Synthesis of non-toxic inorganic blue pigments in the melilite-type structure

Gramm, Georg; Fuhrmann, Gerda; Ploner, Kevin; Penner, Simon; Huppertz, Hubert

doi:10.1039/d0ma00541j

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Other Mn-containing compounds have also been studied for their colour such as brownmillerite and apatite type structures, although these colours tend to range from turquoise to dark green depending on manganese content [15][16][17][18][19]. The apatite material has the general formula A10(MO4)6X2 where typically A = Ca, Sr, Ba or La, M =Si, Ge, P or V and X = O, OH or halides [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Feeling blue: utilising cation ordering to engineer the colour of apatite pigments

Gardner,

James,

Wright

et al. 2023

Preprint

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Manganese doped chlorapatite compounds have attracted interest as inorganic pigments due to their vivid colours. In this paper, we investigate the effect of Sr incorporation in the turquoise pigment Ba10(MnO4)(PO4)5Cl2. on the structure and optical properties. The results show a turquoise colour throughout the series studied, except for a single compound, Ba6Sr4(MnO4)(PO4)5Cl2 which exhibits an intense blue hue. The colour change is explained by Ba/Sr cation ordering in the apatite structure, with this composition corresponding to complete occupation of the A1 site by Sr and the A2 site by Ba, and similar results are also observed for the related manganese doped bromoapatite system. The unique blue colour for these cation ordered compositions illustrates the potential to control the colour of apatite pigments through exploiting cation site preferences, while its’ low cost represents a key advantage compared to recently reported blue YIn1-xMnxO3 pigments.

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Section: Introductionmentioning

confidence: 99%

Feeling blue: utilising cation ordering to engineer the colour of apatite pigments

Gardner,

James,

Wright

et al. 2023

Preprint

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Effect of Ca addition on near-infrared reflection of SrCuSi4O10

Obata,

Konishi,

Okagami

et al. 2023

Chemistry Letters

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In this study, SrCuSi4O10 powders were synthesized by a complex polymerization method and the effect of Ca addition on the crystal structure and optical properties in the visible and infrared regions was examined. Crystalline SrCuSi4O10 was formed at 1000 °C in air. From the X-ray diffraction measurements, the (002) and (004) reflections of SrCuSi4O10 shifted to higher angles, and the lattice parameter (a and c) decreased with the addition of Ca, suggesting that Ca was successfully introduced into SrCuSi4O10. However, the lattice constant of SrCuSi4O10 increased with further addition of Ca to 10 mol%. Optical measurements of SrCuSi4O10 identified three optical absorption bands in the visible light region, attributed to the d-d transition of Cu2+: namely 2B1g → 2B2g (540 nm), 2B1g → 2Eg (628 nm), and 2B1g → 2A1g (800 nm). The addition of Ca decreased the intensity of these absorptions. The -b* value, which indicates blueness, was estimated using the L*a*b* color system, and SrCuSi4O10 with 5 mol% Ca showed the highest value among the measured samples. On the other hand, the reflectance of SrCuSi4O10 in the near-infrared region increased significantly with the addition of Ca. These results indicate that Ca addition is effective in improving the blue coloration and near-infrared reflectivity of SrCuSi4O10.

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Synthesis of non-toxic inorganic blue pigments in the melilite-type structure

Abstract: A series of novel melilite-type structured compounds of the general formula Sr2Mg1-xMnxGe2-ySiyO7 (0 ≤ x ≤ 1; 0 ≤ y ≤ 2) was produced by conventional solid-state syntheses and subsequently...

Cited by 2 publications

References 18 publications

Feeling blue: utilising cation ordering to engineer the colour of apatite pigments

Feeling blue: utilising cation ordering to engineer the colour of apatite pigments

Effect of Ca addition on near-infrared reflection of SrCuSi4O10

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