New environmentally friendly pigments based on Ln2Zr2-XFexO7-x/2
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Título
New environmentally friendly pigments based on Ln2Zr2-XFexO7-x/2Autoría
Tutor/Supervisor; Universidad.Departamento
Beltrán Mir, Héctor; Sancho Llopis, Juan Vicente; Universitat Jaume I. Departament de Química Inorgànica i Orgànica; Universitat Jaume I. Departament de Química Física i AnalíticaFecha de publicación
2020-07-10Editor
Universitat Jaume IResumen
In this study, the application of materials with A2B2O7 stoichiometry is addressed. Two
compositions with different lanthanides ion in A position, Gd2Zr2O7 and Ce2Zr2O7, and
doped with the same cation (Fe(III)) in ... [+]
In this study, the application of materials with A2B2O7 stoichiometry is addressed. Two
compositions with different lanthanides ion in A position, Gd2Zr2O7 and Ce2Zr2O7, and
doped with the same cation (Fe(III)) in B position, have been chosen for this work. The
influence of the lanthanide and the iron ions on the structural and optical properties, in
particular the colour of this material has been analysed. In the same way, two synthesis
methods, coprecipitation and hydrothermal, were compared to analyse which one had a
greater effect on phase stabilization and the final coloration. Both the trivalent cation at
A position and the synthesis route, played a key role in the final product characteristics.
The structure of the solids was analysed by X-ray diffraction (XRD) and UV-Vis
spectroscopy was used to study the optical properties of these pigments. The pigments
with composition based on Gd2Zr2-xFexO7-x/2 presented single phase of defect fluorite, in
contrast, powders with formula Ce2Zr2-xFexO7-x/2 could not be synthesized with single phase.
Besides, powders obtained by solvothermal method presented single phase and the limit
of solid solution was x=0,25, for the Gd2Zr2-xFexO7-x/2 compositions. Finally, the colouring
of the pigments, according to CIE L*a*b chromatic coordinates, was better in the case of
solvothermal synthesis for Gd2Zr2-xFexO7-x/2 samples, as the reddish coordinate presented
a slightly higher value. [-]
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Descripción
Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2019/2020
Tipo de documento
info:eu-repo/semantics/bachelorThesisDerechos de acceso
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- Grau en Química [265]