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The resistivities of selected vitreous t ernary lead silicates containing ions of g roups I , II, III, IV, and a lso the ions chromium, mangan ese, iron, cobalt, and nickel were meas ured in the range 2000 to 5000 C and at an applied direct-current fi eld of 525 volts per centimete r. In addition, the resis tivities of vitreous silica and of quartz, wit h opt ic ax is parallel and perpendicular to t he applied fi eld, were measured over t he same temperatu re range. The resulting data a re given as log resistivity-composi t ion isotherms for the alkalies and alkaline earths and as log resistivitytemperat ure curves for the other ions. Correlations between resistivity and bonding energy and between frequency factor and heat of activation are presented. The resistivit ies of the al kali lead silicates were interpreted from the standpoint of t he activation energy prin ciple.

Fundamental factors controlling electrical resistivity in vitreous ternary lead silicates