| Abstract [eng] |
The aim of this doctoral thesis was to investigate the analogous pigments to historical green pigments and to develop novel cobalt chromite based pigments and compare their abilities to colour corresponding ceramic glazes. The investigation of nine historical pigments showed that only three of them possessed the same chemical structure as it was given in the manufacturer’s catalogue. The main scientific novelty of this doctoral dissertation is the development of pigments and corresponding ceramic glazes having different shade of bluish-green colours by variation of transition or lanthanide metal and its concentration. The second scientific novelty is the case of CoGa2O4 employment as a ceramic pigment for the first time to our knowledge. The substitution of Co2+ ion by Ni2+, Cu2+, and Zn2+ ions gave the variety in colours: from bluish-green to warm green (Ni-doped), yellowish green (Zn-doped) and nearly black (Cu-doped) hues. Cobalt chromite samples with substitution of Cr3+ by Tm3+ and Yb3+ ions varied in colours depending on the dominant phase: from bluish-green colour to dark brown. Pb-free ceramic glazes displayed colours corresponding to the colours of the pigments for both types of syntheses. The colours of obtained CoCr2–xGaxO4 pigments and their corresponding ceramic glazes differred: the substitution of Cr3+ by Ga3+ ion led to the gradual light blueness of the pigment, whereas ceramic glaze prepared using CoGa2O4 pigment turned out to possess violetish blue colour. |
