Determination of amorphous layers on thick film Nasicon in dependence on different sintering processes |
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Authors: | S Brosda H Wulff U Krien U Guth |
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Institution: | (1) Institute of Physical Chemistry, Ernst-Moritz-Arndt-University Greifswald, Germany |
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Abstract: | In thick film gas sensors Nasicon is used as a solid electrolyte with high Na+ ionic conductivity. Sensors like CO2, O2, Pt ▮ Na2CO3, BaCO3 ∥ NASICON Pt]glass, O2, CO2 are suitable to measure the CO2-concentration over 5 orders of magnitude. To characterize the screen printed Nasicon as a main component of such sensors
grazing incidence diffractometry (GID), SEM, impedance spectroscopy and dc polarization measurements are performed in order
to improve the long-term stability. The sintering process of the thick film influences the chemical surface composition of
Nasicon and as a consequence the response of the sensor. Nasicon films sintered at temperatures between 1070 and 1210 °C show
an amorphous layer increasing up to 1.1 μm thickness on the surface. Impedance measurements show, that cells using in such
a way prearated Nasicon are responsible for water vapour.
Paper presented at the 1st Euroconference on Solid State Ionics, Zakynthos, Greece, 11 – 18 Sept. 1994 |
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