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

• Published in: Zeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 71; no. 5; pp. 553 - 566
• Main Authors: Radzieowski, Mathis, Benndorf, Christopher, Haverkamp, Sandra, Eckert, Hellmut, Janka, Oliver
• Format: Journal Article
• Language: English
• Published: 01-05-2016
• ISSN: 0932-0776; 1865-7117
• DOI: 10.1515/znb-2016-0044

The new equiatomic scandium transition metal aluminides Sc
T
Al 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, MgZn
2
type,
P
6
3
/
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,
P
6̅2
c
,
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
27
Al and
45
Sc magic angle spinning (MAS) and static NMR spectroscopic investigations.