Study of Cr-SnO2 ceramic pigment and of Ti/Sn ratio on formation and coloration of these materials

Surface Segregation in Chromium‐Doped Nanocrystalline Tin Dioxide Pigments

“…The signals were corrected for channel-to-channel detector gain variations and background subtracted using an inverse power law. 12,19 If the same is true for nanopowders, the changes in the lattice parameters could be attributed to the difference between the radius of the dissolved Cr 4+ (0.55 Å ) and Sn 4+ (0.69 Å ). Spectra were collected by detecting the 23.8 keV gamma radiation from a Ca 119m SnO 3 source.…”

“…The EELS spectra were acquired with a pixel dwell time of 0.75 s, and dispersion of 0.2 eV/channel. 12,19 Moreover, it has been shown that only a small amount of Cr 3+ (250 ppm) is expected to be dissolved into the crystalline lattice of SnO 2 single crystals and micro powders. 17 Mo¨ssbauer measurements of powder samples were carried out at room temperature using a conventional constant acceleration type spectrometer.…”

“…11 Its coloration can only be achieved in a narrow range of chromium content, and evidences show that the coloration is only present if chromium is above its solubility limit in cassiterite. 12 In this article, we exploit the liquid precursor method to prepare SnO 2 nanoparticles with surface-segregated chromium ions, showing that the different oxidation states can also be induced at relatively low temperatures. This type of microstructure is typically obtained by a solid-state reaction at high temperatures (1400°C) to allow diffusion of chromium in the cassiterite matrix (with dissolved Cr 4+ ), and nucleation of a Cr 3+ phase.…”

SYNTHESIS OF SnO₂/Cr PIGMENTS DOPED BY PRASEODYMIUM PREPARED BY DIFFERENT METHODS AND THEIR PIGMENTARY PROPERTIES

“…Chrome Tin Orchid Cassiterite is most frequently prepared by a high-temperature calcination of homogenized mixture of SnO 2 and a small amount of Cr 2 O 3 [12,13]. The content of chromium in the compound effects the final colouration of pigment, which can gain various colour shades from light pink to deep violet [14,15].…”

Functional colored ceramic coatings obtained by thermal spray for decorative applications

“…Sn/V yellows, Sn/Sb blue-grays and Sn/Cr purple. [13][14][15][16][17] Violet chromium-doped cassiterite (SnO 2 ) and pink chromium-doped malayaite (CaSnSiO 5 ) are among the most frequently used chromium pigments in the ceramic industry for coloring glazes. 1,18 In fact, these pigments present very good thermal stability and are the only alternative nowadays to cadmium-containing pigments for deep burgundy shades in the pottery industry.…”