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Preparation and Spectroscopy Analysis of Spinel CoCr2― xAl xO4 by Low―temperature Combustion Synthesis

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Author(s): HU Dong-Sheng, HAN Ai-Jun, YE Ming-Quan, CHEN Hou-He, ZHANG Wei

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 3;
Start page: 285;
Date: 2011;
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Keywords: spinel CoCr2- xAl xO4low-temperaturecombustion synthesisspectroscopycolor parameters

ABSTRACT
As a member of complex metal oxides, spinel CoCr2O4 has wide application in ceramic pigment, catalysis and magnetic materials. In order to reduce the Cr content and modify the colorperformance, nanoscaled spinel solid solution CoCr2― xAl xO4 ( x=0,0.05, 0.1, 0.2, 0.3 and 0.5) was synthesized by low―temperature combustion synthesis (LCS) method using citric acid (reductant) and metal nitrates(oxidants) as starting materials. XRD, TEM, FT―IR, UV―Vis spectrometer and colorspectrometer were employed to characterize the structure, morphology, infrared,ultraviolet―visible curve and the color parameters of the as―prepared sample, respectively.Results show that single―phased and uniform CoCr2― xAl xO4with about 15―30 nm in size can be prepared by LCS at 800 ¡æ.Absorption bands at about 520 cm ― 1 , 630 cm ― 1 and 410―450 cm ― 1 in IR curve are corresponding to the vibration ofoctahedron group and the complex vibration of octahedron and tetrahedron group. Absorptionbands at 570, 610 and 660 nm inthe visible region of UV―Vis curve are assigned to the 4A2(F)¡ú4T1(P)of Co2+ and 4A2g¡ú4T2g ofCr3+. Color spectrometer characterization results indicate that the sample exhibits best color performance with x=0.2,showing a bright bluish green color.
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