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Some Magnetic and Crystallographic Properties of the System LaMn1-xNixO3+λ

机译:LaMn1-xNixO3 +λ系统的一些磁性和晶体学性质

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The system LaMn1-xNixO3+λ has been prepared under varying conditions for the entire range of compositions 0≤x≤1. The saturation magnetization, lattice parameters, and chemical analysis have been measured for each sample. The origin of discrepancies in the literature on the crystal structure of LaMnO3 is shown to be due to different preparation procedures which result in the presence of differing amounts of Mn4+: the lattice symmetry changes from orthorhombic to rhombohedral as the Mn4+ concentration exceeds 21% of the total manganese. The system is ferromagnetic with magnetization only slightly less than the spin‐only value over the compositional range 0.2≤x≤0.5: a ferromagnetic Ni3+Mn3+ interaction is indicated. The system remains orthorhombic throughout the range 0≤x≪0.5; it shows an increasing distortion to an apparently monoclinic symmetry in the range 0.5≪x≤0.8. LaNiO3 is rhombohedral at room temperature. The lattice symmetry is compatible with Ni3+ in a low‐spin state: this is also in accord with the magnetization values. Qualitative concepts used to interpret the system (La,Ca)MnO3 are applied to interpret the magnetic and crystallographic properties of this system as well as the magnetic properties of some rhombohedral perovskite‐type systems rich in Mn3+ ions.
机译:对于组成0≤x≤1的整个范围,已经在不同条件下制备了LaMn1-xNixO3 +λ体系。已为每个样品测量了饱和磁化强度,晶格参数和化学分析。文献中关于LaMnO3晶体结构差异的根源是由于不同的制备程序而导致的,Mn4 +的含量不同:当Mn4 +的浓度超过其21%时,晶格对称性从正交晶变为菱面体。总锰。该系统是铁磁性的,在0.2≤x≤0.5的组成范围内,磁化强度仅略小于自旋值:表明存在铁磁性的Ni3 +Mn3+相互作用。该系统在整个0≤x≪0.5范围内保持正交。在0.5≪x≤0.8范围内,它表现出越来越明显的单斜对称畸变。 LaNiO3在室温下为菱面体。在低自旋状态下,晶格对称性与Ni3 +相容:这也与磁化值一致。用于解释系统(La,Ca)MnO3的定性概念可用于解释该系统的磁性和晶体学性质,以及某些富含Mn3 +离子的菱形钙钛矿型系统的磁性。

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    《Journal of Applied Physics》 |1958年第3期|共3页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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