Solubility limit and annealing effects on the microstructure & thermoelectric properties of Fe2V1−xTaxAl

Thermoelectric properties and low-temperature transport anomalies in the p -type full-Heusler compounds Fe2−xCrxVAl

“…The measured data were then corrected for radiation loss by fitting the Callaway model [20] with an additional T 3 term, as has been successfully done in previous studies. [8,21,22] To acquire the lattice thermal conductivity the electronic portion was subtracted using the Wiedemann-Franz law with a Lorenz number of 2.44 × 10 −8 WΩ K −2 .…”

“…Moreover, a three-parabolic-band model, as has been employed successfully in similar compounds [8,10,12], was used to fit the Seebeck data (depicted as dashed lines in Figure 5). Obviously, experimental data above about 50 K are well accounted for by this model, revealing reasonable facts and figures regarding the respective valence and conduction bands (details are collected in the Supplemental Materials [23]).…”

“…[4,5] Pristine, ternary Fe 2 VAl consists of cheap and abundant elements, is easy to synthesize and has been extensively studied in recent years. [6][7][8][9][10][11][12][13] Both experimental data and density functional theory (DFT) based calculations show Fe 2 VAl as a semi-metal with a small negative indirect band gap, as can be seen in Figure 1. This results in a very low DOS (density of states) at the Fermi energy E F and a high sensitivity of the transport parameters to doping or elemental substitution.…”

First-principles study of Fe2VAl and Fe2VAl/Si thin films and their magnetic properties

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] In particular, thin films of these full-Heusler compounds have been investigated for potential room-temperature thermoelectric applications. [30][31][32][33][34][35][36] Experimental results 30,32) indicate the relationship between the thermoelectric and magnetic properties of these compounds. Bulk Fe 2 VAl has Fm 3m crystal symmetry (L2 1 structure) and metallic electronic states with a pseudo-gap around the Fermi level and is nonmagnetic.…”

Hard X‐Ray Photoemission Study of Heusler‐Type Fe2−xRexVAl Thermoelectric Compounds

“…Recently, there have been reports on the improvement in the thermoelectric properties of off-stoichiometric Fe 2 VAl compounds with the addition of doping elements. [40][41][42][43][44] Therefore, Fe 2 VAl compounds with a sharp pseudo-gap around E F have attracted attention as a new environmentally friendly thermoelectric material. However, there is a drawback in that the performance for the p-type is lower than that for the n-type in the case of fourth-element substitution.…”