Low-temperature synthesis methods of doped apatite-type lanthanum silicates

Abstract

Al- and Sr-doped apatite-type lanthanum silicates (ATLS) have been prepared using mechanochemical activation (MA) and Pechini (Pe) methods. MA of a stoichiometric mixture in the high-power planetary ball mill provides the formation of a high purity crystalline ATLS at room temperature after 20-35 min activation. The phase composition and local structure of doped ATLS are determined by milling time and the dopant content. 5 min MA of carbonate precursors obtained via Pe method results in the formation of a single-phase ATLS at 900°C. Copyright © 2007 The Society of Chemical Engineers, Japan.