Abstract
A new chromium doped powellite (Cr–CaMoO4) yellow ceramic pigment alternative to yellow of praseodymium-zircon has been synthesised and characterised in order to analyse: (a) the stoichiometry of the solid solution, (b) the effect of the dopant concentration under the pigmenting properties, (c) the effect of the chromium precursor and mineralizers addition, (d) the effect of the synthesis method. The composition CrxCaMo1−xO4x=0.075 using K2Cr2O7 or Cr2O3 as chromium precursors fired at 1000–1100°C produces a yellow colour, slightly lower in intensity than the commercial praseodymium-zircon yellow pigment in double (1000°C) or single firing (monoporosa—1080°C or porcelainized stoneware—1200°C) ceramic glazes. By a coprecipitation method with ammonia, and firing at 950°C, the yellow ceramic pigment glazed in a conventional CaO–ZnO–SiO2 glaze (monoporosa glaze, 1080°C) shows a yellow colour similar to the commercial praseodymium-zircon yellow pigment. However the release and possible mobilization of the Cr (VI) should be controlled in order to get its industrial implementation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.