Synthesis and thermoelectric properties of Re3As6.6In0.4 with Ir3Ge7 crystal structure.
The Re3As7- x In x solid solution was prepared for x ≤ 0.5 by heating the elements in stoichiometric ratios in evacuated silica tubes at 1073 K. It crystallizes with the Ir3Ge7 crystal structure, space group Im-3m, with a unit-cell parameter a ranging from 8.716 to 8.747 Å. The crystal structure and properties were investigated for a composition with x = 0.4. It is shown that indium substitutes arsenic exclusively at one crystallographic site, such that the As-As dumbbells with d As-As = 2.54 Å remain intact. Re3As6.6In0.4 behaves as a bad metal or heavily doped semiconductor, with electrons being the dominant charge carriers. It possesses high values of Seebeck coefficient and low thermal conductivity, but relatively low electrical conductivity, which leads to rather low values of the thermoelectric figure of merit.
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
Valeriy Y
VY
Verchenko
Anton S
AS
Vasiliev
Alexander A
AA
Tsirlin
Vladimir A
VA
Kulbachinskii
Vladimir G
VG
Kytin
Andrei V
AV
Shevelkov
Ir3Ge7 type; band-structure calculations; energy conversion; solid solution; thermoelectric material