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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta)
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Synthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta)

机译：氧氮化物钙酸盐SRMN0.2M0.8O2.6N0.4（M = NB，TA）的合成，晶体结构和磁性。

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摘要

Complex perovskites SrMn0.2M0.8O2.6N0.4 and SrMn0.2M0.8O2.6N0.4 were synthesized; these are rare examples of octahedral Mn2+ in oxynitride perovskites. Joint Rietveld refinement of neutron and X-ray data revealed that SrMn0.2M0.8O2.6N0.4 and SrMn0.2M0.8O2.6N0.4 had orthorhombic symmetries, in contrast with those of analogous perovskites SrM'0.2M0.8O3-xNx (M' = Li, Na, Mg; M = Nb, Ta), which are all tetragonal. Both SrMn0.2M0.8O2.6N0.4 and SrMn0.2M0.8O2.6N0.4 exhibited paramagnetic behavior with effective magnetic moments of 5.60/mu(B) and 5.94 mu(B), respectively, consistent with a high-spin Mn2+ (d(5), S = 5/2) state. The Weiss constants were -24.7 K for SrMn0.2M0.8O2.6N0.4 and -15.4 K for SrMn0.2M0.8O2.6N0.4 indicating the presence of weak antiferromagnetic spin-spin interactions. The band gaps of SrMn0.2M0.8O2.6N0.4 and SrMn0.2M0.8O2.6N0.4 were determined to be 1.75 eV and 2.2 eV, respectively, suggesting that the Mn 3d electrons were essentially localized.
机译：Complex Perovskites SRMN0.2M0.8O2.6N0.4和SRMN0.2M0.8O2.6N0.4被合成; 这些是氧氮化物钙酸盐中八面体Mn2 +的罕见实例。 中子和X射线数据的联合RIETVELD细化显示，SRMN0.2M0.8O2.6N0.4和SRMN0.2M0.8O2.6N0.4具有正交的对称性，与类似的PEROVSKITES SRM'0.2M0.8O3-XNX相比 （m'= li，na，mg; m = nb，ta），这是全四方的。 SRMN0.2M0.8O2.6N0.4和SRMN0.2M0.8O2.6N0.4都表现出具有5.60 / mm（b）和5.94μ（b）的有效磁性矩的顺磁性行为，与高旋转MN2 +一致 （d（5），s = 5/2）状态。 SRM0.2M0.8O2.6N0.4和-15.4 k的Weiss常数为-24.7 k用于SRMN0.2M0.8O2.6N0.4，表明存在弱反霉菌旋转旋转相互作用。 SRMN0.2M0.8O2.6N0.4和SRMN0.2M0.8O2.6n0.4的带间隙分别确定为1.75eV和2.2eV，表明MN 3D电子基本上是局部的。

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