Dc conductivity and threshold switching properties of (V₂O₅)_75-x.(PbO)_x.SrO₂₅ glasses

Structure, dc conductivity, and electrical switching phenomena of some glasses with the composition (75-x)%V₂O₅.x%PbO.25%SrO, have been investigated. A broad amorphous structure of the glasses was established. Density is revealed to increase from 3.00 to 4.54 g/cm³, while molar volume and single bond strength of the glasses are found to decrease from 54.36 to 39.34 g/mol and from 265.85 to 213.1 kJmol⁻¹, respectively, with increasing the PbO content. Dc conductivity of the glasses is found to be affected by the surrounding temperature, with activation energy values increases from 0.39 to 0.64 eV with the increase of the mol% of PbO content. The studied glasses are established to present threshold switching performance at the higher lead content samples. The switching voltage is showed to grow with the growth of the PbO content, as well as with the increase of the thickness of the sample. The trap field voltage values are calculated for the non-switched samples and showed to increase from 4.9to27.6×1020 cm⁻³. Electrothermal model is found to best describe the investigated threshold switching results.