A rietveld study of the cation substitution between uvarovite and yttrium‐aluminum synthetic garnets, obtained by sol‐gel method

A series of synthetic garnets solid solutions is compositions between Y 3 Al 2 Al 3 O 12 (Y‐Al garnet) (YAG) and Ca 3 Cr 2 Si 3 O 12 (uvarovite) was synthesized using the sol‐gel method. The expected general formula is (Ca x Y 1‐ x ) 3 (Cr x Al 1‐ x ) 2 (Si x Al 1‐ x ) 3 O 12 where x = 0 to x = 1. The cation distribution in dodecahedral, octahedral and tetrahedral sites and bond distances in these synthetic garnets were determined using the Rietveld method. It shows the incomplete substitution in small sites. The smaller site the smaller substitution there is.