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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural studies on iron-tellurite glasses prepared by sol-gel method
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Structural studies on iron-tellurite glasses prepared by sol-gel method

机译：溶胶-凝胶法制备铁锂玻璃的结构研究

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摘要

In this study, we report structural properties of the iron-tellurite glasses obtained using the sol-gel synthesis. The samples were characterized by X-ray diffraction, FTIR, UV-vis and EPR spectroscopy. Our results indicate dominant presence of iron ions in the trivalent state and the existence some Fe~(2+) ions. The analysis of the IR spectra indicates a gradual transformation of iron ions from tetrahedral into octahedral sites when the concentration of Fe(NO_3)_3 is increased beyond 0.64 mol%. EPR studies show that the increase of Fe(NO_3)_3 content in the host matrix induces the growth of the number of effective g values. This can be explained considering that the orbitals of O~(2-) ion with a large spin-orbit interaction constant will interact with the 3d orbital of Fe~(3+) ion bonded to this O~(2-) ion, thus leading to appearance of an orbital angular momentum which contributes to the magnetic moment of Fe~(3+) ion. A strong dipolar interaction, which is more predominant in a glass with higher content of Fe(NO_3)_3, causing a localized magnetic field along the site of the Fe~(3+) ions and the increase the effective g values.
机译：在这项研究中，我们报告了使用溶胶-凝胶合成法获得的铁锂玻璃的结构特性。通过X射线衍射，FTIR，UV-vis和EPR光谱对样品进行表征。我们的结果表明三价态的铁离子占主导地位，并且存在一些Fe〜（2+）离子。红外光谱分析表明，当Fe（NO_3）_3的浓度增加到超过0.64 mol％时，铁离子将从四面体逐渐转变为八面体。 EPR研究表明，宿主基质中Fe（NO_3）_3含量的增加导致有效g值数量的增加。考虑到自旋轨道相互作用常数大的O〜（2-）离子的轨道将与结合到该O〜（2-）离子的Fe〜（3+）离子的3d轨道相互作用，因此可以解释。导致出现轨道角动量，该角动量有助于Fe〜（3+）离子的磁矩。 Fe（NO_3）_3含量较高的玻璃中更强的偶极相互作用，导致沿Fe〜（3+）离子的位置产生局部磁场，并增加了有效g值。

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