Cr-doped titanite pigment based on industrial rejects

Hajjaji, W.; Zanelli, Chiara; Seabra, M.P.; Dondi, Michele; Labrincha, J.A.

doi:10.1016/j.cej.2009.12.026

Cited by 18 publications

(9 citation statements)

References 21 publications

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“…The malayaite structure consists of infinite chains of vertex-sharing SnO 6 octahedral linked by isolated SiO 4 tetrahedral, structures of which are appropriate for the incorporation of metal ions colored pigments. The formation of malayaite is more favored and the amount of cassiterite is reduced, as reported by Piña et al (2005); Yongvanich et al (2018); and Hajjaji et al (2010).…”

Section: Resultssupporting

confidence: 59%

The effect of mineralizer addition and temperature on synthesis of malayaitepink pigment

Mehrabi

Rezaie

Yekta

2021

PRT

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Purpose This study aims to the effect of NaF, Li2CO3 and H3BO3 minerals was investigated, and the best mineralizer was found to be H3BO3. Furthermore, the effect of temperature was investigated, and the synthesized samples were calcined at temperatures of 1100, 1200 and 1300 °C to select the optimum calcination temperature. Design/methodology/approach This study was aimed at thoroughly investigating the effects of mineralizer addition and temperature on the synthesis of malayaite pink pigment based on raw materials of SnCl2-SiO2-Ca(OH)2-K2Cr2O7. To this end, the optimization of the synthesis parameters such as mineralizer addition and temperature was completely perused. Findings The optimum temperature was 1300 °C, and the color efficiency of pigments was evaluated by colorimetric (CIE L*a*b* system) analysis, and these parameters were close to those of industrial pigments. Originality/value To the best of the authors’ knowledge, for the first time, the effect of mineralizer addition and temperature on the synthesis of malayaite pink pigment was investigated through the sol-gel method. Herein, different parameters were optimized to propose a novel pigment with a much better performance.

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Section: Resultssupporting

confidence: 59%

The effect of mineralizer addition and temperature on synthesis of malayaitepink pigment

Mehrabi

Rezaie

Yekta

2021

PRT

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“…It can be observed from the colour measurements that a dark brown colour has been obtained from the Cr 1.3 Fe 0.7 O 3 nanopigments prepared by the sol-gel method. The dark brown colour, expressed as the lower colorimetric parameter L * compared to brown ceramic pigment that has been reported in literatures (Ló pez-Navarrete et al, 2003;Candeia et al, 2007;Hajjaji et al, 2010;Costa et al, 2008).…”

Section: Colorimetric Analysismentioning

confidence: 80%

“…These two sequential absorptions located in the violet (405 nm) and green-blue (500 nm) zones are responsible for the brown colour displayed by the pigment. The band around 580 nm could be related to spin-forbidden transitions Cr 3þ (d 3 electronic configuration) (Hajjaji et al, 2010). Also, the bands at higher energies (i.e.…”

Section: Morphology Of Samplesmentioning

confidence: 95%

“…Cr-doped metal oxide materials have been also widely investigated as ceramic pigments (Lyubenova et al, 2008;Pavlov et al, 2002;Dondi et al, 2006;Marinova et al, 2003). The brown colour of the pigments can be attributed mainly to the existence of Cr and Fe as chromophore ions (Ló pez-Navarrete et al, 2003;Candeia et al, 2007;Hajjaji et al, 2010;Costa et al, 2008). The inorganic pigments with a suitable particle size distribution have been extensively explored due to their high temperature stabilities, excellent hardness and resistance against acids and alkalis.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterisation and optical band gap of Cr_1.3Fe_0.7O₃ nanopigments

Enhessari

2013

Pigment &Amp; Resin Technology

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Purpose -Inorganic pigments have been widely investigated due to their chemical stability such as resistance to chemical attacks by acids and alkalis, excellent hardness and high temperature stability. Cr 1.3 Fe 0.7 O 3 which is considered as a ceramic nanopigment also seems to be a highly efficient photovoltaic material. The paper aims to discuss these issues. Design/methodology/approach -In this work, the paper reports the synthesis of a novel and high purity Cr 1.3 Fe 0.7 O 3 nanopigment via sol-gel process using stearic acid as complexing agent. The method includes formation of an organic precursor with metallic cations homogeneously distributed all over the matrix. Sample characterisations were performed by X-ray diffraction, electron microscopy, UV-vis diffused reflectance spectra and photoluminescence. The transport properties and colour characteristics were also investigated by spectroscopic and technological characterisation of the synthesised nanoparticles. Findings -The prepared nanopigments were uniform in distribution and a spherical morphology with an average size of about 200 nm was observed. Cr 1.3 Fe 0.7 O 3 nanoparticles showed a direct band gap value of 2.85 eV and the colour efficiency of the nanopigments evaluated by colourimetric analysis resulted characteristic values of L * ¼ 39.96, a * ¼ 3.67 and b * ¼ 3.12. Originality/value -This method for synthesis of nanopigments is novel and could be employed for various applications in synthesis of wide variety of nanoceramics.

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“…Especially Cr-doped malayaite, due to its intense colouration, is used commonly as a pink ceramic pigment. Correspondingly, there are many papers addressing in detail the absorption of chromium and other chromophores in titanite-group minerals, and the use of these phases as thermally stable pigments (e.g., Stefani et al, 1997;Bartis et al, 2007;Hajjaji et al, 2010;Borcanescu et al, 2013). The luminescence of titanite-group minerals, in contrast, has been investigated in very few studies only, even though "titanite may be a very interesting luminescent material" (Gaft et al, 2005).…”

Section: Introductionmentioning

confidence: 99%