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In situ Transmission Electron Microscopy Observation of Multiple Phase Transition in BaGd2Mn2O7

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In situ transmission electron microscopy observation revealed that BaGd2Mn2O7 undergoes several phase transitions upon heating. The orthorhombic Pnnm phase (I) at room temperature was transformed into a tetragonal P42/mnm (II) at around 420 K via an intermediate phase. On further heating, the other phase (III) nucleated in the phase II matrix at 623 K and grew until covering the whole inspected region by 723 K. Phase III has a 1.5% lattice mismatch along c compared with phase II, and presumably has a monoclinic symmetry. The transition between II and III was of the first order.
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Document Type: Research Article

Affiliations: 1: Electron Microscope Laboratory, Ryukoku University, Otsu 520-2194, Japan 2: Ceramics Research Laboratory, Nagoya Institute of Technology, Tajimi 507-0071, Japan 3: Department of Materials Science, Toyohasi University of Technology, Toyohashi 441-8580, Japan 4: Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, 226-8502, Japan

Publication date: April 1, 2007

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