Effect of the content of MnO on the electric-dielectric properties of potassium-phosphate glasses

This paper deals with the investigation of the electrical conductivity and dielectric properties,including dielectric constant (ε'),dielectric losses (tanδ) and ionic conductivity (σ) as a function of temperature ranging from room temperature to 540 °c at a fixed applied frequency of 100 khz for some phosphate glasses in the ternary k2o-mno-p2o5 system. the compositions chosen for the study are (50-x)k2o-xmno-50p2o5 (20-35 mol%) and xk2o-20mno-(80-x)p o5 (15-30 mol%),which were prepared by the conventional melt quenching technique. the amorphous nature of the samples was asserted by x-ray diffraction. the values of the dielectric parameters (viz.,ε',tan δ and σ) decrease by increasing manganese oxide concentration and increase by increasing temperature. the observed decrease in the dielectric parameters,with increasing amount of mno,can be explained as the result of formation of more compact and integrated glass structure,leading to a decrease of the polarization. the conductivity-temperature data obeys to the classical arrhenius relationship. the ionic conductivity σ increases substantially with increasing concentration of potassium oxide and diminishes with increasing concentration of mno. the activation energy values of the studied glasses were calculated the structural role of manganese oxide was determinate. © 2017,university of mohammed premier oujda morocco.