Synthesis, structure determination and electrical properties of β-K0.399V2.623W0.377O7.5 with mixed occupation of vanadium and tungsten elements

According to the calculated values of the activation energy, the electrical conductivity measurement as function of various temperatures ranging (between 400 and 625 K) and frequency (100-105 Hz) shows a semi-conductor behavior for K0.399V2.623W0.377O7.5.