Structure and magnetic properties of a novel BasY2Mn5O21+δcompound
A new manganese oxide with formula Ba8Y2Mn5O21+δ (δ≤1) has been prepared by solid state reaction.The crystal structure and magnetic properties of the compound have been investigated by X-ray powder diffraction,selected area electron diffraction and magnetization measurements.The compound Ba8Y2Mn5O21+δ is well indexed by a rhombohedral lattice (Space group:R3m) with hexagonal lattice parameters o =5.7929(6) and c =28.586(4)(A).The atomic positions are determined by detailed structure analysis based on the structural characteristics of barium manganates and refined by Rietveld refinement.It indicates that the compound is a distorted perovskite with the Mn vacancies preferentially locating at the face-shared MnO6 octahedra (hexagonal perovskite unit) and Y at the apex-shared YO6 octahedra (distorted cubic perovskite unit).Thermal magnetization measurements reveal the presence of antiferromagnetic interaction between Mn ions in the compounds.However,the deviation from the Curie-Weiss plot at low temperature indicates the existence of localized magnetic coupling.
Barium manganate Ba8Y2Mn5O21+δ Crystal structure X-ray powder diffraction
Li J.-B Wang C.L Gao Q.Q Li G.N Liu G.Y Luo J Du Z.M Rao G.H Liang J.K
Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sci Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sci School of Materials Science and Engineering,University of Science & Technology Beijing,Beijing 10083 School of Material Science & Technology,Guilin University of Electronic Technology,Guilin,Guangxi 54
国内会议
常州
英文
416-419
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）