Ceramic Pigments from Mixed Hydroxides with the Hydrotalcite-Like Structure (pp.195-220)
Authors: (V. Rives, M.E. Pérez-Bernal, R.J. Ruano-Casero, I. Nebot-Díaz, GIR-QUESCAT, Departamento de Química Inorgánica, Universidad de Salamanca, Salamanca, Spain, and others)
Abstract: The preparation, characterisation and structural properties of layered double hydroxides with the hydrotalcite-like structure are described, as well as those of solids formed upon their thermal decomposition in air. Characterisation of these hydroxides by powder X-ray diffraction, Fourier Transform Infrared (FT-IR) spectroscopy, electron microscopy, thermal methods (thermogravimetric and differential thermal analyses) is described.
The most widely preparation methods used (namely, coprecipitation, salt-oxide method, urea hydrolysis, sol-gel, etc.) and post-synthesis treatments (ageing and hydrothermal treatment, both under conventional or microwave heating) are described and discussed.
The different factors controlling the properties of these hydroxides and those of the solids formed upon their thermal decomposition and their use as ceramic pigments are discussed. The method of preparation and the nature of the mixed hydroxides used provide a unique method for preparation of pigments with almost any pursued colour.