Abstract
The thick film type sensor having Pt/Na Super Ionic Conductor(NASICON) solid electrolyte/Pt/<TEX>$Na_2$</TEX><TEX>$SO_4$</TEX>/Pt catalyst system for <TEX>$SO_2$</TEX>gas was fabricated by screen-print method. The phase of Na Super Ionic Conductor solid electrolyte sintered at different temperature of 1050, 1150,<TEX>$ 1250^{\circ}C$</TEX> and for different time of 1.5, 2.5, 3.5 hr were investigated by XRD. The Electromotive Force variation of the sensor with <TEX>$SO_2$</TEX>concentrations and operating temperatures were investigated. The major phase of Na Super Ionic Conductor film sintered at 115<TEX>$0^{\circ}C$</TEX> for 3.5 hr was sodium zirconium silicon phosphate(<TEX>$Na_3$</TEX>Zr<TEX>$_2$</TEX><TEX>$Si_2$</TEX>PO<TEX>$_{12}$</TEX>). The Nernst's slope of Na Super Ionic Conductor sensor for <TEX>$SO_2$</TEX>gas with the variation of concentration from 10 to 100 ppm was 167.14 ㎷/decade at the operating temperature of <TEX>$500 ^{\circ}C$</TEX>. The increase of oxygen partial pressure was not affected to the variation of Nernst's slope.e.
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