Low temperature combustion synthesis of CoxMg1−xAl2O4 nano pigments using oxalyldihydrazide as a fuel

▶ CoxMg1−xAl2O4 nano-ceramic powders (0.00 ≤ x ≤ 0.10) as blue ceramic pigments were prepared successfully by the low temperature combustion synthesis (LCS) method. ▶ The characterization of nano refractory pigments was studied using different tools such as, FTIR, UV-visible, diffuse reflectance spectroscopy (DRS), different techniques of thermal analysis (TG-DTG/DTA), X-ray diffraction (XRD) and transmission electron microscopy (TEM). ▶ The calcination temperature in the range of 500-1200 °C gives nano pigments with particle sizes in the range of 3.1-37.69 nm using oxalyldihydrazide as fuel. ▶ The particle sizes increased as sintering of samples at different calcination temperatures. ▶ The results show that the blue color intensity depends directly on the amount of cobalt(II) ion, calcination temperature and time.