Synthesis and characterization of the nanometric Pr-doped ceria

The influence of short thermal treatment on structure, morphology and optical properties of Er and Pr doped ceria pigments: Comparative study

“…1. Regardless of the dopant type or heat treatment temperature, all obtained solid solutions exhibited the single-phase fluorite crystal structure with Fm3m space group [18]. High solubility of the dopants in the obtained solid solutions and retaining of the fluorite crystalline structure can be attributed to their nanometric dimensions.…”

“…The starting chemicals were hand mixed [18,26] in alumina mortar for 15 min and then exposed to air for 3 h, which provided required energy for total termination of reaction according to the equation (1). For the removal of NaNO 3 the entire mixture was dispersed in water, and rinsing was performed in a Centurion 102 D centrifuge at 3000 rpm for 10 min.…”

“…In order to enable development of environmentally non-harmful ceramic pigments based on CeO 2 , many problems have to be solved starting with those related to powder synthesis. The syntheses of ceramic pigments are each time more focused on obtaining CeO 2 pigments in the form of fine nanosized particles with high surface area, because these features influence colour intensities [12,17,18]. Namely, the properties of the obtained pigments can be controlled by the incorporation of another element into the CeO 2 lattice using different processes of synthesis and modification [12,[19][20][21][22][23].…”

“…Because of the above mentioned advantages, CeO 2 doped with Er 3+ and Pr 3+ (Ce 1-x Er x O 2-δ and Ce 1-x Pr x O 2-δ ; x = 0.05), as new potential environmentally friendly non-toxic ceramic pink and red pigments, were synthesized using the SPRT method [12,18,24,26]. The parameter δ denotes oxygen deficiency, i.e.…”

“…Thermal treatment lasted only for 15 min because the ceramic pigment (Ce 1-x Pr x O 2-δ ; x = 0.05) very quickly reached different hues of red colour at 600, 900 and 1200°C. In addition, praseodymium (Pr 3+ ) was selected as a very suitable candidate for obtaining ceramic pigments with a range of shades of red colour [18], because of its lower valence state, comparing with ceria, and good incorporation in its crystal lattice. Furthermore, Pr 3+ doped CeO 2 has still been unused up to now as a ceramic pigment for colouring of different oxides and glass for the application in industrial production [28,29].…”