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Nano-Domain Twin Structure Formed by Phase Transition in New Perovskite Oxide (Sr0.67Sm0.33)(Mn0.33Ti0.67)O3

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A new perovskite oxide, (Sr0.67Sm0.33)(Mn0.33Ti0.67)O3, was synthesized at 1573 K in an Ar flow. The structure of the oxide was determined to be orthorhombic with the space group of Pnma using X-ray diffraction and electron diffraction. High-resolution transmission electron microscope (HRTEM) images of the oxide revealed that nano-domain structures were formed by twinning due to a phase transition. This is the first time that phase transition of the oxide has been observed in situ using a heating stage in a TEM. The high-temperature phase possessed an orthorhombic structure with the space group of Imma, which appeared above 723 K.
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Document Type: Research Article

Affiliations: 1: Electron Microscope Laboratory, Ryukoku University, Otsu 520-2194, Japan 2: Department of Chemistry and Biochemistry, Numazu College of Technology, Numazu 410-8501, Japan 3: Toyohashi Campus Innovation, Toyohashi University of Technology, Toyohashi 441-8580, Japan

Publication date: April 1, 2007

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