D. C. potential distributions in the cylindrical soda-lime glass specimen were studied by means of the probe-method with aid of an electrometer tube. Fine threeplatimurn probes of 0.05mm in dia. were sealed into, the glass, one of which wasat the center and other two of which were near at the anode and cathode respectively. Electrode materials contacted with the both ends of the annealed specimen were molten sodium salts, silver nitrate, and copper, platinum and pure mercury.In the ease of copper, surrounding atmosphere was evacuated in order to prevent the oxidation. The measurement were mainly carried out at about 300°C. The potential curves was linear between both electrodes when Na or Ag salts were employed as the anode. For Pt, Cu or mercury anode the curves of different types, distinguisεd in following respects, were obtained. (1) The potential drop increased near at anode layer, (2) The potential curve was linear except near the anode, but its inclination and the current decreased gradually.
From comparison of the conductivitieε, the normal conduction by Na ions was verified to take place in glass except the anode layer. In the anode layer, the composition of glass seemed different. Due to racking of Na ions, O
2- ions, strongly bonded to, the network, contributed on the condition.
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