Citation

Heying B, Pöttgen R, Valldor M, Rodewald UC, Mishra R, Hoffmann RD. Monatsh. Chem. 2004; 135(11): 1335-1347.

Copyright

(Copyright © 2004, Holtzbrinck Springer Nature Publishing Group)

DOI

10.1007/s00706-004-0209-3

PMID

unavailable

Abstract

The equiatomic rare earth metal-iridium-silicides REIrSi (RE = Ce, Pr, Er, Tm, Lu) were prepared by arc-melting of the elements and subsequent annealing. All suicides were characterized through their X-ray powder patterns. The structures of CeIrSi, ErIrSi, and LuIrSi were refined from X-ray single crystal diffractometer data: LaIrSi type, P213, a = 629.15(2) pm, wR2 = 0.1232, 280 F2 values, and 11 variable parameters for CeIrSi; TiNiSi type, Pnma, a = 673.4(1), b = 416.07(5), c = 744.88(9) pm, wR2 = 0.0705, 339 F2 values, and 20 variable parameters for ErIrSi, and a = 664.0(3), b = 412.9(1), c = 742.6(1)pm, wR2 = 0.0398, 496F2 values, and 20 variable parameters for LuIrSi. The iridium and silicon atoms in CeIrSi, ErIrSi, and LuIrSi build three-dimensional [IrSi] networks where the iridium atoms have three (CeIrSi, Ir-Si 229pm) and four (ErIrSi, Ir-Si 247-258 pm; LuIrSi, Ir-Si 245-256 pm) silicon neighbors. The [IrSi] networks leave larger channels in which the cerium, erbium, and lutetium atoms are located. Temperature dependent susceptibility data for LuIrSi indicate Pauli paramagnetism. CeIrSi shows Curie-Weiss paramagnetism above 100 K with an experimental magnetic moment of 2.56(2) μB/Ce atom. With samarium as rare earth metal component the suicide SmIr0.266(8)Si1.734(8) with α-ThSi 2 type structure was obtained: I41/amd, a = 409.3(1), c = 1397.2(5) pm, wR2 = 0.0575, 161 F2 values, and 9 variable parameters. Within the three-dimensional [Ir0.266Si1.734] network the Ir/Si-Ir/Si distances range from 230 to 237 pm. © Springer-Verlag 2004.

Language: en

Keywords

article; synthesis; chemical analysis; Crystal chemistry; Rare earth compounds; X ray powder diffraction; atom; cerium; chemical structure; diffraction; element; erbium; iridium; lanthanide; lutetium; magnetism; Magnetochemistry; praseodymium; samarium; silicon derivative; temperature dependence; terbium; x ray single crystal diffractometer