Crystal growth and characterization of Ce1-xPrxO2 (x≃0.05) single crystals

Abstract

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Red Pigments Based on CeO2–MO2–Pr6O11(M=Zr and Sn): Solid Solutions for the Coloration of Plastics

“…The compositions Ce 0.95 Zr 0.02 Pr 0.03 O 2 and Ce 0.95 Sn 0.02 Pr 0.03 O 2 exhibits better L * , a * , and b * values (47.63, 22.60, and 22.08) and (54.65, 22.35, and 23.26), respectively. It is clear from the L * a * b * values of the Ce 0.95 Zr x Pr 0.05− x O 2 and Ce 0.95 Sn x Pr 0.05− x O 2 pigments summarized in Tables I and II that the present values are significantly higher than the recently reported praseodymium‐doped ceria powders (5% praseodymium‐doped CeO 2 : L * =66; a * =12; b * =9.5), synthesized by a microwave‐assisted hydrothermal route 18 . Nahum et al 22 have reported similar color properties as found in the present study with Pr 4+ ‐doped ceria pigments calcined at 1400°–1500°C.…”

“…CeO 2 is a fluorite‐structured oxide that can form extensive solid solutions with a variety of alien cations while retaining the fluorite crystal structure. Praseodymium‐doped CeO 2 ceramic pigments are interesting because they produce colors ranging from brick red to dark brown, depending on the quantity of praseodymium, synthesis conditions, and the calcination conditions 18–22 . The substitution of other lanthanides such as La, Sm, Nd, and Gd in CeO 2 –PrO 2 have also been investigated and yielded various hues ranging from pink‐orange to yellow 23,24 .…”

Effective synthesis route for red-brown pigments based on Ce – Pr – Fe – O and their potential application for near infrared reflective surface coating

“…have been reported with a red hue. [27][28][29][30][31] Disadvantages of such methods could be those relating to cost, need for high calcination temperatures, release of toxic gases, etc.…”

Red ceramic pigments of terbium-doped ceria prepared through classical and non-conventional coprecipitation routes

“…coprecipitation of hydroxides, oxalates or carbonates, urea homogeneous coprecipitation, flux method, combustion, pirolysis, hydrothermal or microwaveassisted hydrothermal, and so forth). 1,2,5,21,33,[35][36][37][38][39][40][41] Noteworthy, previous investigations have demonstrated that ceramic pigments based on Tb-CeO 2 solid solutions may also yield good red hues, 20,21,42,43 which may be comparable to those obtained with Pr-CeO 2 . Nevertheless, the studies about synthesis optimization and pigmenting properties of Tb-doped ceria are still rather scarce, since most of research concerning this system is centred on catalytic or redox properties.…”