Abstract
Natural Zn-tennantite Cu10.10Ag0.04(Zn1.29-Fe0.67)1.96(As3.04Sb0.89)3.93S12.98 from Beresovskoe, Urals, behaves as an ordinary semiconductor in the temperature range 300–400 K and frequency range 108–2.8·1010 Hz, and no ionic component conductivity is observed. This contrasts with the behaviour of synthetic tetrahedrites (both Cu-rich and Cu-poor) which are solid electrolytes. These results can be related to the number of vacancies per formula unit and the substitution scheme for the divalent metals in fahlore.
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