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In extended pressure and temperature ranges,a theoretical study of the isothermal bulk modulus of SiC in B3 structure under high pressure and temperature is carried out by means of first-principles density functional theoretical calculations combined with the quasi-harmonic Debye model.Through the quasi-harmonic Debye model,the isothermal bulk modulus and its first and second pressure derivatives are successfully obtained.The thermodynamics properties of 3C-SiC are investigated in the pressure range of 0-100 GPa and the temperature range of 0-2000 K.