Hf3Ga1.97(2)Sn1.03(2), a ternary derivative of the ThIn type

Abstract

The crystal structure of the substitutional solid solution HfGa 1-x Sn x (x = 0-0.34(1)) was refined from X-ray single-crystal and powder diffraction data (space group Pbcm, Pearson symbol oP24, a = 9.3370(19), b = 8.6920(17), c = 5.6650(11) Å for Hf 3 Ga 1.97(2) Sn 1.03(2)). The structure of the ideal limiting formula Hf 3 Ga 2 Sn, ignoring partial Ga/Sn disorder, represents the first ternary ordering derivative of the structure type ThIn. The structure of Hf 3 Ga 2 Sn is closely related to that of Hf 5 GaSn 3 (limiting composition of the interstitial solid solution Hf 5 Ga x Sn 3 (x = 0-1), structure type Hf 5 CuSn 3 , space group P6 3 /mcm) and can be derived from it applying group-subgroup relations between the space groups.

The ternary system Hf–Ga–Si at 600ºC

“…The Hf-rich region of the phase diagram of the ternary system Hf-Ga-Si at 600ºC is characterized by the existence of continuous solid solutions between isostructural binary compounds of the Hf-Ga and Hf-Si systems. The formation of similar continuous solid solutions has been reported for related systems: Zr 2 Al 1-x Si x (x = 0-1) with CuAl 2 -type structure in the Zr-Al-Si system at 1200ºC [2] and Hf 5 Ga 3-x Ge x (x = 0-3) with Mn 5 Si 3 -type structure in the Hf-Ga-Ge system at 600ºC [28]. Obviously, the small difference Fig.…”

The system Hf–Ga–Sn at 600ºC and the crystal structure of Hf5Ga1.24-0.52Sn1.76-2.48

“…The isothermal section of the phase diagram of the ternary system Hf-Ga-Sn at 600ºC is shown in Fig. 1 [26]. The obtained composition of the single crystal from X-ray spectral analysis agrees well with the nominal composition of the synthesized alloy (Table 4).…”

“…The structure of Hf 3 Ga 2 Sn (limiting composition of the substitutional solid solution HfGa 1-x Sn x (x = 0-0.34)), being an ordered derivative of the ThIn structure type, is closely related to the structure of Hf 5 GaSn 3 (limiting composition of the interstitial solid solution Hf 5 Ga x Sn 3 (x = 0-1), structure type Hf 5 CuSn 3 ). Both structures can be conveniently described as being built from similar layers [26].…”

The ternary system Hf–Ga–Sb at 600ºC

“…The structure of the ternary compound Hf 5 GaSb 3 was determined from X-ray powder diffraction data collected on a diffractometer STOE Stadi P. It crystallizes with the structure type Hf 5 CuSn 3 (Pearson symbol hP18, space group P6 3 /mcm, a = 8.4747 (5), c = 5.7190(5) Å). As stated above, this type represents a ternary ordered variant of the Ti 5 Ga 4 structure type, which is a filled derivative of the Mn 5 Si 3 -type structure.…”

“…Short time ago the isothermal section at 600ºC of the phase diagram of the ternary system Hf-Ga-Sn was constructed in the whole concentration range, and the crystal structures of the ternary phases formed in it, were reported [4][5][6]. Solid solutions with up to 17 at.% Sn based on the binary gallides HfGa (structure type ThIn, Pearson symbol oP24, space group Pbcm) and Hf 5 Ga 3 (structure type Mn 5 Si 3 ) were observed.…”