Self-Assembled and Modulated Domain Epitaxial Oxide Heterostructures

本理论与实验相结合的研究项目旨在对外延系统中应变控制结构调制（协同有序）进行严格的理论认识和实验验证。将研究金属氧化物（如钙钛矿）在相干约束条件下固态转变的基本方面，包括理解转变的机制和动力学参数，以及在异质结构和超晶格层内设计和实现横向调制畴和异相微观结构的新途径。在超晶格层中横向调制与三维超晶格的可能性之间的关系将被探讨。在固-固相变中调制结构演化的热力学和动力学将特别研究铁电、铁弹性和铁磁相变。该项目是多学科的，结合了基础材料理论和实验合成和加工研究，采用先进的表征工具和分析方法，以解决技术相关和高潜在回报的主题领域的前沿问题。该研究将为先进电子器件和集成电路的几个方面提供基础的材料科学知识。从本研究项目中获得的知识和理解有望通过为设计和生产改进的材料和材料组合提供基本的理解和基础，从而为改进先进器件和电路的性能做出贡献。该计划的一个重要特点是通过培养学生在一个基础和技术上重要的领域的研究和教育的整合。* * *

9633638 Roytburd This combined theory and experiment research project aims for a rigorous theoretical understanding and experimental verification of strain controlled structural modulation(cooperative ordering) in epitaxial systems. Fundamental aspects of solid state transformation under coherently constrained conditions in metal oxides such as perovskites will be studied with respect to understanding the mechanisms and kinetic parameters of the transformations, and with respect to developing new routes to the design and realization of transversely modulated domain and heterophase microstructures inside heterostructure and superlattice layers. The correlation of transversal modulations in layers of superlattices and possibility of 3-dimensional superlattices will be explored. The thermodynamics and kinetics of the evolution of modulated structures in solid-solid phase transformations will be studied specifically in ferroelectric, ferroelastic, and ferromagnetic transformations. %%% The project is multidisciplinary combining fundamental materials theory and experimental synthesis and processing studies with advanced characterization tools and analysis methods to address forefront issues in a topical area of technological relevance and high potential payoff. The research will contribute basic materials science knowledge at a fundamental level to several aspects of advanced electronic devices and integrated circuitry. The knowledge and understanding gained from this research project is expected to contribute in a general way to improving the performance of advanced devices and circuits by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. ***