Synthesis of CoxMg1–xAl2O4 as cobalt blue ceramic pigments by Pechini process
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Blue pigments
Pechini cobalt blue
Brown pigments
Pechini process

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Tuyền TN, Hải HVM, Hoàng N Đức. Synthesis of CoxMg1–xAl2O4 as cobalt blue ceramic pigments by Pechini process. HueUni-JNS [Internet]. 2019Jul.12 [cited 2020Oct.20];128(1C):5-11. Available from:


In the present paper, the cobalt blue ceramic pigments with formula CoxMg1–xAl2O4 (x = 0,1÷0,9) with the spinel structure of MgAl2O4 were synthesized using the Pechini process. The resulting powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and CIE L*a*b* color measurement. The results show that the pigments calcinated at 1100 °C for 60 minutes provide a single phase of spinel with a high degree of crystallinity. The blue color intensity increases gradually with the amount of substituted Co2+ ions. The resulting pigments meet industrial requirements in terms of physicochemical characteristics.
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