Karrooite green pigments doped with Co and Zn: Synthesis, color properties and stability in ceramic glazes

Llusar, M.; Bermejo, T.; Primo, J.E.; Gargori, C.; Esteve, Vicente; Monrós, G.

doi:10.1016/j.ceramint.2017.04.062

Cited by 17 publications

(10 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the pseudobrookite has been widely used as high-temperature insulation ceramics [24], water purification filters [25], and diesel particulate filters [23]. On the other hand, as an n-type semiconductor, the pseudobrookite exhibits excellent dielectric and impedance properties as well as suitable electronic structure, band gap, and solar spectral absorption properties, which can be used as photocatalytic materials [26-30], thermoelectric materials [31], gas sensors [32], humidity sensors [33], microwave absorbing materials [34], anode materials of solid oxide fuel cells [35], and ceramic pigments [36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

et al. 2022

J Adv Ceram

View full text Add to dashboard Cite

As a type of titanate, the pseudobrookite (MTi2O5/M2TiO5) exhibits a low thermal expansion coefficient and thermal conductivity, as well as excellent dielectric and solar spectrum absorption properties. However, the pseudobrookite is unstable and prone to decomposing below 1200 °C, which limits the practical application of the pseudobrookite. In this paper, the high-entropy pseudobrookite ceramic is synthesized for the first time. The pure high-entropy (Mg,Co,Ni,Zn)Ti2O5 with the pseudobrookite structure and the biphasic high-entropy ceramic composed of the high-entropy pseudobrookite (Cr,Mn,Fe,Al,Ga)2TiO5 and the high-entropy spinel (Cr,Mn,Fe,Al,Ga,Ti)3O4 are successfully prepared by the in-situ solid-phase reaction method. The comparison between the theoretical crystal structure of the pseudobrookite and the aberration-corrected scanning transmission electron microscopy (AC-STEM) images of high-entropy (Mg,Co,Ni,Zn)Ti2O5 shows that the metal ions (M and Ti ions) are disorderly distributed at the A site and the B site in high-entropy (Mg,Co,Ni,Zn)Ti2O5, leading to an unprecedentedly high configurational entropy of high-entropy (Mg,Co,Ni,Zn)Ti2O5. The bulk high-entropy (Mg,Co,Ni,Zn)Ti2O5 ceramics exhibit a low thermal expansion coefficient of 6.35×10−6 K−1 in the temperature range of 25–1400 °C and thermal conductivity of 1.840 W·m−1·K−1 at room temperature, as well as the excellent thermal stability at 200, 600, and 1400 °C. Owing to these outstanding properties, high-entropy (Mg,Co,Ni,Zn)Ti2O5 is expected to be the promising candidate for high-temperature thermal insulation. This work has further extended the family of different crystal structures of high-entropy ceramics reported to date.

show abstract

Section: Introductionmentioning

confidence: 99%

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

et al. 2022

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…O zinco incorporado na estrutura em forma de óxido não contribui com a cor do pigmento [41,42], porém possibilita a incorporação de metais de transição em posições tetraédricas [43]. A partir da incorporação de uma pequena quantidade de níquel na estrutura da willemita é possível obter pigmentos de cor azul turquesa [22,44], enquanto a olivina de níquel possui cor verde [45]. No entanto, a interação química e física entre pigmento e esmalte, assim como variações no processo de queima, pode afetar a aparência final da peça cerâmica [46].…”

Section: Introductionunclassified

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

2019

View full text Add to dashboard Cite

Resumo Sintetizaram-se pigmentos do sistema Zn2-xNixSiO4 variando a proporção molar de zinco e níquel, partindo da estrutura willemita (Zn2SiO4) à olivina (Ni2SiO4), usando areia descartada de fundição (ADF) e sílica comercial como fontes de SiO2. A ADF foi caracterizada por análise química e DRX. A síntese dos pigmentos seguiu rota cerâmica, com x = 0, 0,5, 1, 1,5 e 2,0 mol e calcinação a 1200 °C. Os pigmentos foram caracterizados mediante DRX e medidas colorimétricas. Os resultados mostraram que, apesar da presença de alumina e ferro na ADF, as fases cristalinas e cor dos pigmentos foram similares para ambas as fontes de sílica. Teores menores de níquel favoreceram a formação de willemita e maiores a de olivina. Todos os pigmentos (com e sem ADF) dispersos em dois esmaltes e queimados em forno semi-industrial desenvolveram coloração marrom, indicando instabilidade destes nas matrizes usadas, mas confirmando a viabilidade de substituição da sílica comercial por ADF.

show abstract

“…Cobalt based green colored inorganic pigments are also available. Green coloration in ZnO:Co is due to the incorporation of Co 2+ ions in the tetrahedral site of wurtzite and in the karroite green pigments doped with Co and Zn in which Co 2+ ions occupies in the octahedral site ,. Jian Zou et al.…”

Section: Introductionmentioning

confidence: 99%

Intense Blue Colors in Wolframite‐Type Co²⁺:MgWO₄ Oxides Through Distortion in Co²⁺ Octahedra.

et al. 2018

View full text Add to dashboard Cite

New inorganic cobalt based blue pigments Mg1‐xCoxWO4 (x = 0.1, 0.2 and 0.3) have been prepared by the solid state reaction and flux added methods. The synthesized samples show intense blue color with very low doping concentration of cobalt. Raising cost and toxicity make a critical need to reduce the consumption of cobalt in the ceramic industry, at the same time trying to improve the efficiency and sustainability of pigments. The present investigation help us minimize the cobalt consumption and cost of production with respect to conventional blue ceramic colorants. Intense blue hue was obtained at relatively low doping concentration of Co2+ (20 mol%) with b* value of −46.97, which is considerably bluer than cobalt aluminate spinel (b* = ‐32.70). UV‐visible absorption properties are strongly related to the coordination environment of the Co2+ ions. Increasing the amount of cobalt induces a change in the local symmetry of MgO6 octahedra witnessed by the change of the metal‐ligand bond distances.The changes are attributed to the larger ionic radius and electronegativity of Co2+ ions compared to the Mg2+ ions in the host lattice.These observations corroborate the important structural distorsions arising from the differences in ionic radii and electronegativity between the dopant and host cations.

show abstract

Karrooite green pigments doped with Co and Zn: Synthesis, color properties and stability in ceramic glazes

Abstract: green pigments doped with Co and Zn: synthesis, color properties and stability in ceramic glazes, Ceramics International,

Cited by 17 publications

References 38 publications

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

Intense Blue Colors in Wolframite‐Type Co²⁺:MgWO₄ Oxides Through Distortion in Co²⁺ Octahedra.

Contact Info

Product

Resources

About

Karrooite green pigments doped with Co and Zn: Synthesis, color properties and stability in ceramic glazes

Abstract: green pigments doped with Co and Zn: synthesis, color properties and stability in ceramic glazes, Ceramics International,

Cited by 17 publications

References 38 publications

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

New class of high-entropy pseudobrookite titanate with excellent thermal stability, low thermal expansion coefficient, and low thermal conductivity

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

Intense Blue Colors in Wolframite‐Type Co2+:MgWO4 Oxides Through Distortion in Co2+ Octahedra.

Contact Info

Product

Resources

About

Intense Blue Colors in Wolframite‐Type Co²⁺:MgWO₄ Oxides Through Distortion in Co²⁺ Octahedra.