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Results of investigation of electric transport properties of a new magnetically ordered hollandite compound with a composition K4Cu2Fe7V7O32 will be reported. Resistance versus temperature measurements (78-350 K) on the ceramic samples were carried out by means of four-lead dc, pulse and ac techniques. The temperature coefficient of resistance determined from R(T) measured by dc and pulse techniques has been found to be zero in 78-200 K range and it takes negative values in temperatures above 200 K. Additionally, hysteresis effect was observed in temperature range 200-310 K. Details of relationship between the resistance R and voltage U at different temperatures will be discussed. Surprisingly enough, the R(T) dependence of studied compound bears a characteristic features for amorphous material although the crystallinity of our samples has been confirmed by XRD and Mössbauer spectroscopy

Electric Properties of a New Ferrite K4Cu2Fe7V7O32 with a Hollandite-Type Structure

Electric Properties of a New Ferrite K₄Cu₂Fe₇V₇O₃₂ with a Hollandite-Type Structure