properties of HTSC
435
102 CurrentLimiting Mechanisms and Grain Boundary Pinning
440
103 Vortex Structures and Current Lines in HTSC with Defects
443
104 NonLinear Current in Superconductors with Obstacles
448
105 Current Percolation and Pinning of Magnetic Flux in HTSC
457
1051 Model of Nonlinear Resistor Network
458
1052 Simulation of Current Percolation and Magnetic Flux in YBCO Coated Conductors
466
1053 Modeling of Electromagnetic Properties of BSCCOAg Tapes
469
1054 Aging at Mechanical Loading
474
1055 Effective Electrical Conductivity of Superconducting Oxide Systems
477
Classification of Superconductors
485
A2 A15 Compounds
486
A3 Magnetic Superconductors Chevrel Phases
488
A4 Heavy Fermion Superconductors
491
A5 Oxide Superconductors without Copper
492
A6 Pyrochlore Oxides
493
A8 HighTemperature Superconductors
494
A9 RareEarth Borocarbides
500
A11 Chalcogens
501
A13 MgB2 and Related Superconductors
504
A14 RoomTemperature Superconductivity
507
FINITE ELEMENT IMPLEMENTATION OF CARBONINDUCED EMBRITTLEMENT MODEL
508
Macrostructure Modeling of Heat Conduction
515
C2 Heat Conduction of Heterogeneous Systems
518
C22 Polystructural Model of Granular Material
520
C23 Model of Granular System with Chaotic Structure
523
C24 Heat Flux Through Averaged Element
526
Eden Model
531
References
534
Index
571
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Page viii - I would like to thank all those who have contributed to the preparation of this manuscript at final stage, especially Jacqueline Lenz and Dhivya Balarajan.
Page 539 - Institute on the Physics and Materials Science of Vortex States, Flux Pinning and Dynamics S.

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