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• W4376504351 abstract "Phase transition, elastic, electronic, vibrational and thermal properties of LiBeA1−xSbx (A = P and As) are investigated via performing ab-initio calculations combined with the virtual crystal approximation (VCA) and the quasi-harmonic Debye model. Our total energy results show that LiBeAs1−xSbx and LiBeP1−xSbx undergo a phase transition from the Cu2Sb (P4/nmm) phase to the polar LiGaGe (P63mc) one beyond antimony concentration of x = 0.21 and 0.36, respectively. The calculated elastic constants show that the studied alloys are mechanically stable and they also exhibit abrupt discontinuities at the transition concentrations. From Poisson's ratio and the B/G ratio, both alloys are brittle. Our results indicate that the studied alloys are semiconductors and the gap value decreases as Sb concentration increases. The calculated phonon dispersion curves for different antimony concentrations have positive frequencies. The phonon frequencies at the zone centre for the Raman-active and infrared-active modes are predicted for the Cu2Sb and the LiGaGe structures for different antimony concentrations. The value of the polarisation is almost constant for different values of concentration. The variations of thermal expansion coefficient (α), bulk modulus (B), Debye temperature (ΘD), heat capacities at constant volume (Cv) and the Gru¨neisen parameter (γ) as a function of pressure and temperature were all obtained and analysed in detail." @default.
• W4376504351 created "2023-05-15" @default.
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• W4376504351 date "2023-05-13" @default.
• W4376504351 modified "2023-09-26" @default.
• W4376504351 title "Doping induced phase transition, elastic, electronic, vibrational and thermal properties of LiBeA_1-<i>x</i> Sb_<i>x</i> (A= P and As)" @default.
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• W4376504351 doi "https://doi.org/10.1080/14786435.2023.2209337" @default.
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