synthesis conditions, calcinations temperature [7–9]. It is
further studied by admixture of various lanthanides like La2O3,
Sm2O3, Nd2O3 and Gd2O3 [10–13]. However, the serious
problem associated with these pigments is lack of thermal
stability due to reduction of Ce(IV) oxide to Ce(III) oxide
accompanied by releasing oxygen and the color tends to orange
[14]. Hence, the above investigations have not lead to improve
the red hue of the pigment to form a viable alternate to the
traditional toxic red pigments. Terbium-doped ceria prepared
through classical and non-conventional co-precipitation routes
as environmentally friendly reddish ceramic pigments were
investigated for the optimal composition and synthesis methods
to get very nice reddish colorations [15].
CeO2 is a fluorite-structured oxide where fcc packed Ce4+
ions are surrounded by eight oxygens, occupying alternate
centers of tetrahedral cavities in the fcc lattice [16], that can
form extensive solid solutions with a variety of alien cations
while retaining the fluorite crystal structure. Ln–CeO2 (Ln = Pr,
Tb, Eu) and M–CeO2 solid solutions M = Cr or In, have been
reported as low-toxicity red ceramic pigments [16]. According
to Jørgensen and Rittershaus [17] the red color of the
praseodymium-doped samples is related to a charge-transfer
synthesis conditions, calcinations temperature [7–9]. It isfurther studied by admixture of various lanthanides like La2O3,Sm2O3, Nd2O3 and Gd2O3 [10–13]. However, the seriousproblem associated with these pigments is lack of thermalstability due to reduction of Ce(IV) oxide to Ce(III) oxideaccompanied by releasing oxygen and the color tends to orange[14]. Hence, the above investigations have not lead to improvethe red hue of the pigment to form a viable alternate to thetraditional toxic red pigments. Terbium-doped ceria preparedthrough classical and non-conventional co-precipitation routesas environmentally friendly reddish ceramic pigments wereinvestigated for the optimal composition and synthesis methodsto get very nice reddish colorations [15].CeO2 is a fluorite-structured oxide where fcc packed Ce4+ions are surrounded by eight oxygens, occupying alternatecenters of tetrahedral cavities in the fcc lattice [16], that canform extensive solid solutions with a variety of alien cationswhile retaining the fluorite crystal structure. Ln–CeO2 (Ln = Pr,Tb, Eu) and M–CeO2 solid solutions M = Cr or In, have beenreported as low-toxicity red ceramic pigments [16]. Accordingto Jørgensen and Rittershaus [17] the red color of thepraseodymium-doped samples is related to a charge-transfer
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