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http://dx.doi.org/10.4313/JKEM.2017.30.12.812

Effect of Fe2+/Fe3+ Molar Ratio on the Synthesized Magnetic Black Pigment by Hydrothermal Method  

Jung, Myung-Ho (Department of Materials Engineering, Chungbuk National University)
Jang, Gun-Eik (Department of Materials Engineering, Chungbuk National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.30, no.12, 2017 , pp. 812-816 More about this Journal
Abstract
$Fe_3O_4$ was prepared on the $TiO_2-coated$ natural mica substrate. The natural mica has an average particle size of $22{\mu}m$. The substrate was coated on $TiO_2$ thin films using hydrothermal synthesis at pH 1.5-2.5 at $75^{\circ}C$. The Fe precursor solution was prepared by mixing $FeSO_4$ (for $Fe^{2+}$ ion) and $FeCl_3$ (for $Fe^{3+}$ ions) with different molar ratios such as 1/2, 1/1, 2/1, 3/0, and $Fe_3O_4$ only. X-ray diffraction analysis shows that the crystal structure depends on the $FeCl_3-to-FeSO_4$ molar ratio. $Fe_3O_4$ crystal phase could be obtained at higher $FeSO_4$ contents.
Keywords
Hydrothermal process; Pearl pigment; $L^{\ast}a^{\ast}b^{\ast}$ chart; $M{\ddot{o}}sbauer$ analysis;
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