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The Hall coefficient and resistivity of the solid solutions Cd3−xZnxAs2, formed by the pseudobinary system Cd3As2‐Zn3As2, are measured between 100 and 700 °K. The samples are found to be semiconducting, being n‐type for 0 ≦ x ≦ 1.35, and p‐type for 1.5 ≦ x ≦ 3. The transition from n‐to p‐type takes place at about 47 mole % Zn3As2 with a transition region of 2–3 mole% Zn3As2, an abrupt change in ΔE0 being observed in this transition region. These results show a close correlation with the X‐ray analysis of the system.

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