Novel environment friendly inorganic red pigments based on Bi₄V₂O₁₁

Abstract

Novel environment friendly inorganic red pigments, (Bi 1ÀxÀy Zr x Al y ) 4 V 2 O 11+d (0 # x # 0.15; 0 # y # 0.10), were successfully synthesized by a conventional solid state reaction method, and their colour properties were characterized. The colour of the obtained pigments was dependent on the calcination condition and the sample composition, and the highest red hue was obtained for the (Bi 0.92 Zr 0.07 Al 0.01 ) 4 V 2 O 11.34 pigment calcined at 800 C for 10 h in a flow of pure O 2 . The a* value corresponding to the red chromaticity of this pigment was +41.9, which was significantly greater than that of the commercial iron oxide pigment (a* ¼ +28.9). Bi 4 V 2 O 11 is considered to be a nontoxic compound, and the other components (Zr and Al) are also safe elements. Therefore, the present pigment could be an attractive candidate as a novel environment friendly inorganic red pigment.

Environmentally Benign Synthesis and Color Tuning of Strontium–Tantalum Perovskite Oxynitride and Its Solid Solutions

“…The changes in spectral shape after each resistance test are negligible. The color coordinate data were examined and the color difference (ΔE) was estimated from the color coordinate data before and after the examinations using the following equation 16 The color coordinate data of the samples before and after the heat, acid, and base resistant examinations are summarized in Table S5. ΔE values for after heat, acid, and base resistant examinations are 3.4, 4.1, and 4.3, respectively.…”

Effect of transition metal oxides addition on the color tone of Bi₄V₂O₁₁-based red pigments

“…C* and h values are also given. The undoped Bi 4 V 2 O 11 pigment and the BiTiVO, BiZrVO, and BiHf VO pigments showed relatively high 21) and b* values of 5 or less, and were low-saturation dark colors. The BiCuVO, BiMnVO, and BiCoVO had much lower C* (i.e., unvivid) and higher h (i.e., out of the red region).…”

“…Wendeus et al 21) examined Zr and Al-doped red pigments based on Bi 4 V 2 O 11 , and reported a relatively high redness (a* = 41.9) for (Bi 0.92 Zr 0.07 Al 0.01 ) 4 V 2 O 11.34 . They reported that the calcination in an oxygen atmosphere yielded a more reddish pigment.…”

Synthesis and characterisation of SrY2−xCexO4 as environmentally friendly reddish-brown pigments

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] In particular, development of novel red pigments has been required and several studies have been reported. [18][19][20][21][22][23][24][25][26][27] Among them, it has been reported that Ca 1Àx La x TaO 2Àx N 1+x and Ce 2 S 3 showed bright red colour. 18,19 But, unfortunately, harmful NO x and SO x are generated when these nitride and sulphide pigments are incinerated.…”