Crystal structures of the RAlSi and RAlGe compounds

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

“…Several comprehensive studies have dealt with the phase equilibria in certain isothermal sections of the RAl-Si phase diagrams [1,2,[6][7][8][9]. Tremendous efforts have been made to identify and structurally characterize all structure types in which the binary R-Si, R-Al, and the corresponding R-Al-Si phases crystallize.…”

“…Effects such as ternary solid solubility and the existence of low and high-temperature modifications complicate the structural analysis even further. Some classifications and systematic studies of equiatomic RAlSi [8] and RAlGe [8,12,32] have already been published. These structural data on ''on-stoichiometry'' prepared compounds establish that when R is a small rare-earth (Tb-Lu), the corresponding RAlSi and RAlGe compounds crystallize with the orthorhombic YAlGe-type [8,12].…”

“…Recently, several publications on the phase equlibria and properties in the systems R-Al-Si (R ¼ rare-earth metal) appeared [6][7][8][9]. Possible homogeneity ranges and associated structure-property relationships in the systems Ce-Al-Si and Ce-Al-Ge have been discussed [6].…”

New structure of the ternary compound DyAlSi

“…It was reported that the ternary compound DyAlSi has an orthorhombic, YAlGe type structure, space group Cmcm (No. 63) at 873 K [4]. However, in our recent research, a new crystal structure of the high-temperature phase of DyAlSi was discovered.…”

“…Among them there are 6 alumosilicides (RE = La-Nd, Eu and Gd) and 16 alumogermanides (RE = Sc, Y, La-Lu). Pukas et al [4] also investigated the crystal structures of equiatomic REAlX (X = Si, Ge) compounds. Based on the various independent investigations concerning the equiatomic alumosilicides and alumogermanides, most of the equiatomic REAlSi compounds can be divided into two groups.…”