Crystal structures of the compounds R3CuSiS7 (R=Ce, Pr, Nd, Sm, Tb, Dy and Er) and R3CuSiSe7 (R=La, Ce, Pr, Nd, Sm, Gd, Tb and Dy)

• Published in: Journal of alloys and compounds Vol. 431; no. 1-2; pp. 185 - 190
• Main Authors: GULAY, L. D, LYCHMANYUK, O. S, OLEKSEYUK, I. D, DASZKIEWICZ, M, STEPIEN-DAMM, J, PIETRASZKO, A
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 04-04-2007
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Space groups; X-ray powder diffraction; X-ray single crystal diffraction; Se compounds; XRD; Rare earth compounds; Selenides; Silicon compounds; Chalcogenides; Sulfides; Copper compounds; Si compounds; Quaternary compounds; S compounds; Cu compounds; Crystal structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2006.05.090

The crystal structures of the compounds R3CuSiS7 (R=Ce, Pr, Nd, Sm, Tb, Dy and Er) and R3CuSiSe7 (R=La, Ce, Pr, Nd, Sm, Gd, Tb and Dy) (La3CuSiS7 structure type, space group P63, Pearson symbol hP24) were determined by means of X-ray single crystal and powder diffraction. The R atoms are surrounded by distorted trigonal prisms. A triangular surrounding exists for the Cu atoms. A tetrahedral surrounding exists for the Si atoms. The S(Se)1 and S(Se)3 atoms are surrounded by tetrahedra also. Four cations surround every S(Se)2 atom.