Synthesis and Characterization of ceramic pigments based on Co- MgTi2O5 pseudobrookites and effect of Zn co-doping
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Synthesis and Characterization of ceramic pigments based on Co- MgTi2O5 pseudobrookites and effect of Zn co-dopingAutoría
Tutor/Supervisor
Llusar Vicent, MarioTutor/Supervisor; Universidad.Departamento
Universitat Jaume I. Departament de Química Inorgànica i OrgànicaFecha de publicación
2015-07-31Editor
Universitat Jaume IResumen
Different titanate-based structures are being investigated in the last years as a new or
emergent family of ceramic pigments. For this reason, this investigation is based on Co-
MgTi2O5 pseudobrookites. The first ... [+]
Different titanate-based structures are being investigated in the last years as a new or
emergent family of ceramic pigments. For this reason, this investigation is based on Co-
MgTi2O5 pseudobrookites. The first objective is the synthesis and characterization of these
pigments and the second objective is analyzing the effect of zinc co-doping, observing its
influence on their stability against decomposition, the possible modification of their optical
properties and also their pigmenting performance within ceramic glazes.
Solid solutions of Mg1-xCoxTi2O5 (x=0.05, 0.1, 0.2, 0.4) and Mg1-x-y Cox ZnyTi2O5 (x=0.05,
0.1, 0.2 and y=0.2) pseudobrookite (karrooite) were prepared by traditional ceramic route
using fast firing conditions (1200 ºC/3h). Fired powders were characterized by X-ray diffraction
(XRD), enameling of the samples with different glazes, ultraviolet visible spectroscopy (UV-Vis)
and colorimetry CIE-L*a*b*.
XRD results confirmed the effective formation of solid solutions of (Co,Zn,Mg)Ti2O5 and
the presence of seconday phase ilmenite. More intense and darker green colorations were
obtained with increasing Co-doped. This colour is associated with electronic transitions of Co+2
in octahedral environments.
The colouring potential of the pigments was tested by applying them in different
industrial double-firing transparent glazes. Green colour was obtained using a high
temperature glaze (1050 °C, CaO- and ZnO-enriched glazes) being less stable pigments in low
temperature glazes which had blue colour. This colour is associated with Co+2 in tetrahedral
environments.
Selected compositions were also prepared using an unconventional method,
metalorganic decomposition route (MOD), and rapid firing conditions (1000-1200 °C). The
objective was to analyze the advantages in reactivity, chemical stability and colorimetric
properties. XRD confirms an improvement of reactivity but colour only presents a slightly
change. [-]
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Treball de Final de Grau en Química. Codi: QU0943. Curs acadèmic 2014-2015
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- Grau en Química [265]