Novel Phase Transition in BaPr2Mn2O7
来源期刊：Journal of Rare Earths2006年第S1期
论文作者：Hiromi Nakano Naoki Kamegashira
文章页码：1 - 3
摘 要：<正>The rare earth manganite BaLn2Mn2O7（Ln = rare earth element） has a Sr3Ti2O7-type layered perovskite structure with double-block oxygen octahedra belonging to the Ruddlesden-Popper-type homologous series AO（ABO3）2. In Pr-manganite, a novel phase transition was first observed in situ at 1040 K by a thermal transmission electron microscope. At 1040 K, reflections began to split along the c-direction in the selected area diffraction pattern. This indicates that a new phase appears in the original phase matrix; the c length of the new phase is 1.5% longer than that of the original phase. After about 5 min, the original phase disappears. No change in the crystal symmetry （space group 14/mmm） is observed above 1040 K.
Hiromi Nakano，Naoki Kamegashira
摘 要：<正>The rare earth manganite BaLn2Mn2O7（Ln = rare earth element） has a Sr3Ti2O7-type layered perovskite structure with double-block oxygen octahedra belonging to the Ruddlesden-Popper-type homologous series AO（ABO3）2. In Pr-manganite, a novel phase transition was first observed in situ at 1040 K by a thermal transmission electron microscope. At 1040 K, reflections began to split along the c-direction in the selected area diffraction pattern. This indicates that a new phase appears in the original phase matrix; the c length of the new phase is 1.5% longer than that of the original phase. After about 5 min, the original phase disappears. No change in the crystal symmetry （space group 14/mmm） is observed above 1040 K.
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