Abstract
X-ray absorption near edge structure (XANES) measurements on LII edge of Sm are employed to study the intermediate valence in SmSe1-x Asx (0.0 ⩽ x ⩽ 1.0) solid solutions in which the substitution of trivalent anion As for Se2− drives Sm to a higher valence from divalent towards trivalent in the SmSe lattice. Two absorption peaks corresponding to two different valent states of Sm provide direct evidence for mixed valence of Sm in these alloys. The split white line at the LII edge of Sm is used to determine the Sm mean valence in the alloys. Average valence data deduced from Sm LII edge XANES shows a continuous valence transition with increasing As concentration upto 80 at.% of As. At 90 at.% of As the Sm is fully converted into trivalent state. Mean valence data for Sm shows fair agreement with those measured employing other techniques.
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