Abstract
Magnetic susceptibility of a series of hypoeutectic Al-Yb alloys has been investigated in a wide temperature range from 300 to 1650 K. A step-like drastic change in the magnetic susceptibility at melting point has been discovered for the first time. The anomaly is interpreted as a temperature-induced valence transition. The substitution aluminum by gallium shifts the valence transition to room temperature. The valence states of ytterbium in both systems are discussed for solid and liquid phases.
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