Gulay L. Crystal chemistry of chalcogenides and intermetallic compounds of rare earth and transition elements with Pb (Si, Ge, Sn та In)

The thesis is devoted to the study of crystallographic pecularities of chalcogenides and intermetallic compounds of rare earth and transition elements with Pb (Si, Ge, Sn and In). The isothermal sections of the phase diagrams of 29 ternary Gd-Fe-Pb, R-Co-Pb (R = Y, Sm, Gd), R-Ni-Pb (R = Y, La, Ce, Sm, Gd, Dy), R-Cu-Pb (R = Y, La, Ce, Sm, Gd, Dy), Y-Ag-Pb, M-Pb-{S, Se, Te} (M = Co, Ni, Cu, Ag) and 77 quaternary R2S3-Cu2S-SiS2 (R = Y, Pr, Sm, Ho), R2Se3-Cu2Se-SiSe2 (R = Y, Pr, Ho), R2S3-Cu2S-GeS2 (R = Y, Pr, Ho, Er), R2Se3-Cu2Se-GeSe2 (R = Y, Pr, Ho), R2X3-Cu2X-SnX (X = S, Se, Te), R2S3-Cu2S-SnS2 (R = Y, La, Pr, Sm, Tb, Dy, Er), R2Se3-Cu2Se-SnSe2 (R = Sc, Y, La, Sm, Dy, Er, Lu), Y2Se3-MSe-PbSe (M = Co, Ni), R2S3-Cu2S-PbS (R = Y, Pr, Sm, Tb, Dy, Ho, Er), R2Se3-Cu2Se-PbSe (R = Sc, Y, La, Pr, Sm, Tb, Dy, Ho, Er, Tm, Lu), R2Te3-Cu2Te-PbTe (R = Y, Tb, Dy, Ho, Er, Tm), R2S3-Ag2S-PbS (R = Ho, Er, Tm), R2Se3-Ag2Se-PbSe (R = Y, Pr, Ho, Er, Tm), R2Te3-Ag2Te-PbTe (R = Tb, Dy, Ho, Er), R2X3-Cu2X-In2X3 (X = S, Se; R= Y, La, Pr, Er) systems were constructed. The phase diagram of quasibinary Cu2Se - PbSe system was also constructed for the first time. The crystal structures of 460 (5 binary, 305 ternary and 150 quaternary) compounds were determined. Investigated compounds crystallize in 70 structure types. 36 structure types are created at the first time. The temperature dependences of electrical resistivity and magnetic supceptibility for some compounds were investigated. The systematization of ternary and quaternary compounds of the R-M-{Si, Ge, Sn, Pb, In}-{S, Se, Te} (R - rare earth metal, М - transition metal) systems, their relations to binary compounds and to the compounds of some related systems were done for the first time. The crystal structures of the most investigated compounds are derived to the closest packing of the atoms.