Environmental-friendly yellow pigment based on Tb and M (M=Ca or Ba) co-doped Y2O3

Abstract

A yellow inorganic ceramic pigment with general formula Y 1.86−x M x Tb 0.14 O 3−x/2 (M = Ca and/or Zn) with x = 0.06, 0.32 and 0.64 were synthesized by a modified Pechini method. XRD, SEM and HRTEM/EDX analysis showed the formation of solid solution at 1300 • C when x = 0.06 and 0.32. The best b* yellow coordinates were obtained for Ca and Zn co-doped Y 1.86 Tb 0.14 O 3 samples. The intensity of the yellow colour in the samples is related to the presence of Tb 4+ ions. Samples with higher concentration of Tb 4+ ions lead to a better yellow colour. The chemical stability of these pigments was determinate in an industrial glaze. The glazing tests indicated that the powder samples with x = 0.06 and 0.32 fired at 1300 • C were stable in the glaze. These results make it a potential candidate for environmental friendly yellow ceramic pigment to be used in applications such as pigment for glazes or inkjet printers.

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

“…Stablishing a comparison with some other yellow ceramic pigments, the colors of these Ni-geikielite pigments (L*/a*/b* parameters between 69-84/5-14/45-56) attain a yellow hue (b*) still less intense than Pr-ZrSiO 4 industrial pigments (for instance L*/a*/b* around 84/1/63 or 83/8/72) [4,57]; however, the yellow colors are similar or slightly better to those obtained with Ni-Sb-doped rutile (L*/a*/b* around 79/-3/50) [58], or with alternative yellow pigments recently published based on zirconium titanate-stannates (Zr (Ti To this respect, the increase of the orange cast (higher red hue) experienced in fired pigments from 1200 to 1400 • C could arise somehow from crystal chemical changes caused by local environment distortions (TiO 6 and (Mg,Ni)O 6 polyedra distortions) or even by partial cation disordering, both affecting the Ni-O distances and therefore the crystalline field exerted on Ni 2+ ions. This possibility is further discussed in Section 3.2.3 (cell parameters measurement), and a close examination of optical absorption spectra of fired pigments (Section 3.4) helped us bring some light into these issues.…”

“…of the still limited pallet of commercially available ceramic pigments [1,2]. Within the last decades, many investigations are being conducted to improve synthesis methods and to develop high-performance ceramic pigments [3,4], enabling their use in high-temperature glazes (above 1200 • C) and also the preparation of coloring ceramic inks for inkjet printing technologies [1,5]. 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.…”

Synthesis, stability and coloring properties of yellow–orange pigments based on Ni-doped karrooite (Ni,Mg)Ti2O5

“…The classical yellows of cadmium sulfide and lead antimoniate pyrochlore Pb 2 Sb 2 O 7 (Naples yellow) 33 are no longer used for toxicity concerns, and the most effective yellow ceramic pigments currently employed are praseodymium-doped zircon (Zr,Pr)SiO 4 , 34 vanadium-doped zirconia V-ZrO 2 35,36 or cassiterite V-SnO 2 , 37,38 and also nickel-antimony-doped rutile (Ni,Sb,Ti)O 2 . 39,40 More recently, zirconium-titanium (tin) srilankites Zr(Ti,Sn)O 4 doped with V (with Al, In or Y as co-dopants) 14 and also Tb and M (M = Ca, Zn or Ba) co-doped Y 2 O 3 41 have been reported as high performance or environmentally-friendly yellow ceramic pigments. Many other compounds have been also claimed as alternative yellow pigments, although the application of most of them were not tested or were only checked for low temperature applications (paints, plastics, inks.…”

SYNTHESIS OF ENVIRONMENTALLY FRIENDLY (Bi, Ca, Zn)VO4 INORGANIC YELLOW PIGMENTS

“…However, the toxicity of these metals could cause a high contamination for soil and water, and affect to human and animal health, certainly. Therefore, the synthesis and using of environment-friendly pigments without toxic metals such as Pb, Cr, Cd, Se have interested many scientists and even normal people [2,3,4,5,6].…”