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New Ternary La 2 Sb‐Type Compounds, Sc RE Sb ( RE = La, Ce, Pr, Nd, Sm, Tb), and the Oxygen Stuffed Variant Sc 4 Yb 4 Sb 4 O
Author(s) -
Nuss Jürgen,
Jansen Martin
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300666
Subject(s) - scandium , crystallography , crystal structure , terbium , tetragonal crystal system , lanthanide , dysprosium , chemistry , ternary operation , stoichiometry , materials science , inorganic chemistry , ion , organic chemistry , computer science , programming language
Scandium rare‐earth metal antimonides, Sc RE Sb ( RE = La, Ce, Pr, Nd, Sm, Tb) were synthesized from scandium metal and binary RE Sb at 1770 K in tantalum ampoules. According to X‐ray analyses of the crystal structures, they adopt the tetragonal ScCeSi‐type of structure (space group I 4/ mmm , Pearson code tI 12), a variant of La 2 Sb, with a fully ordered atom distribution. Especially in ScSmSb and ScTbSb, the scandium atoms are distorted from an ideal 4 4 net in a way to form Sc nets of squares and rhombi in order to adjust to the lattice shrinkage in the ab plane, caused by the lanthanide contraction. Finally the structure changes from La 2 Sb to Sc 2 Sb‐type ( anti ‐PbFCl‐type), when terbium is replaced by dysprosium. The respective compound with ytterbium was only found when stoichiometric amounts of oxygen were present, resulting in Sc 4 Yb 4 Sb 4 O, a La 2 Sb‐type variant stuffed with oxygen. A structure field map, based on specific geometric parameters, easily allows for distinguishing between oxygen stuffed and oxygen‐free compounds. Magnetic susceptibility measurements of ScCeSb, ScPrSb, and ScNdSb indicate Curie‐Weiss behavior with ferromagnetic exchange coupling underlying. The magnetic moments correspond to the expected values for RE 3+ .