Synthesis and characterization of yellow-red pigments of Mg2TiO4, ZnMgTiO4 and Zn2TiO4 spinels doped with Fe3+
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Title
Synthesis and characterization of yellow-red pigments of Mg2TiO4, ZnMgTiO4 and Zn2TiO4 spinels doped with Fe3+Author (s)
Tutor/Supervisor; University.Department
Llusar Vicent, Mario; Universitat Jaume I. Departament de Química Inorgànica i OrgànicaDate
2018-07Publisher
Universitat Jaume IAbstract
The synthesis of inverse spinels of Mg (Mg2TiO4), Mg-Zn ((Mg0.5Zn0.5)2TiO4) and
Zn (Zn2TiO4), doped with different amounts of Fe3+ replacing Mg/Zn2+ and Ti4+ (M2-xFe2xTi1-
xO4, with M= Mg and/or Zn and x = 0, 0.1, ... [+]
The synthesis of inverse spinels of Mg (Mg2TiO4), Mg-Zn ((Mg0.5Zn0.5)2TiO4) and
Zn (Zn2TiO4), doped with different amounts of Fe3+ replacing Mg/Zn2+ and Ti4+ (M2-xFe2xTi1-
xO4, with M= Mg and/or Zn and x = 0, 0.1, 0.25, 0.5, 0.75 and 1), has been performed by the
metalorganic decomposition of citrate gels (MOD-citrates route).
It is analyzed the effect of Fe3+ doping , synthesis temperature (1000°C and 1200°C) and
replacement of Mg2+ by Zn2+ on the formation and optical properties of the spinels. The coloring
performance of the fired pigments once glazed within two conventional ceramic glazes has been
also investigated.
For the characterization of synthesized samples, the techniques of X-ray diffraction
(XRD) and UV-Vis-NIR spectroscopy (interval 300-2500nm) have been used, including cell
parameters, colorimetry (CIE-L*a*b*) and total solar reflectance (TSR) measurements.
In this study it has been seen how the doping with Fe3+ and Zn2+ increases the reactivity
of the spinels, being even stable as ceramic pigments and maintaining the characteristics of the
powders in one of the glazes. Also, doping with Fe3+ produces a color modulation from yellow
to reddish brown, and doping with Zn2+ produces lighter colors compared with the spinels
without Zn.
Keywords: Mg spinel; Mg-Zn spinel; Zn spinel; fired pigments; ceramic glazes, XRD,
Charge Transfer (CT) transitions, spin forbidden (SF) transitions. [-]
Description
Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2017/2018
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