Temperature resistant red and purple ceramic pigments based on the solid solution series BaZn2−xNixSi2O7 and BaMg2−xNixSi2O7

Synthesis and characterisation of Ba(Zn1−xCox)2Si2O7 (0 ≤ x ≤ 0.50) for blue-violet inorganic pigments

“…Because 24 In this study, Ba(Zn 1Àx Co x ) 2 Si 2 O 7 (0 # x # 0.50) pigments were synthesized by a conventional solid-state reaction method, and the colour properties of the pigments were investigated as novel blue-violet inorganic pigments.…”

“… 22,23 As a related compound, Ba(M, Ni) 2 Si 2 O 7 (M = Zn or Mg) pigments have been ever reported, but they exhibit red and purplish red colours due to the d–d transition of the tetrahedral coordinated Ni 2+ . 24 In this study, Ba(Zn 1− x Co x ) 2 Si 2 O 7 (0 ≤ x ≤ 0.50) pigments were synthesized by a conventional solid-state reaction method, and the colour properties of the pigments were investigated as novel blue-violet inorganic pigments.…”

Exploring the Colour of 3d Transition‐Metal Ions in Trigonal Bipy­ramidal Coordination: Identification of Purple‐Blue (CoO5) and Beige‐Red (NiO5) Chromophores in LiMgBO3Host

“…CIE chromaticity diagram ( Figure 7 and [20] Whereas a number of Co II oxides in tetrahedral coordination are known (for example spinel CoAl 2 O 4 , and Zn 1-x Co x Al 2 O 4 , [28] willemite Co x Zn 2-x SiO 4 , [29] Co 2 SnO 4 , [30] and Co-doped ZnO [31] ), which are blue in colour (except the latter, which is green), very few Ni II oxides in tetrahedral coordination are known: Ni-doped β-Al 2 O 3 , [20] Ni-doped hibonite (CaAl 12 O 19 ) [32] and BaZn 2-x Ni xSi 2 O 7 , [20] to our knowledge, displaying green, turquoise, and red colours.…”

“…[19] Similarly, Ni II → Mg II (distorted TBP) substitution in BaMgSi 2 O 7 produces an unusual red colour. [20] The foregoing examples of recently synthesized, coloured transition-metal oxides suggest that oxides containing five coordinated (especially TBP) nontransition-metal atoms (where transition metal atoms could be doped) would serve as hosts for the development of new coloured oxides of potential interest as pigments. Towards this end, we have identified LiMgBO 3 (space group: C2/c, a = 5.161 Å, b = 8.880 Å, c = 9.911 Å and β = 91.29°) as a possible host in which Mg II occurs in a TBP oxygen coordination.…”

Inorganic Green Pigments Based on LaSr2AlO5

“…In the case of M = Fe, weak optical absorption due to the d-d transition of Fe 3+ [22] was observed in the visible region around 420 nm. When M was Ni, the sample absorbed visible light around 650 nm because of the d-d transition of Ni 2+ [23]. The sample with Cu absorbed visible light less than 400 nm and longer than 700 nm.…”