RPtSi phases (R = La, Ce, Pr, Nd, Sm and Gd) with an ordered ThSi₂ derivative structure

Abstract

The ternary equiatomic platinum silicides of the early rare-earth metals crystallize with a new structure type which was refined for LaPtSi: a = 4.2490 (3), c -14.539 (2) A, I41md , Z --4, D x = 9.16 Mg m -3, p(Mo Ka) = 72.34 mm-~; R --0.052 for 80 observed reflections. Isotypic RPtSi compounds are formed with R = Ce, Pr, Nd, Sm and Gd. The LaPtSi structure is a lattice-equivalent ternary derivative of the ThSi 2 structure type and has a maximal subgroup symmetry of the latter. AbstractThe structure of LiUO2AsO4.4D2 ° has been determined in space group P4/n with a = 7.0969 (1), c = 9.1903 (2)A and Z = 2 from a powder neutron 0567-7408/82/041108-05501.00 diffraction study at 294 K. 258 reflections were refined to an R factor on intensities of 3.8%. The water molecules are arranged in a two-dimensional array alternating with UO~ ÷ and AsO~-ions. The Li ÷ ions are tetrahedrally coordinated to the O atoms of the

Ordering phenomena in intermetallic CeMX (M=Ni, Cu and X=Si, Ge, Sn) upon hydrogenation

“…CeNiSi is known to crystallize in the tetragonal LaPtSi-type structure (S.G. I4 1 md) [7,8]. Our X-ray diffraction experiment confirm this structure with aZ4.070(2) Å and cZ14.030(5) Å .…”

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

“…Pm) [23]. These considerations were prompted after the elemental analysis on single crystals of several RAl x Si 2Àx phases showed virtually equal Al and Si content (see Section 2).…”

Superconducting properties of the ternary transition-metal silicide Zr2Ru3Si4

“…In this period, superconductors with various attractive features have been discovered, such as the first heavy fermion superconductor (CeCu 2 Si 2 [2]), multigap superconductors (Lu 2 Fe 3 Si 5 [3,4] and Sc 5 Ir 4 Si 10 [5,4]) and a noncentrosymmetric superconductor (LaPtSi [6,1,7,8]). Reflecting these successful results, the efforts for searching new superconductors in R x T y Si z still have been continued until now.…”