MAISi_2O_6(M=Li, Na, K, Rb及びCs)のイオン導電性とその電位検出型CO_2ガスセンサーへの応用

概要

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Five kinds of alkali-metal aluminosilicate ceramics, MAISi_2O_6(M=Li, Na, K, Rb or Cs), were prepared by sintering a mixture of M_2CO_3, Al_2O_3 and SiO_2, and their properties as a solid electrolyte were investigated by designing a series of solid electrochemical cells such as(-)Co_2, O_2> Pt|MAISi_2O_6|Au, M_2CO_3, CO_2, O_2(+), for the CO_2 gas sensor, where MAISi_2O_6 functions as an alkali-metal ionic conductor. Electromotive force, EMF, increased linearly with an increase in the logarithmic value of carbon dioxide partial pressure, in accordance with the Nernst's law and the slope of the Nernst's equation suggests two electron reaction of carbon dioxide molecule at the detection electrode around 400℃. At this temperature, the 90% response times were about 1 min for all of the sensors. The sensor prepared KAISi_2O_6 as the solid electrolyte was found to work at the lowest temperature and over the widest temperature range.
1998-07-01