Influence of temperature and dopant concentration on structural, morphological and optical properties of nanometric Ce1−Er O2−δ (x = 0.05–0.20) as a pigment

Abstract

Influence of temperature and dopant concentration on structural, morphological and optical properties of nanometric Ce1-xErxO2-(x = 0.05-0.20) as a pigment This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. KAUST Repository M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractCeramic pigments based on cerium oxide were synthesized by self-propagating room temperature method and their color properties were assessed from the viewpoint of potential environmentally nontoxic pink pigments. Thermal stabilities of the pigments were examined at 600, 900 and 1200 ºC. According to X-ray powder diffraction and Raman spectroscopy results, all obtained pigments were single-phase solid solutions of cerium oxide, independent of the concentration of dopants. The X-ray analysis showed that the crystallites were of nanometric dimensions, as recorded and by transmission electron microscopy analysis. Color characteristics of solid solutions, which depended on concentracion erbium ions and calcination temperature, M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTand their position in the chromaticity diagram were studied by ultraviolet-visible spectrophotometry, which confirmed potential application of environmentally friendly pigments of desired color. The color efficiency of pigments was also evaluated by colorimetric analysis.

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

“…Researches have been increasingly focused on the development of new nanosized ceramic pigments, in particular based on cerium(IV)-oxide (CeO 2 ), with D. Mićović et al / Processing and Application of Ceramics 13 [3] (2019) 310-321 the goal of spreading the range of applications of ceramic pigments [12][13][14][15]. Thanks to their high thermal resistance, chemical stability (low corrosion) and very good optical and colouristic properties, ceramic pigments based on CeO 2 are increasingly used nowadays [6,7,9,10,12,13,16]. They attract particular attention because of ability to filter ultraviolet (UV) radiation and protection capabilities from the effects of solar light (UV, VIS and IR light) when applied in the form of coloured coating [13,14].…”

“…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].…”

“…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]. The colouring mechanism is based on the charge transfer transition from O 2p to Ce 4f within the CeO 2 band structure, which can be modified by the introduction of an additional electronic level between the anionic O 2p valence band and the cationic Ce 4f conduction band [7].…”

“…The colouring mechanism is based on the charge transfer transition from O 2p to Ce 4f within the CeO 2 band structure, which can be modified by the introduction of an additional electronic level between the anionic O 2p valence band and the cationic Ce 4f conduction band [7]. The process of ceria (CeO 2 ) doping with different ions (Ru 3+/4+ , Yb 3+ , Er 3+ , Y 3+ , Gd 3+ , Sm 3+ , Dy 3+ , Nd 3+ , Pr 3+/4+ ) by using the self-propagating reaction at room temperature (SPRT method) has proven to be a very easy and unique way to obtain pigments with stable structure, morphology and optical properties [12,[23][24][25][26][27]. The SPRT procedure, which is one of the most promising because of several advantages over conventional methods [12,[23][24][25][26][27], is based on the self-propagating room temperature reaction between metal nitrates and sodium hydroxide, whereby the required equipment is extremely simple and inexpensive.…”

“…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.…”