Ternary rare-earth alumo-silicides—single-crystal growth from Al flux, structural and physical properties

Equiatomic cerium intermetallics CeXX′ with twopelements

“…The three elements were reacted in alumina crucibles under an eutectic KCl-LiCl flux as protective coating [16]. An aluminium flux was used for the CeAl x Si 2-x samples [17]. The excess aluminum was removed by centrifugation at 970 K.…”

Synthesis, flux crystal growth, structure and properties of the new rare-earth compounds EuAl4−xSix (x∼1), TmAlSi and LuAlSi

“…In contrast, when RE is an early rare-earth (La-Gd), the tetragonal ␣-ThSi 2 -type is realized. Our own studies [1], carried out with fixed RE:Si ratios (1:2) and using an excess of Al as a flux, show similar trends-the first half of the rare-earth metals invariably yield REAl x Si 2−x with the ␣-ThSi 2 structure, whereas the remaining rare-earths favor the formation of RE 2 Al 3 Si 2 with the Y 2 Al 3 Si 2 structure. Eu and Yb, due to their tendency to be divalent, a result of the stabilization half-filled and completely filled f-shells for Eu 2+ and Yb 2+ , respectively, yield EuAl 2 Si 2 and YbAl 2 Si 2 with the trigonal CaAl 2 Si 2 -type [4].…”

“…A number of ternary rare-earth alumo-silicides (RE-Al-Si) have recently been synthesized from pure elements by high temperature reactions, carried out in aluminum flux [1]. Under these experimental conditions, large single crystals of three general structure types can be easily grown: (1) REAl x Si 2−x , 0.8 < x < 1.2, non-stoichiometric ternary derivatives of the bodycentered tetragonal ␣-ThSi 2 -type [2], formed by the early rareearths (RE = La, Ce, Pr, Nd, Sm and Gd); (2) stoichiometric RE 2 Al 3 Si 2 compounds, formed when RE = Tb, Dy, Ho, Er and Tm, i.e.…”

Phase relationships of the R–Al–Si systems

“…The substitution with aluminium for silicon in the s 5 compound was suggested by Bobev et al [17], but at 500°C also the substitution with silicon for aluminium occurs. The compound exists in a range from 28 to 38 at.% aluminium.…”

“…In this system, the following phases are known: PrAl 2 Si 2 (hP5-CaAl 2 Si 2 type) [15], Pr 3 Al 4 Si 6 (hP13-Ce 3 Al 4 Si 6 type) [15], PrAlSi 2 (hP8-CeaAlSi 2 type) [16] Pr 2 Al 3 Si (hP3-AlB 2 type) [15], PrAl (1-x) Si (1?x) (tI12-aThSi 2 type) [17], Pr 2 AlSi (tI12-aThSi 2 type) [18].…”