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The bulk modulus of alkali metals (calculated by the density functional method) is decomposed into a part due to the electronic gas, assumed homogeneous, and another part arising from the inhomogeneity of the electron density. The relative contributions of the two terms is studied as a function of volume and as a function of the ionic radius. The theoretical results for the bulk modulus and its variation with volume show very good agreement with the experiments.
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López et al. (1981) studied this question.
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