Anomalous diffraction and cationic composition of a nanometric titanomagnetite

Materials such as titanium substituted ferrites are interesting for the stu dy of chemical reactions like oxidizing or reducing in compounds with spine l structure. These compounds synthesized by soft chemistry were studied by in-situ anomalous powder diffraction in various annealing conditions. In th e particular case of Fe2.5Ti0.5O4, the first results show that this particu lar ferrite can't be obtained directly by soft chemistry with the expected composition. Indeed, the rate of Ti substitution measured by structural ana lyses is well under that expected (0.5) whereas chemical analyses (ICP) con firm this rate.