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New 10H perovskites Ba5Ln1?xMn4+yO15?δ with spin glass behaviour

机译:新型10H钙钛矿Ba 5 Ln 1? x Mn 4+ y O < sub> 15?δ 具有自旋玻璃行为

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New 10H perovskite phases of composition Ba5Ln1?xMn4+yO15?δ (Ln = Sm–Lu) have been synthesised by solid-state reactions at 1300 °C. Their crystal structures have been investigated using X-ray and neutron diffraction. The 10H perovskite structure has an ordered arrangement of Ln and Mn ions on the corner-sharing octahedral centres and the face-sharing octahedral centres respectively. MnO6 octahedral distortions and short Mn–Mn distances have been identified in these structures, and oxygen vacancies are found in the c-BaO3 layers. Additionally, magnetic measurements and neutron diffraction identify spin glass transitions in these new materials. These transitions are related to the Mn ions on the corner sharing octahedral sites, which mediate magnetic interactions between tetramers of MnO6 octahedra.
机译:Ba 5 Ln 1? x Mn 4+ y O 15?δ (Ln = Sm-Lu)是通过1300°C的固相反应合成的。使用X射线和中子衍射研究了它们的晶体结构。 10H钙钛矿结构分别在角共享八面体中心和面共享八面体中心有序排列的Ln和Mn离子。在这些结构中已发现MnO 6 八面体形变和短的Mn-Mn距离,并且在c-BaO 3 中发现了氧空位sub> 层。此外,磁性测量和中子衍射可确定这些新材料中的自旋玻璃化转变。这些转变与角共享八面体位点上的Mn离子有关,这些离子介导了MnO 6 八面体的四聚体之间的磁性相互作用。

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