Abstract

It was shown recently that transition-metal (TM) compounds with the TM component from the second long period show higher Tc than the analogous compounds having TM components from the first and third periods. The rule is held provided the TM components have four to seven outer electrons. In the present paper it is shown that the same rule can be applied to compounds with TM components having three outer electrons, but cannot be applied to compounds with TM components having eight and nine outer electrons.

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