Stability and coloring properties of Ni-qandilite green spinels (Ni,Mg)2TiO4: The “half color wheel” of Ni-doped magnesium titanates
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Otros documentos de la autoría: Llusar, Mario; García, E.; García, M.T.; Gargori, Carina; Badenes March, José Antonio; Monrós, Guillermo
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Título
Stability and coloring properties of Ni-qandilite green spinels (Ni,Mg)2TiO4: The “half color wheel” of Ni-doped magnesium titanatesAutoría
Fecha de publicación
2015-11Editor
ElsevierISSN
0143-7208Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S014372081500282XPalabras clave / Materias
Resumen
Solid solutions of Ni-doped qandilite spinel (Mg2−xNixTiO4, x = 0–0.4) prepared by solid-state and citrate-gel routes were investigated as potential ceramic pigments or dyes. Fired powders were characterized by ... [+]
Solid solutions of Ni-doped qandilite spinel (Mg2−xNixTiO4, x = 0–0.4) prepared by solid-state and citrate-gel routes were investigated as potential ceramic pigments or dyes. Fired powders were characterized by conventional solid-state and color-measurement techniques. The increase of Ni-doping favored qandilite decomposition in Ni-geikielite (Ni,Mg)TiO3 and Ni-periclase (Ni,Mg)O. In the ceramic route, Ni-doped qandilite was stabilized at 1400 °C, but still accompanied by small amounts of MgTiO3 and MgO. Remarkably, the citrate-gel route enabled the formation of single-phase qandilite already at 1200 °C (up to 10%mol Ni), and at 1400 °C for all amounts of Ni-doping. Ni-doped qandilite developed green colors due to Ni2+ ions allocated exclusively in octahedral sites of qandilite spinel, being the green colors of higher chroma in citrate-gel powders. Ni-qandilite powders were chemically instable in low-temperature (950–1050 °C) ceramic glazes, acting only as yellow ceramic dyes. Optical properties of Ni-doped karrooite, geikielite and qandilite pigments were compared. [-]
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Dyes and Pigments, 2015, vol. 122Derechos de acceso
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