Elaboration de capteurs de gaz a partir de ceramiques conductrices ioniques de type NaSICON

摘要

The elaboration of Na~+ super-ionic conductor (NaSICON) ceramics is studied in this work. These solid electrolytes can be used as sensor for detection of polluted gases in air. Two sorts of ceramics with different chemical compositions are synthesised by soft chemistry route: a zirconium-based NaSICON and a hafnium-based NaSICON. DTA-TG and temperature depending X-ray diffractometry were used to follow the thermal decomposition of the precursor phases. The electrical properties of these ceramic sodium ionic conductors are investigated by complex impedance spectroscopy (CIS). the substitution of the zirconium by the hafnium increases the ceramic conductivity and decreases the activation energy E_a (from 0.29 to 0.12 eV).