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2577
In this case the Zn-free samples show negative values for a*
(greenish) and b* (blue), while samples ZnCoAl0X/1200 show
positive b* values.
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We have compared the colour parameters of these samples
with those for a set of similar solids (i.e., with the same chemical
composition) prepared by calcination of mixed chlorides and with
the same crystalline structure (mixed spinels). This last set of
samples shows a larger luminosity whichever the chemical
composition, on comparing with the samples here studied, and
luminosity is very dependent on the chemical composition, L* and
a* increasing with the aluminum content, while parameter b* is
more negative for the Al-rich samples. No effect of the presence of
Zn is observed. The sample reported by Pacurariu et al. [9] with
the same composition as our ZnCoAl01 sample, but calcined at
900 1C, shows also a larger L* value, and a* and b* values close to 5
and ꢁ14, respectively, i.e., the sample is less greenish, but deeper
blue. In other words, the samples prepared in this study show a
lower luminosity than those reported in previous studies, thus
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From these results, we should conclude that the colour of
ceramic pigments containing Co and Al is mostly depending on
the presence of additional ZnII cations, and not on the precise
molar percentage of the colour-responsible cation (cobalt). The
presence of NaAlO2 has no effect on the colour of the calcined
solids and is easily removed by gentle washing.
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Two series of solids with the spinel containing Co and Al, or Co,
Zn, and Al, aimed to be used as ceramic pigments, have been
prepared by calcination of layered double hydroxides, with
different divalent/trivalent molar ratios and Zn/Co molar ratio 1.
The crystallinity of the precursors decreases as the aluminum
content increases, and formation of other phases, containing
sodium is observed in these Al-rich samples. Decomposition of
the layered materials at 1200 1C leads to formation of spinels with
only minor amounts of other phases (mainly ZnO and CoO), as
well as NaAlO2, which is easily removed by washing with water.
The particle size of the precursors is also dependent on the
divalent/trivalent ratio. While the precursors show a pink colour
(lighter for those samples containing Zn), the calcined samples are
dark blue or dark green, depending on the absence or presence of
zinc. The properties of the calcined solids can be easily tuned from
the composition and decomposition procedure of the precursors,
providing homogeneous solids.
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Financial support from MEC (Grant MAT2006-10800-C02-01),
´
ERDF and Junta de Castilla y Leon (Grant SA024A06) is greatly
acknowledged. Authors also thank Dr. M. Herrero and Mr. A.
Montero for their assistance to obtain some of the experimental
results.
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