Dilute alloys of Eu in ScAl₂ show single-ion anomalies in their transport properties. The susceptibility is intermediate between Eu²⁺ and Eu³⁺. The M\"ossbauer isomer shift is intermediate as well as strongly temperature dependent. This is the first case of microscopically confirmed configurational instability in any dilute rare-earth alloy.
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Steglich et al. (1980) studied this question.
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