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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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The refractive index and absorption coefficient of thin evaporated Cd,Asa films are determinded from spectrophotometric transmission and reflection measurements over the range 0.5 to 12 vm. The refractive index of Cd,Aa, is 4.6 at L = 12 pm; at A = 1.9 pm a maximum index of nmax = 5.3 is observed. I n the spectral region 0.5 to 2 pm a sharp decrease is observed in the absorption coefficient, of about two orders of magnitude, from lo5 cm-l to los cm-1, which may be due to direct transitions. In the range 6 to 12 pm, the

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