Zusammenfassung
The Aurivillius type oxide Bi1.9Te0.1SrNb1.9Hf0.1O9 has been studied by
Perturbed Angular Correlations spectroscopy using Ta-181 probes. The
spin precession curves were measured from room temperature up to 873 K.
Two sites are occupied by probes and the temperature dependence of both
indicates a continuous phase transition at about 625 K. One site is
ordered while the other is disordered. This situation is analyzed in
terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2-xTexSrNb2-xHfxO9 (with 0 <= x <=
0.5) shows a strong dependence on composition. (c) 2006 Elsevier Ltd.
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