SYNTHESIS AND STUDY OF SYNTHETIC ANALOGUES OF NUFFIELDITE MINERAL WITH RARE EARTH ELEMENTS

Abstract

Cu2LnSb3S7 and Cu2LnBi3S7 type compounds were synthesized by direct ampullary method and
their monocrystals were grown by crystallization. It was determined that these compounds are isostructural and crystallize in orthorhombic syngony (Cu2LnSb3S7 – a = 14.26÷14.43, b=21.20÷21.42,
c= 3.80÷3.90Å; Cu2LnBi3S7 – a = 14.50÷14.72, b = 21.56÷21.86, c = 3.96÷4.14Å; Z = 4) and are
semi-conductors with p-type conductivity. Their band gap varies at ∆E-0.53÷0.90 eV interval.
Keywords: compound, synthesis, nuffieldite, semiconductors