The gadolinium-cadmium system

Novel intermetallics with the Ca11 Ga7 structure type

“…For the tetrels, a suitable reference are the Zintl compounds A 2 M IV crystallizing with the anti-PbCl 2 structure type [20]; for the triels Ca 8 Al 3 [31], Ca 28 Ga 11 [8], Ca 2 In (Co 2 Si-type [7]) and Sr 28 In 11 [7] can be used for the comparison. In all these compounds, the coordination number of M is usually nine (and always between 8 and 10), and thus in agreement with the coordination number observed for M (2) in the title compounds. The same holds for the distances A-M(2), in the cases of a pure occupation of the site M(2) with Ga, In Table 7 Selected interatomic distances (pm) in the crystal structures of the triel/tetrelides forming the Ca 11 Ga 7 structure type (maximum standard deviation: 0.…”

“…Most of these compounds have been characterized in 1980s [1,2], but the structures of some indides (although known for a long time [3,4]) have been solved only recently [5][6][7]. While most of the Ga/In-rich compounds with higher valence electron concentrations (v.e.c.)…”

Intermetallic compounds in the M–Cu–Sn systems with M=Eu, Sr, Ba

“…The MeX bonds complete the coordination of all X atoms. In order to evaluate the bond strength [25], the table reports also the values of the ratio d/ P r between the bond length value and the corresponding sum of the metallic radii. In this discussion, as common basis, the metallic radii for CN12 after Teatum, Gschneidner and Waber [26] will be used to calculate bond contractions and radii ratios.…”

Ternary phases in the Yb–Zn–Al system with La3Al11- and Yb8Cu17Al49-type structures

“…These observations are confirmed by data available in the literature. Considering for instance Tb 3 Zn 4.6 Al 6.4 [3] and Tb 3 Zn 3.6 Al 7.4 [17], compared with the binary Tb 3 Zn 11 compound [14], the same anomalies in both lattice parameters and X2eX2 distances are found, on increasing the Al content.…”

“…The trend is even more evident considering the binary phase Yb 3 Zn 11 [11,14] with the same structure (see Table 1); in Yb 3 Zn 4.84 Al 6.16 , where more than half zinc is replaced by the larger aluminium, the a and c parameters are 4% and 5% smaller than in the binary phase, respectively. It is known that the orthorhombic La 3 Al 11 structure is derived from the tetragonal BaAl 4 -type by taking three BaAl 4 cells aligned along the [100] direction, removing two Al atoms and displacing somewhat the others.…”