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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Multiferroic behavior in silicate glass nanocomposite having a core-shell microstructure
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Multiferroic behavior in silicate glass nanocomposite having a core-shell microstructure

机译：具有核-壳微结构的硅酸盐玻璃纳米复合材料中的多铁性行为

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摘要

Nanosized iron core and barium titanate shell microstructure was generated within a silicate glass of composition 23.1 Na2O, 23.1 BaO, 23.0 TiO2, 7.6 B2O3, 5.8 Fe2O3, 17.4 SiO2 by first reducing it at 893 K for 16 h and then subjecting it to heat treatment at 759 K for 4 h. Transmission electron microscopy showed the composite particles to have a mean diameter of 3.9 nm. The nanocomposite exhibited both ferroelectric and ferromagnetic behavior. The dielectric constant peak was not prominent because of a small thickness of the barium titanate phase. The magnetic hysteresis loop showed an asymmetric behavior giving rise to a small exchange bias field. This is believed to arise due to exchange interaction between the ferromagnetic iron core and the thin layer of Fe3O4 on the core surface with a spin glass-like behavior. The magnetization under zero-field cooled (ZFC) and field cooled (FC) conditions indicated superparamagnetic behavior at temperatures higher than 300 K. The optical absorption spectra exhibited a peak at around 325 nm. This was analyzed satisfactorily on the basis of a metal core-oxide shell nanoconfiguration. The extracted values of metal core conductivity showed a metal insulator transition for iron core diameters less than 2.4 nm. The present synthesis approach will lead to newer multiferroic nanocomposites and glasses with multifunctionalities.
机译：在组成为23.1 Na2O，23.1 BaO，23.0 TiO2、7.6 B2O3、5.8 Fe2O3、17.4 SiO2的硅酸盐玻璃中产生纳米尺寸的铁芯和钛酸钡壳微结构，方法是先在893 K下还原16 h，然后对其进行热处理在759 K下持续4小时。透射电子显微镜显示该复合颗粒的平均直径为3.9nm。纳米复合材料表现出铁电和铁磁行为。由于钛酸钡相的厚度小，所以介电常数峰不显着。磁滞回线显示出不对称行为，从而产生较小的交换偏置场。认为这是由于铁磁铁芯与芯表面上的Fe 3 O 4薄层之间的交换相互作用而具有类似自旋玻璃的行为。零场冷却（ZFC）和场冷却（FC）条件下的磁化表明在高于300 K的温度下具有超顺磁性能。光吸收光谱在325 nm处出现一个峰值。在金属核氧化物壳纳米结构的基础上进行了令人满意的分析。金属芯导电率的提取值显示出铁芯直径小于2.4 nm的金属绝缘体转变。当前的合成方法将导致更新的具有多种功能的多铁纳米复合材料和玻璃。

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