ＣｕＯ‐Ｖ?S２?TＯ?S５?T‐Ｐ?S２?TＯ?S５?T系ガラスの電気伝導及びスイッチング

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タイトル別名
  • Electric Conduction and Switching of the Glass in the System CuO-V<sub>2</sub>O<sub>5</sub>-P<sub>2</sub>O<sub>5</sub>
  • CuO V2O5 P2O5ケイ ガラス ノ デンキ デンドウ オヨビ スイッチ

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Studies on the electric conduction of the glass in the system CuO-V2O5-P2O5 have been carried out to elucidate the electronic conduction by the hopping between two kinds of transition metal ions and the switching phenomena of highly conductive glass.<br>The composition of the glass containing maximum amounts of transition metal oxides was found to be 0.25-0.4CuO, 0.7-0.55V2O5 and 0.05P2O5. The existence of low valence oxides was confirmed by the weight increase as heating the glass in oxidation atmosphere.<br>The electric conductivity of the 4V2O5⋅P2O5 glass at 200°C increased from 2×10-3 to 7×10-3Ω-1cm-1 by the addition of CuO from 0 to 40mol%, which decreased the amount of V2O5 from 80 to 50mol%. The conductivity becomes about one hundredth by the corresponding decrease of V2O5 in V2O5-P2O5 glass. Therefore, CuO seemed to contribute to the electric conduction by the same magnitude as V2O5.<br>The abrupt increase of conductivity, that is switching, was observed when the electric field higher than the threshold voltage Vth was applied between the wedge electrodes on the surface of the glass. The relation between logVth and logR (the resistivity of glass between electrodes) was nearly linear havinng the inclination of 2. LogL (inter-electrode distance) was also linear to logEth(Vth/L) and its inclination was -0.85. The relation between the threshold switching and the Joule heat was considered from these results. However, from the measurement of the increase of electric current with applying time of various high voltage, it was found that the Joule heat given by electric current before switching started became rather smaller, the higher the applied electric field. Therefore, the switching seemed to be caused not only by the Joule heat, but also by some other effects, such as the increase of conduction electron by applying high electric field.<br>In the cage of applying the field higher than the threshold voltage, the dendrite crystalline being rich in Cu oxide developed in the glass from cathode to anode. The deposition of crystalline was attributed to the migration of Cu ion. The more drastic change of the glass was the formation of the molten path between electrodes. The threshold voltage decreased at the second cycle, because the conductivity of the developed crystal or the molten path was higher than the original glass.

収録刊行物

  • 窯業協會誌

    窯業協會誌 87 (1007), 349-355, 1979

    公益社団法人 日本セラミックス協会

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