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首页> 外文期刊>Physica status solidi, B. Basic research >Structural, magnetic, and electrical features of the Nd2SrMn2TiO9 perovskite-like compound
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Structural, magnetic, and electrical features of the Nd2SrMn2TiO9 perovskite-like compound

机译：Nd2SrMn2TiO9钙钛矿状化合物的结构，磁性和电学特征

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摘要

The synthesis process of the polycrystalline ceramic compound Nd2SrMn2TiO9 by means of the solid-state reaction procedure is reported. The crystalline structure was analyzed through X-ray diffraction experiments in the Bragg-Brentano recipe. The Rietveld refinement of the diffraction pattern by using the GSAS code shows that this material crystallizes in an orthorhombic structure, space group Pnma (#62), with lattice parameters a = 5.4764(6) angstrom, b = 7.7468(6) angstrom, and 5.4810(6) angstrom. The surface morphology was studied by scanning electron microscopy images, which evidence the formation and compacting of grain with mean size 352.63 nm. Semiquantitative compositional analysis performed by means of Energy Dispersive X-ray Spectroscopy shows the stoichiometric composition of the samples. Measurements of magnetization as a function of temperature reveal that this compound has a ferromagnetic behavior. The analysis with the Curie equation permitted to establish an effective magnetic moment mu(eff) = 4.33 mu(B), which is 95.7% in agreement with the theoretical value expected from the Hund's rules. Measurements of DC resistivity as a function of temperature show a conductor behavior below the Curie temperature and insulator above. Evidences of a nonlinear response as a function of frequency with high values of relative dielectric constant reveal the occurrence of giant dielectric constant with epsilon(r) = 6480 for nu = 100Hz. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
机译：报道了通过固相反应方法合成多晶陶瓷化合物Nd2SrMn2TiO9的过程。通过Bragg-Brentano配方中的X射线衍射实验分析了晶体结构。使用GSAS代码对衍射图进行Rietveld细化显示，该材料以正交结构，空间群Pnma（＃62）结晶，其晶格参数a = 5.4764（6）埃，b = 7.7468（6）埃，并且5.4810（6）埃。通过扫描电子显微镜图像研究了表面形态，这证明了平均尺寸为352.63 nm的晶粒的形成和压实。通过能量色散X射线光谱法进行的半定量组成分析显示了样品的化学计量组成。磁化强度随温度的变化表明该化合物具有铁磁行为。利用居里方程进行的分析允许建立有效磁矩mu（eff）= 4.33 mu（B），为95.7％，与Hund规则所期望的理论值一致。直流电阻率随温度变化的测量结果表明，导体性能低于居里温度，绝缘体高于居里温度。非线性响应随频率变化而具有较高相对介电常数值的证据表明，对于nu = 100Hz，epsilon（r）= 6480时会出现巨大的介电常数。 （C）2016 WILEY-VCH Verlag GmbH＆Co.KGaA，魏因海姆

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