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Synthesis and color properties of the TiO 2 @CoAl 2 O 4 blue pigments with low cobalt content applied in ceramic glaze
Author(s) -
He Xuanmeng,
Wang Fen,
Liu Hui,
Niu Lijun,
Wang Xinzhen
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15422
Subject(s) - pigment , materials science , glaze , cobalt , coal , absorption (acoustics) , spinel , x ray photoelectron spectroscopy , mineralogy , chemical engineering , analytical chemistry (journal) , nuclear chemistry , ceramic , chemistry , metallurgy , composite material , chromatography , organic chemistry , engineering
The TiO 2 @CoAl 2 O 4 complex blue pigments with low cobalt content were synthesized through calcinations of the precursor obtained from coprecipitating Co 2+ and Al 3+ to form Co‐Al LDH s (layered double hydroxides) on the surface of TiO 2 particles. The structure and the properties of the synthesized pigments were characterized by XRD , SEM , TEM , UV ‐Vis spectroscopy, XPS , and colorimeter. The precursors of the blue TiO 2 @CoAl 2 O 4 complex pigments were consisted of LDH s shell layer encapsulated TiO 2 microsphere. After calcinations at 1100°C, the LDH s shell layer were absolutely transformed to the spinel CoAl 2 O 4 , and the pigments presented a core‐shell structure and uniform sphere morphology (the diameter of microsphere was about 780 nm). The absorption bands at around 547, 584, and 624 nm in the Uv‐Vis absorption spectra of the TiO 2 @CoAl 2 O 4 complex pigments were corresponded to the characteristic absorption bands of the spinel CoAl 2 O 4 , revealed the pigments with a bright blue hue. In addition, as the mass ratio of CoAl 2 O 4 /TiO 2 increased to 0.4, the blue component of the pigments reached to 27.89 and slight color variation with the increase in the CoAl 2 O 4 content in a range, possessed low cobalt content and exhibited a stabile performance in commercial low‐temperature ceramic glazes. The XGT results showed that the TiO 2 @CoAl 2 O 4 complex pigments with low cobalt content presented bright color in ceramic glaze. Especially, the synthesized pigments reduced the usage and toxicity of cobalt, which were efficiency for economy and environmental protection.