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I. MIRON1,2, I. GROZESCU1,2,*
Zn1-xCoxAl2O4 (x = 0.05 and 0.1) pigment was synthesized by hydrothermal method and then annealed at 1000ºC. The samples prepared by hydrothermal method exhibit a green colour specific for octahedrally coordinated Co3+ ions. After annealing at 1000ºC, samples changed the colour from green to blue which is the specific colour for tetrahedrally coordinated Co2+ ions. The X-ray diffraction analysis showed a single spinel phase and no trace of impurities. The average crystallite size was found to be around 40 nm (x = 0.05) and 38 nm (x = 0.1). Atomic force microscopy measurements confirmed the nanosize of the particle. Absorbance spectra showed three peaks centered at 620, 593 and 547 nm attributed to the 4A2(F)→4T1(P) transition..
Cobalt, Gahnite, Pigment, Hydrothermal method.
I. MIRON, I. GROZESCU, Cobalt-doped gahnite synthesized by hydrothermal method, Optoelectronics and Advanced Materials - Rapid Communications, 6, 9-10, September-October 2012, pp.931-934 (2012).
Submitted at: Aug. 1, 2012
Accepted at: Sept. 20, 2012
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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