X-ray structure determination of pseudomerohedrally twinned CoGe_1.5S_1.5 and CoGe_1.5Se_1.5, absorption correction

Abstract

The crystal structures of the mixed skutterudites CoGe

Thermoelectric Properties of Co4Sn6Se6 Ternary Skutterudites

“…1), our undoped sample Co 4 Sn 6 Se 6, was unlike the similar mixed-anion skutterudites (Co 4 Ge 6 Te 6 , 10 CoGe 1.5 Se 1.5 , 9 and Co 4 Sn 6 Te 6 6 ), at room temperature, of p-type (2) electrical conductivity. The Seebeck coefficient reached a maximum at approximately 600 K and then decreased quite steeply.…”

Synthesis, crystal structure and transport properties of skutterudite-related CoSn1.5Se1.5

“…The crystal structure of title phase is isostructural with CoSn 1.5 Te 1.5 [14], IrSn 1.5 Te 1.5 [15] and CoGe 1.5 Te 1.5 [9]. As suggested by Vaqueiro et al [9] and Partik et al [10], crystal structures of these phases can be derived from cubic skutterudite structure MX 3 (M = Co, Rh, Ir; X = P, As, or Sb), where Sn (Ge) and Se (Te) atoms shows long-range ordering in planes perpendicular [1 1 1] direction of the original cubic cell. As a consequence, the symmetry is lowered from cubic to trigonal.…”

“…[8,9]. The crystallographic studies of performed on CoGe 1.5 S 1.5 , CoGe 1.5 Se 1.5 [10] and CoGe 1.5 Te 1.5 [9] revealed a long-range ordering of Ge and Ch atoms resulting in lowering of the symmetry from cubic to rhombohedral. The existence and some properties of CoSn 1.5 Se 1.5 phase were reported in [11] as a part of review of skutterudite materials, however no detailed information concerning crystal structure and thermoelectric properties is available.…”

Crystal structure determination of CoGeTe from powder diffraction data

“…With regard to ternary cobalt bearing germanide chalcogenides (Ch = S, Se and Te), the examples encountered so far are CoGe 1.5 S 1.5 , CoGe 1.5 Se 1.5 [1,2] and CoGe 1.5 Te 1.5 [3]. The crystal structures of these compounds can be viewed as a modification of skutterudite structure MX 3 (M = Co, Rh or Ir; X = P, As or Sb), where Ge and Ch atoms exhibit long-range ordering, which results in a lowering of the symmetry from original cubic to rhombohedral [2]. These phases are of interest in materials science because of their possible thermoelectric applications.…”