Crystal structures of the new intermetallics Ce3Pt5Al and Ce3Pt5Al2

Abstract

The crystal structures of the ternary intermetallics Ce 3 Pt 5 Al and Ce 3 Pt 5 Al 2 have been determined from single crystal X-ray diffraction data. Ce 3 Pt 5 Al is a new representative of the Ce 3 Pd 5 Si-type of structure: space group Imma, a = 7.3767(4) Å, b = 13.1733(8) Å, c = 7.5884(4) Å, Pearson symbol oI36. Ce 3 Pt 5 Al 2 crystallizes in the triclinic space group P-1 with a = 5.689(2) Å, b = 8.432(3) Å, c = 8.7103(13) Å, α = 102.31(2)º, β = 97.89(2)º, γ = 89.10(3)º (Pearson symbol aP20) and represents a novel structure type. In both structures, the coordination polyhedra are rather irregular. The structures of Ce 3 Pt 5 Al and Ce 3 Pt 5 Al 2 can be represented as packings of Ce-centered polyhedra. Cerium platinum aluminide / X-ray diffraction / Crystal structure

Platinum Triangles in the Pt/Al Framework of the Intermetallic REPt6Al3 (RE = Ce–Nd, Sm, Gd, Tb) Series

“…Since only two sites for Pt and Al exist, the 1‐4‐1 composition always exhibits a mixed occupation of Pt and Al on the 3 g site. The compounds Ce 3 Pt 5 Al (Ce 3 Pd 5 Si type), Ce 3 Pt 5 Al 2 (own structure type), CePt 3.43 Al 1.57 (own structure type), and the solid solution RE Pt 2.4 Al 0.6 ( RE = La, Ce; CeNi 3 type) have been reported recently. Another Pt‐rich composition, only known for cerium is CePt 3 Al , .…”

Electronic and structural properties of Y6Pt13X4, site occupancy variants of the Ba6Na16N subnitride (X = Al, Ga)

“…Structural characterizations have been carried out for Ce 3 Pt 5 Al 2 (own structure type) and Ce 3 Pt 5 Al (Ce 3 Pd 5 Si-type) employing single crystal X-ray diffraction. 34 Compounds REPt 2.4 Al 0.6 (RE = Ce, La) have been found to crystallize in the CeNi 3 -type structure from powder X-ray diffraction data; the cerium ions in CePt 2.4 Al 0.6 are in the usual trivalent state and the compound orders ferromagnetically near 1.6 K as inferred from low temperature heat capacity, magnetization and electrical resistivity data. 35 According to Vejpravová et al (2006), 36 CePt 3 Al forms a distorted CePt 3 B-type structure; 37 the compound exhibits magnetic ordering at T = 1.9 K. The REPt 6 Al 3 series (space group R 3̄ c , RE = Ce–Nd, Sm, Gd, Tb) 38 has been observed to exist for both large and small lanthanoids; the ground state in the cerium compound has been characterized as a heavy fermion from magnetic, transport, and specific-heat measurements of a single-phase crystalline sample.…”

“…Structural characterizations have been carried out for Ce 3 Pt 5 Al 2 (own structure type) and Ce 3 Pt 5 Al (Ce 3 Pd 5 Si-type) employing single crystal X-ray diffraction. 34 Compounds REPt 2.4 Al 0.6 (RE = Ce, La) have been found to crystallize in the CeNi 3 -type structure from powder X-ray diffraction data; the cerium ions in CePt 2. 4 Al 0.6 are in the usual trivalent state and the compound orders ferromagnetically near 1.6 K as inferred from low temperature heat capacity, magnetization and electrical resistivity data.…”