Ternary Antimonides YbTSb (T = Ni, Pd, Pt, Cu, Ag, Au) – Synthesis, Structure, Homogeneity Ranges, and ¹²¹Sb Mössbauer Spectroscopy

Abstract

The ternary antimonides YbTSb (T = Ni, Pd, Pt, Cu, Ag, Au) were synthesized by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. The structures of YbCuSb (NdPtSb type), YbAgSb (TiNiSi type), and YbAuSb (NdPtSb type) were confirmed on the basis of X-ray powder diffraction data. Those of the nickel, palladium, and platinum based antimonides (cubic MgAgAs type) were refined from single crystal X-ray data. The nickel based antimonide has a pronounced homogeneity range YbNixSb. The structures of five crystals have been investigated. The cubic lattice parameter increases with increasing nickel content from 613.13(6) pm(x = 0.17) to 621.25(5) pm (x = 0.63). Full occupancy of the palladium and antimony sites was observed for YbPdSb while the platinum compound shows some platinum vacancies leading to the composition YbPt0.969(7)Sb for the investigated crystal. A new, hightemperature modification of YbPdSb was obtained by rapidly quenching an arc-melted sample: TiNiSi type, Pnma, a = 725.6(2), b = 458.3(1), c = 785.4(2) pm, wR2 = 0.1255, 421 F2 values, 20 variables. The antimonides YbTSb (T = Ni, Pd, Pt, Cu, Ag, Au) show single 121Sb Mössbauer signals at isomer shifts ranging from -7.34 to -7.82 mm/s. The crystal chemistry and chemical bonding of these antimonides is discussed.

Solid Solutions RE16Rh11–xZx (RE = La, Ce, Pr, Nd, Sm; Z = Ga, Zn, Cd, In, Sn, Sb, Pb, Bi) – Centrosymmetric n = 2 Variants of Parthé’s Homologous Series A5n+6B3n+5

“…Although the structure refinement also showed two Wyckoff sites with Rh/Sb mixing, only the superimposed signal of both spectral contributions could be observed. The isomer shift of − 8.22 mm s −1 points to an antimonide character [38], similar to the series YbT Sb [39] and REZnSbO [40].…”

Cerium intermetallics with TiNiSi-type structure

“…This is the typical range for intermetallic antimonides [234,235]. Again, the hydrogenation does not primarily affect the electronic situation of the X atoms, similar to the stannides.…”

Ternary CaCu4P2-type pnictides AAg4Pn2 (A=Sr, Eu; Pn=As, Sb)

“…Previously known phases have been limited only to the equiatomic compounds AAgAs and AAgSb (A¼Mg, Ca, Sr, Ba, Eu, Yb) that are mostly based on ordered derivatives of the AlB 2 -type structure [14][15][16][17][18][19][20][21][22][23][24][25]. Here we report the preparation of four new compounds AAg 4 Pn 2 (A¼Sr, Eu; Pn ¼As, Sb), demonstrating that the CaCu 4 P 2 -type structure [26] that they adopt can also be regarded as a stuffed isoelectronic variant of the CaAl 2 Si 2 -type compounds AZn 2 Pn 2 (A¼Sr, Eu; Pn ¼As, Sb).…”