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• W3046434828 abstract "Abstract To meet energy demand, half-Heuslers (HH) are proved to be a cost-effective and energy-efficient choice for advanced spintronic and energy storage applications. The structural, electronic, magnetic, vibrational, elastic, thermodynamic and thermoelectric properties of the innovative HH CrVZ (where Z = S, Se, & Te) alloys are studied by using density functional theory (DFT). All materials are found to be magnetically active with 100% spin polarization where partially filled 3d-orbitals of Cr confirm the major contribution to the magnetic moment. The ferromagnetic (FM) state is observed to be the most energetically stable state among the non-magnetic (NM) and antiferromagnetic (AFM) states for all the HH CrVZ alloys with their optimized lattice parameters ranging from 5.47 A to 6.00 A. The HH CrVSe alloy is found to have the lowest direct bandgap ( E B G ) of 1.07 eV with a comparatively highest half-metallic gap ( E H M ) of 0.44 eV, due to the d-d hybridization. Our calculated cohesive ( E C ) and formation ( E f ) energies indicate the chemical and thermodynamic stability of the studied HH CrVZ alloys. The phonon dispersion curves for the HH CrVSe and CrVTe alloys show that they are vibrationally stable while HH CrVS alloy shows soft modes with imaginary frequency due to the small ionic size of the S-ion. The calculated Cauchy pressure, Pugh and Poisson ratio prove that all studied compounds are hard, elastically brittle, anisotropic, and mechanically stable. The temperature fluctuations for specific heat (CV), Entropy (S) and Free Energy (F) follows the Quasi-harmonic Debye model with expected Dulong-petit limit 75 J/mol/K. The thermoelectric investigations although show the lower values of the Seebeck coefficient and power factor. Our investigated half-metallic HH CrVZ alloys can be the potential contenders for the spintronic applications." @default.
• W3046434828 created "2020-08-07" @default.
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• W3046434828 date "2020-12-01" @default.
• W3046434828 modified "2023-10-03" @default.
• W3046434828 title "Structural and mechanical stability, lattice dynamics and electronic structure of the novel CrVZ (Z = S, Se, & Te) half-Heusler alloys" @default.
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• W3046434828 doi "https://doi.org/10.1016/j.mtcomm.2020.101519" @default.
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