ChemInform Abstract: GALVANOMAGNETISCHE EIGENSCHAFTEN VON CUCR2TE4

Abstract

Beim Übergang von CuCr2Te4 aus dem ferro‐ in den paramagnetischen Zustand ändert sich der Charakter der Temperaturabhängigkeit der Thermo‐EMK, und die Temperaturabhängigkeit der elektrischen Leitfähigkeit zeigt eine leichte Anomalie.

Three-dimensional Ising Ferrimagnetism of Cr-Fe-Cr trimers in FeCr2Te4

“…1), confirming main phase of FeCr 2 Te 4 with less than 4% FeTe impurity. The determined lattice parameters at 300 K are a = 6.822(2) Å, b = 3.938(1) Å, c = 11.983(5) Å, and β = 90.00(5) • , close to the reported values [17,18]. No structural transition was observed on cooling, showing a compression along c axis with c = 11.867(5) Å and a slight expansion in the ab plane with a = 6.825(1) Å and b = 3.943(1) Å down to 105 K (Table I).…”

“…The magnetic moments of Cr ions are antiparallel to those of Fe ions in FeCr 2 X 4 , and there is strong hybridization between Fe 3d-states and X p-states [15]. FeCr 2 Te 4 has not been studied much presumably due to the difficulty in sample preparation [16][17][18]. Demeaux et al first grew the single crystals of FeCr 2 Te 4 [16].…”

“…The crystal structure was reported as a defective NiAs-type within P 6 3 /mmc space group, where Fe and Cr occupy the same site with alloying ratio of 1 : 2 and a net occupancy of 0.75 [16]. In contrast, Valiev et al reported that FeCr 2 Te 4 crystalizes in a CoMo 2 S 4 -type structure within I2/m space group, in which Fe and Cr are octahedrally coordinated by six Te [17]. Recently, a series of polycrystals FeCr 2 Se 4−x Te x were synthesized [18].…”

Thermoelectric, transport, and magnetic properties of the polaron semiconductorFexCr3−xSnyder1, Caillat2, Fleurial3 2000Phys. Rev. B551270View full textAdd to dashboardCite

“…3 Cr 3 Se 4 is a metal with a relatively large Seebeck coefficient, while FeCr 2 Se 4 is a semiconductor. 4 Furthermore, FeCr 2 Se 4 has been reported to have room-temperature thermal conductivity of 1.1 mW/cm K, which is an order of magnitude lower than the state-of-the-art thermoelectric material Bi 2 Te 3 . 5,6 Here we wish to evaluate the solubility limits of Cr and Fe in Fe x Cr 3Ϫx Se 4 , characterize their thermoelectric transport properties, and determine the optimal x for p-and n-type materials.…”