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Ternary Indides RE 4 Pd 10 In 21 ( RE = La, Ce, Pr, Nd, Sm) — Synthesis, Structure, and Physical Properties
Author(s) -
Zaremba Vasyl' I.,
Rodewald Ute Ch.,
Kalychak Yaroslav M.,
Galadzhun Yaroslav V.,
Kaczorowski Dariusz,
Hoffmann RolfDieter,
Pöttgen Rainer
Publication year - 2003
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.200390072
Subject(s) - diffractometer , ternary operation , crystallography , indium , crystal structure , materials science , chemistry , analytical chemistry (journal) , metallurgy , computer science , programming language , chromatography
The ternary indium compounds RE 4 Pd 10 In 21 ( RE = La, Ce, Pr, Nd, Sm) were synthesized from the elements in glassy carbon crucibles in a high‐frequency furnace. Single crystals of Sm 4 Pd 10 In 21 were obtained from an indium flux. An arc‐melted precursor alloy of the starting composition ∼SmPd 3 In 6 was annealed with a slight excess of indium at 1200 K followed by slow cooling (5 K/h) to 870 K. All compounds were investigated by X‐ray powder diffraction and the structures were refined from single crystal diffractometer data. The RE 4 Pd 10 In 21 indides are isotypic with Ho 4 Ni 10 Ga 21 , space group C 2/ m : a = 2314.3(2), b = 454.70(7), c = 1940.7(2) pm, β = 133.43(2)°, wR2 = 0.0681, 1678 F 2 values for La 4 Pd 10 In 21 , a = 2308.2(1), b = 452.52(4), c = 1944.80(9) pm, β = 133.40(1)°, wR2 = 0.0659, 1684 F 2 values for Ce 4 Pd 10 In 21 , a = 2303.8(2), b = 450.78(4), c = 1940.6(1) pm, β = 133.39(1)°, wR2 = 0.0513, 1648 F 2 values for Pr 4 Pd 10 In 21 , a = 2300.2(2), b = 449.75(6), c = 1937.8(2) pm, β = 133.32(1)°, wR2 = 0.1086, 1506 F 2 values for Nd 4 Pd 10 In 21 , and a = 2295.6(2), b = 447.07(4), c = 1935.7(1) pm, β = 133.16(1)°, wR2 = 0.2291, 2350 F 2 values for Sm 4 Pd 10 In 21 , with 108 variables per refinement. All palladium atoms have a trigonal prismatic coordination. The strongest bonding interactions occur for the Pd—In and In—In contacts. The structures are composed of covalently bonded three‐dimensional [Pd 10 In 21 ] networks in which the rare earth metal atoms fill distorted pentagonal channels. The crystal chemistry and chemical bonding in these indides is briefly discussed. Magnetic susceptibility measurements show diamagnetism for La 4 Pd 10 In 21 and Curie‐Weiss paramagnetism for Ce 4 Pd 10 In 21 , Pr 4 Pd 10 In 21 , and Nd 4 Pd 10 In 21 . The neodymium compound orders antiferromagnetically at T N = 4.5(2) K and undergoes a metamagnetic transition at a critical field of 1.5(2) T. All the RE 4 Pd 10 In 21 indides studied are metallic conductors.