New purple-blue ceramic pigments based on CoZr4(PO4)6

Energy Efficiency in the Microwave-Assisted Solid-State Synthesis of Cobalt Aluminate Pigment

“…The stoichiometric ratio of powders, according to the balance: 6Al(OH) 3 was wet milled for 20 min using alumina balls as milling media, in a 1:1 weight ratio. The resulting slurry was dried at 120 • C and subsequently dry milled in an agate mortar with agate balls as milling media, in a 1:1 weight ratio.…”

“…Past research has generally focused on two main directions: an economization and improvement of existing pigments or the discovery and implementation of new compounds with higher performing characteristics. However, due to limitations in available chemistry, very few novel compounds have been developed in the last few decades [3,4]. In the framework of the optimization of existing pigments, alternative synthetic routes can play an important role in accelerating the manufacturing and in reducing the cost of the process, as already demonstrated by some of the authors [5][6][7][8].…”

“…Industrial grade Co 3 O 4 and Al(OH) 3 powders, supplied by Colorobbia Italia, were used as starting raw materials due to their capability of strongly coupling with microwaves at the typical 2.45 GHz frequency allocated for ISM uses. The stoichiometric ratio of powders, according to the balance: 6Al(OH) 3 was wet milled for 20 min using alumina balls as milling media, in a 1:1 weight ratio.…”

Influence of variables on the synthesis of CoFe2O4 pigment by the complex polymerization method

“…Various chemical methods, such as conventional ceramic method [2,14,15], combustion synthesis, co-precipitation [16], sol-gel method [2,17], polymeric precursor [1,18], microwave synthesis [19], and others, have been used to synthesize inorganic pigments. The complex polymerization method (CPM) based on the Pechini method offers the possibility of preparing complexes of good homogeneity at molecular scale and a good stoichiometric control.…”

“…The color of each pigment is the result of the addition of chromophore ions (usually transition metals) in an inert matrix (oxide or oxide systems) [1,2].…”