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Keywords:

  • high pressures;
  • cationic radii;
  • equations of state;
  • compressed solids

The cationic radii of metals are derived from the compressibility of solids assuming that extreme compression of metals leads to direct contacts between cations (= atomic cores). In an extremely compressed binary compound the heteronuclear separations are equal to the sum of the cationic radius of the metal and the covalent radius of the nonmetal.