Samarium valence in Ybsub(1-x)Smsub(x)S

In order to study the Ybsub(1-x)Smsub(x)S solid solution synthesis temperature effect on the samarium valence state samples of Ybsub(0.8)Smsub(0.2)S composition, produced by both low- and high-temperature methods were investigated. Samarium and ytterbium valences were determined by X-ray absorption α-spectroscopy at indoor temperature. The results obtained show, that the nouniphase character occuring in Ybsub(1-x)Smsub(x)S under cation defect presence, is an additional indication of trivalent samarium absence in solid solutions. Under the high-temperature synthesis sample oxidation and Smsup(+3) content increase take place, which is linked with Smsup(+3) presence in mixed oxysulfide