Electronic and ionic conductivities of Na0.44Mn1-xTixO2

Abstract

The Na0.44Mn1-xTixO2 (x=0, 0.11, 0.22, 0.33, 0.44) were prepared from Na2CO3, Mn2O3, and TiO2 via the sintering, and their electronic and ionic conductivities were investigated through a four-electrode impedance measurement. As x increased, the electronic conductivity decreased drastically from 6x10-3 Scm-1 to 2x10-5 Scm-1 at 500 K, and the ionic conductivity changed nonlinearly in the range from 2x10-6 Scm-1 to 5x10-5 Scm-1 at 500 K with a maximum at x=0.22.