Y3Au3Sb4 type structure La3Cu3Bi4: synthesis, structure and property

Abstract

The new intermetallic compound La3Cu3Bi4 was synthesized by arc melting method followed by annealing. The crystal structure refined using the Rietveld method and X-ray powder diffraction data showed to be Y3Au3Sb4 structure type with space group I43D (No.220). The unit cell parameters were a = 0.997 797(7) nm and V = 0.993 41(2) nm 3 . The structure was characterized by covalent Cu-Bi4 tetrahedron, which formed three-dimensional network by sharing corners and La atoms separated in the space of Cu-Bi4 tetragon. The expansion of La3Cu3Bi4 studied by using low temperature X-ray diffraction showed to be positive expansion and diminished with the temperature rising.

High potential thermoelectric figure of merit in ternary La3Cu3X4 (X = P, As, Sb and Bi) compounds

“…Previous experimental reports have established that La 3 Cu 3 Sb 4 and La 3 Cu 3 Bi 4 crystallize in the cubic structure, with the space group I - 43d 33,34 . However, the P and As analogs are not yet reported, despite the existence of compounds with other stoichiometries, such as La 5 Cu 19 P 12 35 , LaCu 4 P 3 36 , LaCu 1.09 P 2 36 , and LaCu 1.233 As 2 37 in these ternary groups.…”

Lattice thermal transport in La3Cu3X4 compounds (Pandey1, Polanco2, Lindsay3 et al. 2017Phys. Rev. B250220View full textAdd to dashboardCite

“…In this regard the rare earth based homologous compounds La 3 Cu 3 X 4 (X = P, As, Sb Bi) with large and complex unit cells (40 atoms) may be a promising class of materials for such applications. Among these La 3 Cu 3 Sb 4 and La 3 Cu 3 Bi 4 are experimentally known [6][7][8][9], and La 3 Cu 3 Sb 4 has been described as a degenerate p-type semiconductor with high electrical conductivity, moderate thermopower (∼150 µV/K), and of 2.5 W/m-K at room temperature [6][7][8][9]. La 3 Cu 3 P 4 and La 3 Cu 3 As 4 have not been realized experimentally, however, our recent work [10] in crystal structure prediction and thermodynamic stability analysis demonstrates that these are likely to be formed in the space group I-43d, same as La 3 Cu 3 Sb 4 and La 3 Cu 3 Bi 4 .…”