Switching effects Franciszek Krok, Krystian Roleder, Krzysztof S. Szot

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Spis treści książki

Introduction 11 1. An Introduction to the Crystal Structures of Oxide Perovskites 13 1.1. Atomic Displacements 15 1.2. Octahedral Tilting 23 1.3. Distortion Modes 25 References 28 2. Growth of ABO3 and BO2 Crystals 30 2.1. Theory of Crystal Growth 30 2.1.1. Equilibrium Conditions 30 2.2. Phase Diagrams of Model Oxides. Major Challenges in Crystal Growth of Stoichiometric Oxide Crystals 33 2.2.1. Gibbs Phase Rule 33 2.2.2. Phase Diagrams 34 2.2.3. Nonstoichiometric Oxides 34 2.3. Techniques of Growth of Selected Binary and Ternary Oxide Crystals 35 2.4. Typical Methods for Evaluation of Quality of Oxide Crystals 40 2.4.1. Stoichiometric TiO2 41 2.4.2. Perovskite Structure 41 References 46 3. Defect Chemistry in Binary and Ternary Metal Oxides 51 3.1. Introduction 51 3.2. Imperfect Crystals 52 3.3. Quasi-chemical Defect Reactions 53 3.4. Types of Point Defects 54 3.5. Thermodynamic Approach 54 3.6. Nonstoichiometry 57 3.7. Aggregations of Point Defects and Extended Defects 58 3.8. Ideal Point Defect Model 61 3.8.1. Case of Ni1-yO 61 3.8.2. Case of BaTiO3-y 64 3.8.3. Case of Zirconia-based Materials 67 3.8.4. Defect Structure of YSZ 72 3.9. Debye-Hückel Defect Model 73 3.9.1. Co1-yO Case 73 3.10. Cluster Model 77 3.10.1. Defect Clustering in the Wustite Phase 77 3.11. Crystallographic Shearing 80 3.12. Defect Structure of Titanium Dioxide 81 3.12.1. Extended Defects in TiO2 85 3.13. Hydrogen Defects 86 Acknowledgements 87 References 87 4. Self-Polarization of Ferroelectric Thin Films and Its Influence on the Film Properties 92 4.1. Introduction 93 4.2. Free Energy Functional 94 4.3. Renormalized Free Energy and Properties for One Component Polarization P = PZ 96 4.4. The Influence of Built-in Electric Field on the Properties of Ferroelectric Thin Films for the Case P = PZ 99 4.5. Phase Diagrams with Electret State and Properties for the Case of Three Polarization Components 103 4.6. Comparison with Experiment and Summary of Sec. 5 Results 114 Conclusion 117 References 118 5. Lattice Dynamics of Perovskite Oxides 120 5.1. Introduction 120 5.2. Early Attempts to Model Ferroelectric Perovskites 121 5.3. Polarizability Effects in Perovskites 124 5.4. The Polarizability Model for Perovskites 126 5.5. Applications of the Model 131 5.6. Precursor Effects to the Phase Transitions 137 Conclusions 146 References 147 6. Metrology and Measurement Techniques 151 6.1. Electrical Properties of Nanoscale Solids 151 6.1.1. Measurement of Electrical and Magnetic Material Properties 152 6.1.2. The Piezoelectric Effect 163 6.2. Design of Measurement Setups 166 6.2.1. General Considerations 166 6.2.2. Active Amplifier Circuits 169 6.2.3. Measurement Methods for Ferroelectric Properties 172 6.2.4. Laser Interferometers 183 References 188 7. Multiferroics 190 7.1. Abstract 190 7.2. Introduction 190 7.3. A Brief History of Magnetoelectrics and Multiferroics 191 7.4. Symmetries and Orderings in Multiferroics 192 7.5. Theory of Magnetoelectric Coupling in Multiferroics 193 7.6. Magnetoelectric Multiferroics 200 Acknowledgements 218 References 218 8. Electronic Correlations and Metal-Insulator Transitions 223 8.1. Introduction: The Meaning of Localization - Delocalization Transitions in Solids with Examples 223 8.1.1. Crystallization of Liquid 3He as Mott-Hubbard Transition 223 8.1.2. Localization-Delocalization Transition of Ultracold Atoms 225 8.1.3. Metal-Insulator Transition in Doped V2O3 226 8.2. Elementary Approach to the Metal-Insulator (Mott-Hubbard) Transitions 228 8.2.1. Normal metal as a Landau Fermi liquid: basic characteristics 228 8.2.2. Mott-Wigner Criterion of Localization 230 8.2.3. 8.2.3 Localization on the Lattice: Hubbard Model 232 8.2.4. Quantitative Discussion of the Metal-Insulator Transition 233 8.2.5. Quasiparticle Representation of Correlated-Electron System and the Phase Diagram 236 8.2.6. Mott-Hubbard Localization in Correlated Nanoscopic Systems 241 8.3. Concluding Remarks 244 Acknowledgment 244 References 244 9. Nature of the Insulator-Metal Transition in Transition Metal Oxides Induced by Chemical Defects - Deviation from Stoichiometry and Electrochemical Alkaline Intercalation 245 9.1. Insulator-Metal Transition in Transition Metal Oxides Induced by Deviation from Stoichiometry 247 9.2. Insulator-Metal Transition in Transition Metal Oxides Induced by Electrochemical Alkaline Intercalation/Deintercalation 272 9.2.1. LixCoO2 276 9.2.2. NaxCoO2-y 285 Acknowledgements 295 References 296 10. Structural Transformation of the SrTiO3 Surface Region due to Electric Fields at Ambient Temperature 299 10.1. Modifications and Equilibrium of the SrTiO3 Structure 300 10.1.1. Compositional Changes: the Quasi-binary System SrO-TiO2 300 10.1.2. Stability of SrO(SrTiO3)n Ruddlesden-Popper Phases 303 10.1.3. A Look at Symmetry and Property Tensors 304 10.1.4. Chemical Modifications Beyond the Ternary Composition 306 10.2. Electric-field Induced Ionic Transport and Anisotropy in SrTiO3 307 10.2.1. Electroformation 308 10.2.2. Redistribution of Ionic Species 310 10.3. Evidence for Structural Transformations and Related Models 312 10.3.1. Structural Transitions due to Application of an Electric Field 312 10.3.2. The Occurence of Ruddlesden-Popper Phases 313 10.3.3. The Migration-Induced Field-Stabilized Polar (MFP) Phase 314 10.4. Modification of SrTiO3 Properties and Related Applications 317 10.4.1. Oxygen Vacancies and Conductivity 318 10.4.2. Mechanical Properties 319 10.4.3. Magnetism 321 10.4.4. Pyroelectricity 321 10.4.5. Piezoelectricity 323 10.4.6. Resistive Switching 325 10.4.7. All-Solid-State All-in-One Battery 326 10.4.8. Further Applications 326 10.5. Conclusion 327 Acknowledgment 328 References 329 11. Chemical Transformation of SrTiO3 Surface Region Exposed to High Temperature and Other Factors 336 11.1. Introduction 336 11.2. Investigated Crystals 339 11.3. Possible Surface Reconstructions of STO 340 11.4. Methods of Surface Studies 341 11.5. Thermal Treatment 341 11.6. Surface Modification upon Vacuum and Exposure to X-Rays and Electron Beam 348 11.7. Ion Sputtering 351 11.8. Deposition of Metals 354 11.9. Mechanical Stress and Defects 355 Summary 356 References 357 12. Chemical Transformation of TiO2 Surface Region Exposed to High Temperature and Different Chemical Activity of Oxygen 359 Acknowledgements 375 References 375 13. From Electroformation to Resistive Switching in Single Crystals of Strontium Titanate: How SrTiO3 Can Be Transformed into a Metallic State Using Electrical Stimuli 378 13.1. Introduction 378 13.2. Resistive Switching - General Information 381 13.3. Some Theoretical Considerations 386 13.3.1. Methods for the Calculation of the Electronic Structure 388 13.3.2. Trends Observed from DFT Calculations 393 13.4. Electroforming of Non-conducting (Insulating) SrTiO3 Crystals 394 13.4.1. Electrical Characterization During Electroformation 394 13.4.2. Oxygen Evolution During Electroformation 399 13.4.3. Spatial Inhomogeneity of the Electroformation Process and Filamentary Structures 402 13.5. Model 410 References 417 14. Crystallographic Structure, Electronic Structure, and Chemical Composition on the Nanoscale: Important Role of the SPM, LEED, Photoemission Investigations for the Analysis of the Crystal Geometry, Electronic Structure and Diffusion Phenomena on the Surface of Model Oxides 420 Acknowledgements 437 References 437 15. Investigations of Local Thermal Properties by SThM Microscopy 439 15.1. Scanning Thermal Microscopy: Principle, Equipment, Operation Modes 440 15.2. Thermal Imaging: Temperature and Conductivity Contrast Measurements 445 15.3. Quantitative Thermal Measurements with SThM Equipment - Potentialities and Limitations 448 15.4. Methods for Improvements of Sensitivity and Stability of Thermal Measurements Using Batch Fabricated Thermal Probes 453 15.5. Determination of the Thermal Conductivity of Submicron Layers on Thick Substrates 458 15.6. Application of Qualitative and Quantitative SThM Measurements in Investigation of Perovskites (Thin Films, Bicrystals) 460 Acknowledgements 462 References 463 16. Studying the Local Redox Processes on Transition Metal Oxides Surfaces Using Kelvin Probe Force Microscopy 466 16.1. Introduction 466 16.2. Principles of Kelvin Probe Force Microscopy 468 16.2.1. Basics of KPFM Operation 468 16.2.2. Forces in Atomic Force Microscopy 469 16.2.3. Technical Realization of KPFM 472 16.2.4. Limits of Resolutions in KPFM 474 16.3. Local Surface Potential of Oxide Metal Surfaces upon Reduction and Oxidation Processes 478 16.3.1. Titanium Dioxide TiO2(110) Surface 478 16.3.2. Strontium Titanate SrTiO3(100) Surface 484 16.4. Summary 491 Acknowledgements 492 References

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