Ceramic pigment obtained by polymeric precursors

Cunha, Jardel Dantas da; Melo, D. M. A.; Martinelli, A. E.; Melo, M. A. F.; Maia, Ivan Ferrer; Cunha, Sílvio

doi:10.1016/j.dyepig.2004.06.005

Cited by 33 publications

(18 citation statements)

References 9 publications

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“…We have investigated the oxidation state of iron in lanthanum and holmium ferrites, the reason being a report [6] about the reduction of Fe(III) to Fe(II) in lanthanum ferrite synthesized by precursors at 1,100 • C. Mössbauer spectroscopy results in both ferrites show only Fe(III).…”

Section: Introductionmentioning

confidence: 97%

“…Most of the materials are used in ceramic as pigments A classification of the various inorganic pigments has been developed based on the crystal structures grouped in 14 classes, each of which represents substances of similar crystal structure [2][3][4][5], however, perovskite structure and the utilization of lanthanides in the pigment's chemical composition are not included. Nowadays lanthanum ferrite with perovskite structure is used as a ceramic pigment [6] and holmium ferrite represents a similar crystal structure. Both of them have colorimetric properties, thermal stability at high temperatures and fine particle size [7]; for these reasons holmium ferrite may also be used as a ceramic pigment.…”

Section: Introductionmentioning

confidence: 99%

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Mössbauer spectroscopy of lanthanum and holmium ferrites

et al. 2008

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Mössbauer spectroscopy of lanthanum and holmium ferrites

et al. 2008

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“…Resultados similares foram encontrados em outro trabalho [24]. Na literatura, vários autores sintetizaram LF por vários métodos: em um dos trabalhos, foi sintetizada a perovskita pelo método sol-gel, mas somente a 1200 °C foi obtida a fase sem vestígios de fase secundária [25]; enquanto em outro [26], foi obtida LF monofásica pelo método Pechini, porém somente em 900 °C. Tais resultados enfatizam o caráter vantajoso do método sol-gel proteico em relação às outras rotas tradicionais para obtenção de perovskitas monofásicas.…”

Section: Resultsunclassified

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

et al. 2018

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ResumoEsse trabalho teve como objetivo sintetizar óxidos com a estrutura tipo perovskita de composição LaFeO 3 , LaFe 0,8 Al 0,2 O 3 e LaFe 0,8 Cr 0,2 O 3 pelo método sol-gel proteico, visando sua aplicação como pigmento cerâmico. Os pós resultantes do processo de síntese foram calcinados a 600 e 800 °C e em seguida caracterizados por difração de raios X com refinamento Rietveld, microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), espectroscopia na região do UV-visível e colorimetria CIE-L*a*b*. De acordo com os difratogramas de raios X, todos os pós calcinados foram monofásicos com estrutura tipo perovskita ortorrômbica. As imagens de MEV e MET revelaram que os pós foram porosos e nanométricos. As ferritas de lantânio sem dopagem apresentaram cores em tons pastel, sendo mais claros nos pós dopados com alumínio. Já a ferrita dopada com cromo apresentou coloração marrom claro. As colorações foram mais intensas com o aumento da temperatura de calcinação. Palavras-chave: pigmento, gelatina, perovskita, ferrita. Abstract

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“…The color of each pigment is the result of the addition of chromophore ions (usually transition metals) in an inert matrix (oxide or oxide systems) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Various chemical methods, such as conventional ceramic method [2,14,15], combustion synthesis, co-precipitation [16], sol-gel method [2,17], polymeric precursor [1,18], microwave synthesis [19], and others, have been used to synthesize inorganic pigments. The complex polymerization method (CPM) based on the Pechini method offers the possibility of preparing complexes of good homogeneity at molecular scale and a good stoichiometric control.…”

Section: Introductionmentioning

confidence: 99%

Influence of variables on the synthesis of CoFe2O4 pigment by the complex polymerization method

et al. 2015

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Synthetic inorganic pigments are most widely used in ceramic applications due to their excellent chemical and thermal stability and their lower toxicity to both human and environment as well. In the present work, black ceramic pigment CoFe 2 O 4 has been synthesized by the complex polymerization method (CPM) with good chemical homogeneity. In order to study the influence of variables on the process of obtaining pigment through CPM, 2 (52) fractional factorial design with resolution III was used. The variables studied in the mathematical modeling were: citric acid/metal concentration, pre-calcination time, calcination temperature, calcination time, and calcination rate. Powder pigments were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible (UV-Vis) spectroscopy. Based on the results, the formation of cobalt ferrite phase (CoFe 2 O 4 ) with spinel structure was verified. The color of pigments obtained showed dark shades, from black to gray. The model adjusted to the conditions proposed in this study due to the determination coefficient of 99.9% and variance (R²) showed that all factors are significant at the confidence level of 95%.

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Ceramic pigment obtained by polymeric precursors

Cited by 33 publications

References 9 publications

Mössbauer spectroscopy of lanthanum and holmium ferrites

Mössbauer spectroscopy of lanthanum and holmium ferrites

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

Influence of variables on the synthesis of CoFe2O4 pigment by the complex polymerization method

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