The boundary frequency of lowest optical branch displays a decreasing trend with the following order: As 2 C 3 (4.18 THz) > Sb 2 C 3 (3.08 THz) > Bi 2 C 3 (2.12 THz).
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Thermoelectric Properties of Hexagonal M₂C₃ (M = As, Sb, and Bi) Monolayers from First-Principles Calculations.
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