Defects and Surface-Induced Effects in Advanced Perovskites

Complex oxide materials, especially the ABO 3 -type perovskite materials, have been attracting growing scientific interest due to their unique electro-optical properties, leading to photorefractive effects that form the basis for such devices as holographic storage, optical data processing and phase conjugation. The optical and mechanical properties of non-metals are strongly affected by the defects and impurities that are unavoidable in any real material. Nanoscopically sized surface effects play an important role, especially in multi-layered ABO 3 structures, which are good candidates for high capacity memory cells.
The 51 papers presented here report the latest developments and new results and will greatly stimulate progress in high-tech technologies using perovskite materials.

Zusammenfassung
Proceedings of the NATO Advanced Research Workshop, Jurmala, Latvia, 23-25 August, 1999

Inhalt
I Modelling of Defects and Surfaces.- Quantum Mechanical Modelling of Pure and Defective KNbO3Perovskites.- First-Principles Simulation of Substitutional Defects in Perovskites.- Point Defects, Dielectric Relaxation and Conductivity in Ferroelectric Perovskites.- Use and Limitations of the Shell Model in Calculations on Perovskites.- What can We Learn about Perfect and Defective MgO(001) Surface Using Density Functional Theory?.- Defect Calculations for Yttrium Aluminum Perovskite and Garnet Crystals.- Theoretical Studies of Impurity Doped and Undoped BaTiO3and SrTiO3Crystals.- II Experimental Study of Structure and Basic Properties; HTSC.- EPR Investigations of Small Electron and Hole Polarons in Oxide Perovskites.- Nb4+Polaron and Ti3+Shallow Donor Jahn-Teller Centers in LiNbO3Systems.- Polarons and Bipolarons in Oxides.- Structural Distortions and Oxygen Local Dynamic Instabilities in Superconducting Perovskites.- Subpicosecond Laser Spectroscopy of Blue-Light-Induced Absorbtion in KNbO3and LiNbO3.- Extended X-Ray Absorption Fine Structure Spectroscopy of Perovskite-Type Compounds.- X-Ray Absorption Spectroscopy of (Pb1-xLax)(Zr0.65Ti0.35)O3at the ZrKand PbL3Edges.- IR Spectroscopy of Monoclinic Tungsten Oxide.- Low Temperature Optical Absorption by Magnons in KNiF3and NiO Single-Crystals.- The Metastable Superior Phases in Bi-2212 Perovskite-Like High-Temperature Superconductor.- Surface-Induced Drift and Selforganization Features of Microwave Losses in High-T. Superconductor Perovskites.- III Effects on Surfaces, Interfaces and Thin Films.- QM Study on Transition Metal Perovskites.- Chemisorption by Simple Oxide Surfaces.- Theoretical Simulations of Surface Relaxation for Perovskite Titanates.- Wetting of Domain Walls in Perovskites.- Ferroelectric Soft-Mode Spectrocopy in Disordered Bulk and Thin-Film Perovskites.- Metals on Metal Oxides: Study of Adsorption Mechanisms with the Metastable Impact Electron Spectroscopy (MIES).- Properties of Multiphase Interfaces on the Tungsten Trioxide Particles in the Thin Films.- The Joining of LiNbO3Quartz, TIBr-TII and Other Optical Materials by the Use of Thin Metal Films as Bonding Agents.- Experimental Study of Texture and Self-Polarization of Sol-Gel Derived PZT Thin Films.- Experimental Study of Heat Properties of Ba1-xSrxTiO3Thin Films on a Substrate.- Synthesis of Lead Zirconate Antiferroelectric Thin Films by Sol-Gel Processing.- IV Defects and Phase Transitions.- Infrared Spectroscopy of OH-induced Defects in Fluoroperovskites.- Hydrogen-Related Effects in Oxides.- Ion-Beam-Induced Defects and Defects Interactions in Perovskite-Structure Titanates.- Phase Transitions in Incipient Ferroelectrics of Perovskite Structure with Impurities.- Influence of Structure Ordering, Defects and External Conditions on Properties of Ferroelectric Perovskites.- Phase Transition Anomalies in Crystals with Defects.- Defects in Perovskites Induced by Illumination.- Defect Luminescence Study in Tetragonal GeO2Crystals.- Thermally Stimulated Ionic and Electronic Processes and Radiation-Induced Defect Annealing in LiBaF3Crystals.- Radiation Defects in LiBaF3Perovskites.- Radiation Induced Defects in Yttrium Aluminium Perovskite.- Laser-Calorimetric Study of Fundamental Absorption Edge in Pb,La(ZrTi)O3(PLZT) Perovskite Ceramics.- Mesoscopic Scale Polarization Inhomogeneities in Electrooptic Ceramics: the Chaotic Phase Screen Model.- New Ideas in Relaxor Theory.- V Advanced Technologies, New Perovskite Materials and Applications.- Nature of the Defects Induced by Photoinjection of Hydrogen in Transition in Metal Oxides.- Assessment of Surface Quality by SHG in Oxide Crystals.- Perovskite Materials for Optical Filtering and the Generation of Coherent Radiation.- Preparation and Properties of La1-xAxMnO3(A = Ca,Sr) Single Crystals.- Oxygen Diffusion in Donor Doped SrTiO3: Influence of Thermal Pretreatment.- Effect of Reducing and Oxidizing Atmospheres on the PTCR Properties of BaTiO3.- New Approach for Boundary Conditions: Space Charge Controlled Concentrations of Cation Vacancies in Donor Doped SiTiO3for Short Diffusion Length.- Defect Luminescence of LiBaF3Perovskites.- Author Index.