Effect of Zn co-doping on ceramic pigments based on Cr-MgTi2O5 and V-MgTi MgTi2O5 pseudobrookites
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Effect of Zn co-doping on ceramic pigments based on Cr-MgTi2O5 and V-MgTi MgTi2O5 pseudobrookitesAutoría
Tutor/Supervisor
Llusar Vicent, MarioTutor/Supervisor; Universidad.Departamento
Universitat Jaume I. Departament de Química Inorgànica i OrgànicaFecha de publicación
2016-07-31Editor
Universitat Jaume IResumen
The Mg-Ti pseudobrookite or karroita (MgTi2O5) is being studied as host structure
for the development of ceramic pigment forming solid solution with different
chromophores ions (Co2+, Cr4+, Fe3+, Mn2+/Mn3+, Ni2+ y ... [+]
The Mg-Ti pseudobrookite or karroita (MgTi2O5) is being studied as host structure
for the development of ceramic pigment forming solid solution with different
chromophores ions (Co2+, Cr4+, Fe3+, Mn2+/Mn3+, Ni2+ y V2+). In recent studies, Cr-MgTi2O5
and V- MgTi2O5 pigments showed brown and pink colours, respectively, that were stable at
low temperature glazes (<1050°C). Accordingly, this investigation is based in the study of
Zn co-doping effect on these ceramic pigments, observing its influence on their stability
against decomposition, the possible modification of their optical (colour) properties and
also their pigmenting performance (stability) within ceramic glazes.
For this purpose several solid solutions of Mg(1-x)ZnxTi1.9Cr0.1O5 pseudobrookite
(karrooite) and Mg(1-x)ZnxTi1.8V0.2O5 (karrooite) doped with Zn (x= 0, 0.2, 0.4, 0.6) were
prepared by traditional ceramic route using rapid firing conditions (1200-1400°C/3h). In
order to evaluate this Zn effect, the following characterization has been performed: XRD,
UV-VIS-NIR and colour measurement (CIE-L*a*b*) techniques.
XRD results showed that the Zn-doping had a destabilizing effect on karrooite
structure, give rise to secondary phases as rutile, ilmenite and zinc titanium oxide. In Zn-
Cr-karrooite samples were obtained yellow-orange colorations, which were less intense or
saturated (higher L*) and also less red and yellow (lower a* and b* values) with the
increase of Zn-doping. On the other hand, in Zn-V-karrooite samples were obtained brown
colorations, which were less intense or saturated (higher L*) and also less red (lower a*
value) and more yellow (higher b* values) with the increase of Zn-doping.
In the last part of this investigation selected compositions were also prepared
through the use of a metalorganic decomposition route (MOD-citrate) as non-conventional
synthesis method, using rapid firing conditions (1000-1200°C/3h) too. The main goal of this
part was analyze the advantages in reactivity and different properties like thermal and
chemical stability, and optical or colorimetric properties. The results obtained were similar
to those of the ceramic route, although it was able to reduce the amount of secondary
phases. [-]
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Treball de Final de Grau en Química. Codi: QU0943. Curs acadèmic 2015-2016
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