Abstract
Electrical measurements on dicobalt decamine‐μ‐peroxy complex (Vortmann's salt) are described. The current formulation contained CoIII and CoIV in crystallographically equivalent positions and hence it was thought that the complex might be an intrinsic semiconductor. An apparent dielectric constant K of 106 was found to be due to chemical polarization caused by traced of acid on the material. It is concluded on the basis of conductivity measurements that the material is not an intrinsic semiconductor.

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