Abstract
In CeFe 2, CeCo 2 and CeNi 2 below 100 K, measured values of the lattice constant, thermal expansion coefficient, intensities of X-ray diffraction lines (hkl) and resistivity exhibit similar anomalies which are closely correlated with the valence variation of the Ce ion. The intensities of the diffraction lines in the CeCo 2 and CeNi 2 samples suggest that these substances can be considered as a combination of two MgCu 2 structures with two different lattice constants a 1 and a 2 ( a 2< a 1). The ratio of the numbers of crystal unit cells belonging to the two different phases is N(a 1) N(a 2) = 9 ). We endeavour to give a quantitative explanation of the abnormal variation in the Ce ion valence with temperature on the basis of the Anderson model applied to an “alloy”, i.e. a mixture of two different phases. The anomalous behaviour of the Ce valence vs. temperature is also described on the basis of the phenomenological model of a “dynamic alloy”.
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