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An investigation on the structure stability and elastic properties of Si4Ge4 under high pressure was conducted using first-principles calculations.All calculations were performed using the plane-wave pseudopotential DFT method as implemented in the CASTEP 7.0 simulation package,using norm-conserving pseudopotentials within the local density approximation(LDA)as parameterized by Perdew and Zunger.The convergence criteria for structure optimization and energy calculation were set to ultrafine quality with a kinetic energy cutoff of 390 eV and Monkhorst k-point meshes of 4×4×7.