Ceramics-Silikáty 59 (3) 211-215 (2015)

COMPARISION OF THE COLOR PROPERTIES OF COMPOUNDS Ln₂Ce₂O₇ AND Ln₂CeZrO₇

Pyrochlore type pigments Ln₂Ce₂O₇ and Ln₂CeZrO₇ (Ln = Nd, Sm, Gd, Dy, Er, Yb and Y) prepared by solid-state reaction were investigated. Effect of rare earths and zirconium ions and calcination temperature (1400, 1500 and 1600°C for Ln₂Ce₂O₇ and 1400, 1450 and 1500°C for Ln₂CeZrO₇) on their color properties in organic matrix and ceramic glazes, particle size distribution and phase composition were evaluated. The most interesting shades achieve compounds with the highest calcination temperature. Their colors depend on used rare earth ions (shades change from green, cross yellow to pink in organic mass and from green, cross yellow-green to orange in ceramic glazes), while compounds without zirconium have better color properties. Pigments Ln₂Ce₂O₇ calcined at 1600°C are single-phase (except Yb₂Ce₂O₇).

Keywords: Rare earths oxides, Pyrochlore, Inorganic pigment, Zirconium oxide