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The oxidation state and the localization of the chromium ions in the ceramic matrix of Cr-doped cassiterite (SnO 2 ) and Cr-doped malayaite (CaSnSiO 5 ) pigments have been investigated through the use of X-ray absorption near-edge (XANES), extended X-ray absorption fine structure (EXAFS), optical absorption and electron spin resonance (ESR) spectroscopies as well as by measurements...
Uniform nonagglomerated nanoparticles (~12 nm) with equiaxed shape and high specific surface area (~100 m 2 g -1 ), consisting of Pr-doped ceria solid solutions (Pr/Ce mol ratio=<0.2) have been prepared by aging at 100 o C for 2 h aqueous solutions of cerium (III) nitrate, praseodymium (III) chloride and hexamethylenetetramine. The Pr cations in such solid solutions...
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