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Anion clustering according to a rule discovered by E Zintl may occur in ionic alloys. The chemical bonds between the anions are predominantly covalent. The drastic consequences of this effect for the electronic and structural properties of liquid ionic alloys are demonstrated for alloys of alkali metals with Pb, Sn, Bi, Tl and In.
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W. van der Lugt (1991) studied this question.
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