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首页> 美国政府科技报告 >Synthesis of Ceramics from Solutions: Functionally Graded Composites,NanoComposites and Single Crystal Thin Films. Epitaxial Growth and Structure of Highly Mismatched Oxide Films with Rock-Salt Structure on MgO
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Synthesis of Ceramics from Solutions: Functionally Graded Composites,NanoComposites and Single Crystal Thin Films. Epitaxial Growth and Structure of Highly Mismatched Oxide Films with Rock-Salt Structure on MgO

机译：从溶液中合成陶瓷：功能梯度复合材料，纳米复合材料和单晶薄膜。 mgO上岩盐结构高度错配氧化膜的外延生长和结构

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CaO thin films were grown on (001) MgO single crystal substrates by a chemicalsolution deposition method to study the influence of a relatively high lattice mismatch (14%) on the epitaxial growth. In order to minimize an influence of a different crystal structure and chemistry between film and substrate, film and substrate were chosen to have the same structure (NaCl) and a similar chemistry. The films were heat treated until they broke up into single crystal islands on the MgO substrate. X-ray pole figure analysis and TEM observations of the CaO-films showed that most of the grains had a single out-of-plane orientation (111)CaO (parallel lines) (001)MgO, corresponding to two non-redundant, symmetry related in-plane variants 110(111)CaO (parallel lines) 110(001)MgO and 110(111)CaO (parallel lines) 110(001)MgO. A sigma 7/ sigma 8 Near Coincidence Site Lattice (NCSL) model could be constructed for the interface, that suggests good lattice and charge matching for the observed orientation relations. The mechanisms and energetics leading to the experimentally observed orientation relations are discussed.

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