… and a double band with maximal absorption at 617 and 582 nm are assigned to Co 2+ in
a tetrahedral site. In four coordinate tetrahedral and pseudotetrahedral cobalt(II), the 4 A 2 …

… octahedral [Co II O 6 ] to the most stable tetrahedral [Co II O 4 ] … a ceramic glaze containing
a cobalt based ceramic pigment … pigment crystals dispersed in the glaze, but also from cobalt …

… The first one does not affect the pigment formation, the second one can contribute to the
formation of zircon as shown in eq.2and contributes to the oxygen regeneration that, according …

… 2+ entering the octahedron spaces increased, which would result in a decrease in the
number of Co 2+ in the tetrahedron spaces. In this case, the coordination number of …

… as blue ceramic pigments of both Co 2+ –Zn 2 SiO 4 (willemite) and Zn 2+ –Co 2 SiO 4 (olivine…
Therefore, the solid solution of Zn 2+ in the olivine lattice and that of Co 2+ in the willemite …

… Green ceramic pigment can be prepared by adjusting the blue component (CoCr 2 O 4 ) …
amounts of Co 2 O 3 , to balance the color proportion of yellow and blue in pigments according …

… Optical spectra are dominated by the strong absorption bands of Co 2+ in tetrahedral
coordination (crystal field strength Dq=421 cm −1 , Racah B parameter=793 cm −1 ). The best …

… , which corresponded to the ν 3 [ 4 A 2 (F) → 4 T 1 (P)] spin-allowed transitions of Co 2+ in
an tetrahedral ligand field.43 The blue color was due to the absorption of light at this range. As …

… The choice of pyroxene matrix for the production of ceramic pigments is also determined by
… ceramic pigments [5,6]. The best studied and proposed as a ceramic pigment is the cobalt-…

… Indeed, in the case of tetrahedral Co 2+ the two first spin-allowed bands (ν 1 : 4 A 2 (F) → 4
T 2 (F); ν 2 : 4 A 2 (F) → 4 T 1 (F)) fall in the infrared region (around 1400 and 1600 nm), and …