Abstract
Fifteen kinds of sodium rare earth silicate glasses and ceramics with (Na 2O) 35.7(RE 2O 3) 7.2(SiO 2) 57.1 (RE = Y, Sm, Gd, Dy, Ho, Er and Yb) composition were synthesized from a mixture of Na 2CO 3, RE 2O 3 and SiO 2. The densities of the glasses were in fairly good agreement with the theoretical densities and were 0.2–0.41 g cm −3 larger than those of the polycrystalline ceramics. The conductivities of the glasses are 1–2 orders lower than those of the ceramics and the highest electrical conductivity was achieved for the Yb ceramic sample with the smallest ion radius of RE 3+. The electromotive force, EMF, of the potentiometric CO 2 gas sensors using (Na 2O) 35.7(Y 2O 3) 7.2(SiO 2) 57.1 glass and ceramic increased linearly with an increase in the logarithm of CO 2 partial pressure, in accordance with Nernst's law. It was suggested from the slope of Nernst's equation that the two electron-transfer reaction associated with the carbon dioxide molecule takes place at the detection electrode above 450 °C.
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