Formula for the Melting Points of Inorganic Compounds of Type MXOn

概要

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(1)An expression for the melting points of the inorganic compounds of type MXOn has been obtained as, T·(α_+-α_-)^1/6=a-b·(r_-/r_+), and the values of a and b have been given, where T is the melting point in absolute temperature, α+ and r+ are the polarizability and the ionic radius of the cation M+, res-pectively, and α－, r－ are the polarizability and the ionic radius of the ion X(2n－1)+ respectively. (2) Considering the results of the practical calculation, the values given by Goldschmidt are to be adopted for the formula as the polar -izabilities and ionic radii, and those given by Fajans and by Pauling are less satisfying in some cases. It is probably due to the fact that the Gold Schmidt's values correspond to the ions in the solid and those of Pajans and of Pauling to the free ions. (3) This formula will be useful for the ex-amination of the known values of the melting points and for the estimation of the unknown data. (4) It is very important that 'melting point' is presented as a function of the variables characteristic for atoms, such as ionic radius and polarizability of atoms.
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