Structure and colour of diphosphate pigments with square pyramid environment around chromophore ions (Co2+, Ni2+, Cu2+)

Synthesis and coloring performance of Ni-geikielite (Ni,Mg)TiO3 yellow pigments: Effect of temperature, Ni-doping and synthesis method

“…In most cases, however, a much better understanding of the crucial role played by crystal chemical aspects is still needed to modulate or improve the coloring performance of already known or even new ceramic pigments. By an accurate knowledge and control of chromophore metal-oxygen distances [3], local environment distortions [6][7][8], cation order-disorder phenomena [9,10], structural relaxation or covalence effects [11] etc., the band gap energies [12][13][14], metal-ligand charge transfers [8] and crystal field intensities and energies on chromophore ions in a particular coordination environment can be tuned [11,12,15], and this is of paramount importance to optimize the coloring properties or to discover new ceramic pigments [16].…”

Co2P2O7–Ni2P2O7 solid solutions: Structural characterization and color

“…Nickel ceramic pigments with a phosphate structure and solid solutions with a diphosphate and orthophosphate structure might also be useful as precursors of yellow ceramic pigments . Phosphate pigments exhibit a partial chemical and thermal stability and resistivity to dissolution agents, hence allowing their use as efficient coloring agent for coloration of ceramic glazes …”

Developing Intense Blue and Magenta Colors in α‐LiZnBO3: The Role of 3d‐Metal Substitution and Coordination

“…Most new pigments reported recently are based on metal oxides with transition‐metal (TM) ions, in which the color arises due to electronic transitions within the partially occupied d‐states of the TM ion. Green‐colored Y 2 BaCuO 5 oxide, blue‐colored YIn 1− x Mn x O 3 oxides, and oxides of different colors based on Co II ‐, Ni II ‐, and Cu II ‐substituted SrZnP 2 O 7 are some of the pigment‐quality materials reported recently …”