SYNTHESIS AND PHYSICAL-CHEMICAL PROPERTIES OF COMPOUNDS OF PbLnBiS4 (Ln=La÷Er)
The PbBi2S4–PbNd2S4 system of Pb–Bi–Ln–S quaternary system was studied by using physico-chemical analysis methods and the formation of quaternary sulfide PbNdBiS4 melting congruently at 1145 K was determined. Compound PbNdBiS4 is a phase of variable composition. For the first time the compunds of PbLnBiS4 (Ln=La÷Er) type have been synthesized and their standart thermodynamic functions have been calculated.
Keywords : congruence, eutectics, peritectics, quaternary systems, thermodynamic functions
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