Validity of Using Lattice Statics at All Temperatures

It is shown that zero-point and thermal vibrations change the vacancy formation volume calculated from classical lattice statistics by usually no more than ${10}^{-3\mathrm{}}$ at all temperatures. In view of the recent interest in relating the temperature variation of the vacancy formation volume to Arrhenius plot curvature, the validity of lattice statics, as a tool for the calculation of temperature-dependent defect properties, is established.