Article ID Journal Published Year Pages File Type
1473598 Journal of the European Ceramic Society 2015 14 Pages PDF
Abstract

Solid solutions of Ni in MgTiO3 ilmenite (geikielite) were investigated as potential yellowish ceramic pigments or dyes. Ni-geikielite samples (Mg1−xNixTiO3, x = 0–0.4) were prepared by solid-state and citrate-gel routes and fired pigments were characterized by XRD, SEM/EDX, UV–vis–NIR and color measurement techniques. The increase of Ni-doping enhanced ilmenite stabilization in ceramic samples, obtaining almost single phase of Ni-geikielite for x = 0.4 at 1200 and 1400 °C. Fired pigments exhibited intense yellow colors at both temperatures, associated to Ni2+ ions in distorted octahedral A sites of ATiO3 ilmenite, and an increase of the orange hue with firing temperature arising from an enhanced (Mg,Ni)O6 polyhedral distortion. Noteworthy, citrate-gel samples exhibited a much higher reactivity, yielding well-crystallized Ni-geikielite at lower temperatures (800 °C/3 h), and leading to higher chroma yellow-orange colors even at lower Ni loadings. These pigments were partially stable in commercial low-temperature ceramic glazes, giving rise to weaker yellowish colors irrespective of the preparation route.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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