Iron-57 Mossbauer spectroscopy study of phases in the CaZrTi2-2xNbxFexO7 zirconolite system

摘要

Materials of composition CaZrTi2-2x Nb (x) Fe (x) O-7 with the fluorite-related zirconolite structure have been prepared. The Fe-57 Mossbauer spectra show that iron is initially located in the five co-ordinate cation sites. As the iron content increases the iron enters the octahedral sites until, at a composition CaZrTi0.4Nb0.8Fe0.8O7, ca. 50 of the iron is five co-ordinate and the remainder is located in the octahedral sites.