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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Deepening the shear structure FeNb11O29: influence of polymorphism and doping on structural, spectroscopic and magnetic properties
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Deepening the shear structure FeNb11O29: influence of polymorphism and doping on structural, spectroscopic and magnetic properties

机译:深化剪切结构FENB11O29:多态性和掺杂对结构,光谱和磁性的影响

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FeNb11O29 is an intriguing and promising material that has been emerging in the last few years. It is isostructural with Nb12O29, one of the rare compounds in which Nb displays a local magnetic moment and shows both antiferromagnetic ordering and metallic conductivity at low temperatures. Both the two polymorphic monoclinic and orthorhombic forms have a mono-dimensional magnetic arrangement, but the different disposition of the structural building blocks leads to a strong frustration phenomenon of the magnetic order in the high-temperature orthorhombic form. Whereas Nb12O29 has been widely studied, barely few magnetic data can be found on its analogous FeNb11O29, for which a role of the Fe3+ localized d electrons in affecting the original magnetic behaviour can be foreseen. In this paper, we report how we synthesized undoped and, for the first time, Mn- and V-doped FeNb11O29. Both the monoclinic and orthorhombic polymorphs, stable in different temperature ranges, were then thoroughly structurally characterized. With the help of micro-Raman spectroscopy, we investigated the differences introduced into the vibrational levels by doping, while EPR data allowed us to obtain information on the transition metal ions and to point out the related peculiar structural features. Static magnetization measurements evidenced the paramagnetic character of the compounds and the high-spin configuration of Fe3+ ions.
机译:FENB11O29是在过去几年中出现的有趣和有希望的材料。它是具有Nb12O29的表人图,其中Nb显示局部磁矩的稀有化合物之一,并在低温下显示反铁磁性排序和金属导电。两种多态性单斜晶型和矫正形式都具有一维磁性布置,但结构构建块的不同布置导致高温正交形式中磁场的强烈挫折现象。虽然NB12O29已被广泛研究,但在其类似的FENB11O29上可以找到几乎没有磁数据,其中FE3 +局部D电子在影响原始磁性行为的作用可以预见。在本文中,我们报告了我们如何合成,并且第一次,MN-和V掺杂FENB11O29。然后在不同温度范围内稳定的单斜晶型和正骨,稳定性地表征。在微拉曼光谱的帮助下,我们通过掺杂调查了引入振动水平的差异,而EPR数据则允许我们获得关于过渡金属离子的信息并指出相关的特殊结构特征。静态磁化测量证明了化合物的顺磁性和Fe3 +离子的高旋转构型。

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