Abstract
In this paper, the ultrafine powders of the solid solution (Cd 1− x Ag x ) 2Sb 2O 6.8 were prepared by a chemical coprecipitation process. The powders were proved by X-ray diffraction (XRD) to bear a similar defect pyrochlore structure to Cd 2Sb 2O 6.8 when x≤10 mol%. The results show that the doped silver ion affects the conductance as well as the gas-sensing properties, and the conductance decreases steadily with the increasing silver content while the sensitivity of the sample with x=0.05 to 1000 ppm C 2H 5OH is about five times that of the pure Cd 2Sb 2O 6.8. Meanwhile, the doping lifted the selectivity toward gasoline and reduced the optimum operating temperature. All of these suggest this solid solution as a candidate for practical alcohol sensors.
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