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Preparation of NASICON Using Sol–Gel Method and Reactivity with Alkali Carbonate for Potentiometric CO2 Gas Sensor

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Highly dense NASICON (Na1+xZr2SixP3−xO12, x = 2 and 3) electrolytes were synthesized using a sol–gel method for application in a CO2 gas sensor. The conductivity decreased by increasing the x value from 2 and 3. The x = 2 material is reactive to alkali carbonate (M2CO3, M = Li and Na) at 600 °C by forming the alkali rich NASICON. In the case of x = 3, the NASICON phase in the mixture with Li carbonate and Na carbonate is stable even at 700 °C, since all the alkali ion sites in the NASICON are filled by Na+ ions for x = 3. We confirmed that the EMF drift for the CO2 gas sensor using the x = 3 electrolyte is lower than that using the x = 2 electrolyte.
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Document Type: Research Article

Publication date: December 1, 2008

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