Effect of NH4F treatment on the chromaticity of the Ba2+-doped y-Ce2S3 red pigment / Xiu Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 541-552 Titre : Effect of NH4F treatment on the chromaticity of the Ba2+-doped y-Ce2S3 red pigment Type de document : texte imprimé Auteurs : Xiu Li, Auteur ; Yueming Li, Auteur ; Zhike Li, Auteur ; Zhumei Wang, Auteur ; Yan Hong, Auteur ; Fusheng Song, Auteur Année de publication : 2020 Article en page(s) : p. 541-552 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cerium Colorimétrie Pigments Pigments inorganiques Rouge (couleur) Index. décimale : 667.2 Colorants et pigments Résumé : The Ba2+-doped cerium precursor powder, (Ce, Ba)CO3, was successfully prepared via a co-precipitation reaction method using Ce(NO3)3·6H2O, Ba(NO3)3, and (NH4)2CO3 as raw materials. The above powder was placed in a muffle furnace and calcined at 1000°C for 120 min to obtain the corresponding oxide, (Ce, Ba)O2, subsequently, and the oxide was vulcanized at 850°C for 150 min with CS2 as a sulfur source to obtain the Ba2+-doped γ-Ce2S3 red pigment. The effects of different NH4F concentrations (1.0, 2.5, and 4.0 M) and treatment times (30, 60, 90, and 120 min) on the phase composition and chromaticity of the pigment were studied by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffractometry (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and CIELAB colorimetry. The SEM and EDS analyses revealed the presence of irregular flaky particles on the pigment surface after the NH4F treatment; the amounts of particles gradually increased with the NH4F concentration. The XRD and Raman spectra confirmed that these particles were CeF3 and CeFS heterophases. Furthermore, the Raman spectra denoted the presence of amorphous carbon. The XPS analysis demonstrated that the NH4F treatment did not change the valence of Ce (Ce3+ for γ-Ce2S3). The chromaticity of a sample reached its maximum (L* = 34.24, a* = 38.19, and b* = 39.95) after it was treated using 2.5 M NH4F for 60 min, indicating that the elimination of amorphous carbon can effectively improve the pigment chromaticity. Note de contenu : - EFFECT OF THE NH4F CONCENTRATION : Scanning electron microscopy and energy-dispersive spectroscopy analysis - Phase and structure analysis - X-ray photoelectron spectroscopy (XPS) analysis - Chromaticity analysis - DIFFERENT TREATMENT TIMES : SEM and EDS analysis - Phase analysis - Chromaticity analysis DOI : https://doi.org/10.1007/s11998-019-00304-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00304-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34002 [article]

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Study on synthesis and properties of Na+-La3+ co-doped γ-Ce2S3 pigment by low-temperature self-propagating combustion method / Boyuan Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1421-1430 Titre : Study on synthesis and properties of Na+-La3+ co-doped γ-Ce2S3 pigment by low-temperature self-propagating combustion method Type de document : texte imprimé Auteurs : Boyuan Wu, Auteur ; Yueming Li, Auteur ; Fusheng Song, Auteur ; Kai Li, Auteur ; Yi Sun, Auteur ; Zhumei Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1421-1430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chromaticité Valeur représentant la qualité d’une couleur sans comprendre sa luminance. Si deux lumières comprennent la même distribution spectrale normalisée par l’intensité, elles ont la même chromaticité, mais non pas vice versa. Particules -- Morphologie Pigments -- Synthèse Stabilité thermique Taille des particules Index. décimale : 667.2 Colorants et pigments Résumé : Na+-La3+ co-doped γ-Ce2S3 (abbreviated as γ-Na0.5Ce2.5 - xLaxS4) pigments with a fixed Na/(Ce1 - xLax) molar ratio of 0.2 (x = 0, 0.1, 0.5, 0.9, 1.3, 1.7, 2.1 and 2.5) were synthesized by low-temperature self-propagating combustion method. By adjusting the La3+ doping ratio, a series of γ-Na0.5Ce2.5 - xLaxS4 pigments with different colors were obtained by sulfurizing at 900°C for 2 h using CS2 as the sulfur source. The effects of La3+ doping amount on the synthesis of γ-Ce2S3, crystal structure, color performance, and temperature stability were systematically studied. The results show that the pigments exhibited a single cubic γ-Ce2S3 phase throughout the range of x increasing from 0 to 2.5. Compared with the co-precipitation method, the particle size of the pigment obtained by the low-temperature self-propagating combustion method decreased from 620 to 310 nm. Furthermore, as La3+ content increased, the band gap of the sample gradually increased from 2.06 to 2.90 eV, causing the color to change from red (L* = 39.42, a* = 40.35, b* = 30.28) to orange-red (L* = 49.15, a* = 35.51, b* = 40.64), then to orange-yellow (L* = 54.85, a* = 28.53, b* = 37.30), and finally to white-blue (L* = 66.66, a* = - 1.42, b* = 11.25). In addition, the thermal stability of γ-Na0.5Ce2.5 - xLaxS4 was evaluated by TG-DSC and its thermal stability increased from 350 to 480°C. Note de contenu : - EXPERIMENTAL : Precursor preparation - Sulfuration - Characterization - RESULTS AND DISCUSSION : Phase and structure analysis - Morphology, element content and distribution and particle size analysis - Chromaticity analysis - Temperature stability analysis DOI : https://doi.org/10.1007/s11998-023-000904-1 En ligne : https://drive.google.com/file/d/1OMWxzACQkSzKLVYqBCDbVu-TJqqeJ5IS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41308 [article]

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