Equation of state for group IV-IV semiconductors

We present the ab initio pseudopotential formalism for generating the equation of state (EOS) for group IV-IV semiconductors from first-principles calculations. The expression for the EOS is derived within the pseudopotential framework. The computed isothermal compression curves for group IV-IV semiconductors down to high compressions V/Vo=0.55, where Vo is the volume V at pressure P=0, are compared with compression curves from other EOSs belonging to different classes and categories. The present EOS has also been tested for the prediction of end-point.