The discovery of novel blue ceramic pigments has attracted significant interest, since currently, some of the most used commercial pigments contain cobalt, e.g. cobalt aluminate spinel (CoAl2O4) and cobalt (II) stannate (Co2SnO4) . Due to the toxicity, limited resources of cobalt raw materials and their increasing use in energy materials, new cheap, durable, and low toxicity blue pigments that avoid the use of cobalt are needed .