Samarium is a lanthanide that preferentially exists in the +3 oxidation state. Samarium compounds are useful as catalysts which have been employed in a large number of chemical reactions. Catalysts are very important in chemistry and are used in more than 80% of industrial processes. Since chemical processes transform raw materials into products, it is important that these reactions are relatively quick and selective so they can be considered for an industrial scale. This book discusses samarium compounds, and continues to provide information on the Sm-complex/polymer composite; activation procedures of SmI2 and its utilization for organic reactions; a comparison of Sm(III) and Cr(VI) ions; and potential applications of samarium as a dopant element.