Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess:
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Jülich
Forschungszentrum, Zentralbibliothek
2011
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| Schriftenreihe: | Schriften des Forschungszentrums Jülich
Reihe Information ; Bd. 18 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | XXVII, 163 S. Ill., graph. Darst. 24 cm |
| ISBN: | 9783893367412 |
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| 245 | 1 | 0 | |a Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess |c Hayato Katsu. Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Elektronische Materialien (PGI-7) |
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| adam_text | IMAGE 1
TABLE OF CONTENTS
INDEX OF FIGURES XVII
INDEX ACRONYMS OF AND SYMBOLS XXII
1 GENERAL INTRODUCTION AND TECHNOLOGICAL RELEVANCE 1 1.1 PTC THERMISTORS
BASED ON BARIUM TITANATE 1
1.2 OBJECTIVE AND SCIENTIFIC APPROACH OF THE PRESENT STUDY 4
2 PHENOMENOLGY OF BATIO 3 BASED PTC THERMISTORS 6
2.1 TEMPERATURE CHARACTERISTICS OF RESISTIVITY 6
2.2 CHALLENGES OF MATERIAL DEVELOPMENT: PAST AND STATE OF THE ART 8
3 THEORETICAL BACKGROUND 11
3.1 CRYSTAL STRUCTURE OF THE FERROELECTRIC COMPOUND BATIO 3 11
3.2 DEFECT CHEMISTRY AND ELECTRICAL CONDUCTIVITY OF BATIO 3 15
3.2.1 THE KROEGER-VINK NOTATION 15
3.2.2 LATTICE DISORDER AND CONDUCTIVITY MECHANISMS 17
3.2.2.1 INTRINSIC REACTIONS 18
3.2.2.2 ACCEPTOR-DOPING 20
3.2.2.3 DONOR-DOPING 24
3.2.2.4 AMPHOTERIC DOPING 31
3.2.3 DEFECT CHEMICAL SIMULATIONS: OUTINE OF THE CALCULATION ALGORITHM
33
3.3 BASIC MODELS OF BARIUM TITANATE BASED PTCR CERAMICS 35
3.3.1 HEYWANG MODEL: SCHOTTKY-TYPE GRAIN BOUNDARY JUNCTIONS 35
3.3.2 JONKER MODEL: THE ROLE OF FERROELECTRIC DOMAINS 39
3.3.3 DANIEL MODEL: THE ROLE OF POINT DEFECTS 40
4 EXPERIMENTAL 43
4.1 POWDER SYNTHESIS AND CERAMIC PROCESSING 43
4.1.1 SOLID STATE REACTION AND SINTERING 45
4.1.2 MICROEMULSION MEDIATED SYNTHESIS AND PLASMA SPARK SINTERING 46
XIII
BIBLIOGRAFISCHE INFORMATIONEN HTTP://D-NB.INFO/1019045485
DIGITALISIERT DURCH
IMAGE 2
4.2 PHASE PURITY AND CRYSTAILOGRAPHIC CHARACTERIZATION 47
4.3 ANALYTICAL POWDER CHARACTERIZATION 48
4.4 MICROSTRUCTURAL CHARACTERIZATION 48
4.4.1 SAMPLE PREPARATION 48
4.4.2 ELECTRON MICROSCOPY 49
4.4.2.1 SCANNING ELECTRON MICROSCOPY (FE-SEM AND SEM) 49
4.4.2.2 TRANSMISSION ELECTRON MICROSCOPY (TEM) 49
4.4.2.3 ELECTRON BACKSCATTERED DIFFRACTION (EBSD) 49
4.5 IMPEDANCE SPECTROSCOPY 50
4.5.1 MEASUREMENTS 50
4.5.2 DATA ANALYSIS ACCORDING TO THE BRICK-WALL MODEL 51
4.5.3 EVALUATION OF IMPEDANCE SPECTRA AS COLE-COLE DIAGRAMS 52
4.5.3.1 ONE SINGLE PARALLEL RC COMPONENT 54
4.5.3.2TWO PARALLEL RC COMPONENTS IN SERIES 56
4.5.3.3 ONE PARALLEL RC COMPONENT IN SERIES WITH ONE RESISTOR 57
4.5.3.4 CONSTANT PHASE ELEMENT ANALYSIS 58
4.6 MEASUREMENTS OF DC CONDUCTIVITY 60
4.6.1 EXPERIMENTAL SET-UP 60
4.6.2 CONTROL OF OXYGEN PARTIAL PRESSURE 61
4.7 DETERMINATION OF 18 O DIFFUSION PROFILES 64
4.8 OPTICAL CHARACTERIZATION 65
5 PTCR CERAMICS BASED ON BATIO 3 WITH BAO-EXCESS 67
5.1 MICROSTRUCTURE, PHASE PURITY AND CRYSTALLOGRAPHY 67
5.2 ORIGIN OF THE PTCR EFFECT IN VIEW OF IMPEDANCE SPECTROSCOPY 74
5.2.1 INFLUENCE OF BAO-EXCESS ON THE TOTAL RESISTIVITY 74
5.2.2 IMPEDANCE SPECTRA AND MODELED EQUIVALENT CIRCUITS 75
5.2.2.1 RESISTIVE COMPONENTS 75
5.2.2.2 CAPACITIVE COMPONENTS 80
5.2.3 INFLUENCE OF THE ELECTRODE-CERAMIC INTERFACE 81
5.2.4 VARIATION OF SAMPLE GEOMETRY 83
5.2.5 EFFECT OF THE REOXIDATION TREATMENT DURING ANNEALING 86
5.3 CHARACTERISTICS OF OXYGEN DIFFUSION DURING REOXIDATION 88
5.3.1 EXPERIMENTAL RESULTS 89
5.3.2 SIMULATION OF THE DIFFUSION PROFILES 90
5.3.2.1 THE ROLE OF VOLUME DIFFUSION 90
5.3.2.2 THE ROLE OF GRAIN BOUNDARY DIFFUSION 91
XIV
IMAGE 3
5.3.2.3 IMPACT OF DEFECT CHEMISTRY ON THE DIFFUSION BEHAVIOR 93
5.3.3 FACTORS ENHANCING GRAIN BOUNDARY DIFFUSION 96
5.3.3.1 DFT CALCULATION OF DIFFUSIVITY 97
5.3.3.2 QUANTITATIVE ESTIMATION OF OXYGEN ABSORPTION 99
5.4 SUMMARY 100
6 KROEGER-VINK DIAGRAMS AND DEFECT CHEMISTRY 101
6.1 SIMULATION OF DEFECT CHEMICAL EQUILIBRIA 102
6.2 EXPERIMENTAL RESULTS AND DISCUSSION 103
6.2.1 LOW BAO-EXCESS (M = 1.01) 105
6.2.2 HIGH BAO-EXCESS (M= 1.03, M =1.05) 106
6.2.3 THE INTRINSIC MINIMUM OF CONDUCTIVITY 109
6.3 P-TYPE CONDUCTIVITY AND ITS RELATION TO THE PTCR EFFECT 111
6.4 THE CASE OF NB-DOPED BATIO 3WITH BAO-EXCESS 114
6.5 THE MECHANISM OF THE PTCR EFFECT BASED ON DEFECT CHEMISTRY 115
6.6 SUMMARY 118
7 PTCR EFFECT IN ULTRAFINE GRAINED BATIO 3 CERAMICS 120
7.1 INTRODUCTION 120
7.2 MICROSTRUCTURAL AND ANALYTICAL CHARACTERIZATION 121
7.3 ELECTRICAL CHARACTERIZATION 125
7.4 DISCUSSION 127
7.4.1 STOICHIOMETRIC COMPOSTION 127
7.4.2 HYPER-STOICHIOMETRIC CASE WITH BAO-EXCESS 130
7.5 SUMMARY 131
8 OPTICALLY TRANSLUCENT HEAVILY LA-DOPED BATIO 3 CERAMICS 132
8.1 INTRODUCTION 132
8.2 ANALYTICAL AND MICROSTRUCTURAL CHARACTERIZATION 134
8.3 OPTICAL TRANSMITTANCE 137
8.4 DEFECT CHEMISTRY: CHARGE COMPENSATION MECHANISM 140
8.5 FERROELECTRIC PROPERTIES 142
8.6 OPTICAL REFLECTION 143
8.7 SUMMARY 146
XV
IMAGE 4
9 ANNEX 147
10 GENERAL CONCLUSION 151
LITERATURE 155
XVI
|
| any_adam_object | 1 |
| author | Katsu, Hayato |
| author_GND | (DE-588)1017986592 |
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| bvnumber | BV039867110 |
| ctrlnum | (OCoLC)780108977 (DE-599)DNB1019045485 |
| dewey-full | 537.2448 |
| dewey-hundreds | 500 - Natural sciences and mathematics |
| dewey-ones | 537 - Electricity and electronics |
| dewey-raw | 537.2448 |
| dewey-search | 537.2448 |
| dewey-sort | 3537.2448 |
| dewey-tens | 530 - Physics |
| discipline | Physik Allgemeine Naturwissenschaft |
| format | Thesis Book |
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| id | DE-604.BV039867110 |
| illustrated | Illustrated |
| indexdate | 2024-07-10T00:13:00Z |
| institution | BVB |
| isbn | 9783893367412 |
| language | English |
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| series2 | Schriften des Forschungszentrums Jülich : Reihe Information |
| spelling | Katsu, Hayato Verfasser (DE-588)1017986592 aut Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess Hayato Katsu. Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Elektronische Materialien (PGI-7) Jülich Forschungszentrum, Zentralbibliothek 2011 XXVII, 163 S. Ill., graph. Darst. 24 cm txt rdacontent n rdamedia nc rdacarrier Schriften des Forschungszentrums Jülich : Reihe Information Bd. 18 Zugl.: Aachen, Techn. Hochsch., Diss., 2011 (DE-588)4113937-9 Hochschulschrift gnd-content Schriften des Forschungszentrums Jülich Reihe Information ; Bd. 18 (DE-604)BV035800087 18 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024726530&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Katsu, Hayato Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess Schriften des Forschungszentrums Jülich |
| subject_GND | (DE-588)4113937-9 |
| title | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess |
| title_auth | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess |
| title_exact_search | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess |
| title_full | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess Hayato Katsu. Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Elektronische Materialien (PGI-7) |
| title_fullStr | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess Hayato Katsu. Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Elektronische Materialien (PGI-7) |
| title_full_unstemmed | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess Hayato Katsu. Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Elektronische Materialien (PGI-7) |
| title_short | Crystal- and defect-chemistry of fine grained thermistor ceramics on BaTiO3 basis with BaO-excess |
| title_sort | crystal and defect chemistry of fine grained thermistor ceramics on batio3 basis with bao excess |
| topic_facet | Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=024726530&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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| work_keys_str_mv | AT katsuhayato crystalanddefectchemistryoffinegrainedthermistorceramicsonbatio3basiswithbaoexcess |