X-Ray Diffraction and EXAFS Analysis

Schematic crystal structures of YAG. AI(VI) and AI(IV) are located at octahedral site and tetrahedral site, respectively [13]. 

Fe EXAFS spectra (Fig. 25.5) show that the environment of the iron ions is fairly similar in all five samples, indicating that in every sample a small number of iron ions occupy the same crystallographic site, which is supposed to be the B site. 

VSM curves of iron-doped yttrium aluminum oxides. In the case of x= 0.04, the recorded VSM data after annealing are also shown. (Reproduced with permission of the American Chemical Society.) 

In the case of the Y3(YAl4 (FeJ 0 2 samples, the magnetic susceptibility is significantly smaller than that of the Y3Als ,Fe (0 2 compounds however, the disappearance of ferromagnetism with increasing iron content above x 0.1 is a common feature [II]. 

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