On new ternary equiatomic scandium transition metal aluminum compounds ScTAl with T = Cr, Ru, Ag, Re, Pt, and Au

Author:

Radzieowski Mathis1,Benndorf Christopher,Haverkamp Sandra2,Eckert Hellmut,Janka Oliver1

Affiliation:

1. Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 28–30, 48149 Münster, Germany

2. Institut für Physikalische Chemie , Universität Münster , Corrensstrasse 28–30, 48149 Münster, Germany

Abstract

Abstract The new equiatomic scandium transition metal aluminides ScTAl for T = Cr, Ru, Ag, Re, Pt, and Au were obtained by arc-melting of the elements followed by subsequent annealing for crystal growth. The samples were studied by powder and single crystal X-ray diffraction. The structures of three compounds were refined from single crystal X-ray diffractometer data: ScCrAl, MgZn2 type, P63/mmc, a = 525.77(3), c = 858.68(5) pm, R 1 = 0.0188, wR 2 = 0.0485, 204 F 2 values, 13 variables, ScPtAl, TiNiSi type, Pnma, a = 642.83(4), b = 428.96(2), c = 754.54(5) pm, R 1 = 0.0326, wR 2 = 0.0458, 448 F 2 values, 20 variables and ScAuAl, HfRhSn type, P6̅2c, a = 722.88(4), c = 724.15(4) pm, R 1 = 0.0316, wR 2 = 0.0653, 512 F 2 values, 18 variables. Phase pure samples of all compounds were furthermore investigated by magnetic susceptibility measurements, and Pauli-paramagnetism but no superconductivity was observed down to 2.1 K for all of them. The local structural features and disordering phenomena have been characterized by 27Al and 45Sc magic angle spinning (MAS) and static NMR spectroscopic investigations.

Publisher

Walter de Gruyter GmbH

Subject

General Chemistry

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