2020 Volume 128 Issue 1 Pages 46-50
Pyrochlore-type silver tantalate, Ag0.93TaO2.97·0.94H2O (AT), and fluorite-type silver niobate Ag0.41Nb0.59O1.68 (AN), were prepared by ion-exchange reactions and their ion conductivities were measured from 25 to 240°C. The total conductivities (ionic + electrical) at 240°C of AT and AN reached 4.00 × 10−3 and 9.03 × 10−4 S/cm, respectively. The activation energy of AT was 0.61 eV and AN showed non-linear behavior with activation energies of 0.52 eV at temperatures less than 120°C and 0.33 eV at temperatures greater than 120°C. The crystal structures of AT and AN were maintained from 25 to 240°C.