Direct parameterization of the pressure-dependent volume by using an inverted approximate Vinet equation of state

Among the different kinds of equation of state (EoS), the Vinet EoS is believed to be one of the most accurate, providing correct results for different material systems up to very high compression ratios. In order to invert the Vinet EoS analytically, a Taylor series expansion truncated to third order can be used, which allows a direct application in parametric refinement of powder diffraction data.