Structure and magnetic properties of Ba5Ce1.25Mn3.75O15, a new 10H-polytype in the Ba–Ce–Mn–O system
作者： Mario A. Macías , Olivier Mentré , Silviu Colis , Gabriel J. Cuello , Gilles H. Gauthier
DOI: 10.1016/J.JSSC.2012.10.004
关键词: Neutron diffraction 、 Antiferromagnetism 、 Space group 、 Crystallography 、 Octahedron 、 Materials science 、 Manganite 、 Stacking 、 Atomic force microscopy 、 Valence (chemistry)
摘要: Based on the peculiar magnetic properties that are observed in pseudo one-dimensional manganites, we decided to synthesize new Ba{sub 5}Ce{sub 1.25}Mn{sub 3.75}O{sub 15} compound. The preparation was performed by solid state reaction air at about 1350 Degree-Sign C, for which found compound crystallizes a hexagonal symmetry with space group P6{sub 3}/mmc (No-194) and cell parameters a=b=5.7861(2) A c=23.902(1) A. structural description correlated neutron diffraction bond valence calculations, confirming presence of Ce{sup 4+} Mn{sup segregated different crystallographic positions. displays evidence strong AFM couplings already set room temperature. main arrangement magnetically isolated tetramers face-sharing octahedra is responsible metamagnetic-like transition around 50 K. - Graphical abstract: polytype shows [Ce{sub 0.25}Mn{sub 15}] octahedral, resulting Highlights: Black-Right-Pointing-Pointer 15}, 10H polytype, has been prepared Ba-Ce-Mn-O system. (cchhh){sub 2} stacking sequence. [Ce{submore » separated [CeO{sub 6}] structure. Instead robust ordering, K.« less
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