Electrical Conductivity of Some Copper Manganites

Abstract

Abstract The a.c. conductivity as a function of temperature was measured for ten prepared samples. The measurements were carried out in the temperature range 25–340°C. The sample CuMn2O4 prepared either from oxide or carbonate contains the least impurity content, while the sample Cu1.5Mn1.5O4 from oxide origin and Cu1.6Mn1.4O4 from carbonate origin contain the highest impurity content. The activation energy ΔE 1 values for the oxide origin samples are nearly the same of those obtained from carbonate origin. The variation of ΔE 2 values with concentration of copper content (x) appears to be consistent.