Abstract
A semiempirical equation of state was derived for magnesite under the thermodynamic conditions of the Earth's mantle. Within experimental uncertainties, it is consistent with thermochemical, ultrasonic, X-ray, and shock-wave data at temperatures from 15 K to the melting point and pressures of up to 100-130 GPa. The fol- lowing values were recommended for the isothermal bulk modulus and its pressure derivative: K T = 111.71 GPa and K ' = 4.08. Thermodynamic analysis showed that magnesite does not decompose to periclase and CO 2 under the thermodynamic conditions of the Earth's lower mantle and outer core.
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