粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
研究論文
CaH2還元によるSiO2被覆Feナノ粒子の合成と磁気特性
松本 章宏杉浦 俊彦小橋 眞山本 真平
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ジャーナル フリー

2019 年 66 巻 9 号 p. 429-433

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Well-defined SiO2-coated Fe nanoparticles with various SiO2 thickness from 1.2 to 27.8 nm have been successfully prepared by controlling the amount of tetraethyl orthosilicate and by the subsequent reduction of SiO2-coated Fe3O4 nanoparticles with CaH2. The saturated magnetization of the SiO2-coated Fe nanoparticles increased with decreasing SiO2 thickness. The saturated magnetization of the SiO2-coated Fe nanoparticles with SiO2 thickness of 2.7 nm or more have slightly decreased by 192 hr and did not change above 192 hr throughout atmospheric exposure, whereas that with SiO2 thickness of 1.2 nm steeply decreased in 24 hr and continued to decrease above 24 hr.

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