High pressure studies on the electrical resistivity of As–Te–bond Si glasses and the effect of network topological thresholds

Abstract

The variation of resistivity in an amorphous As 30 Te 70−x Si x system of glasses with high pressure has been studied for pressures up to 8 GPa. It is found that the electrical resistivity and the conduction activation energy decrease continuously with increase in pressure, and samples become metallic in the pressure range 1.0-2.0 GPa. Temperature variation studies carried out at a pressure of 0.92 GPa show that the activation energies lie in the range 0.16-0.18 eV. Studies on the composition/average co-ordination number r dependence of normalized electrical resistivity at different pressures indicate that rigidity percolation is extended, the onset of the intermediate phase is around r = 2.44, and completion at r = 2.56, respectively, while the chemical threshold is at r = 2.67. These results compare favorably with those obtained from electrical switching and differential scanning calorimetric studies.

High pressure studies on the electrical resistivity of Ge–Te–Tl glasses

“…[12,[24][25][26] Figure 5 shows the behavior of the normalized resistivity as a function of composition at a constant pressure of 1.9 GPa. Unlike the As-Te-Si glasses reported earlier, [12] no signatures of topological thresholds were observed in the present Ge-Te-Tl glasses. This is in agreement with the results of the switching behavior which also do not show the presence of topological thresholds, and the suggestion that the added thallium tends to fragment the network is supported.…”

“…[9,10] Further V-VI chalcogenide glasses are usually found to remain a semiconductor even up to 10 GPa. [11] Ternary glasses such as As-Te-Si [12] and As-Te-In [13] also show continuous metallization under high pressure.…”

Variation of Electrical Resistivity with High Pressure in Ge-Te-Sn Glasses: A Composition Dependent Study

“…Further most VVI chalcogenide glasses are usually found to remain a semiconductor even up to 10 GPa. Ternary glasses such as AsTeSe [16], AsTeSi [17] and As TeIn [18] also show continuous metallization under high pressure.…”