Abstract
Bivalent ions equivalent substitution and equimolar substitution for Ag+ in silver niobate tantalate ceramic were studied, which will result in Ag0.98A0.01(Nb0.8Ta0.2)O3 and Ag0.98A0.02 (Nb0.8Ta0.2)O3 respectively, where A2+ = Mg2+, Ca2+, Sr2+, Ba2+, Cu2+, Pb2+. The samples were synthesized by traditional solid method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of a little Ag+ (in mol ratio 2 %) on the dielectric properties in Mg2+, Ca2+, Sr2+, Ba2+, Cu2+, Pb2+ substituted samples, and the influences of radius and ionic electronegativity on the dielectric properties were discussed. The results showed that the substitution of most bivalent ions except large Ba2+ ions for a little Ag+ (in mol ratio 2 %) showed no obvious change on the perovskite structure and microstructure of Ag(Nb0.8Ta0.2)O3 ceramics. Basically, the dielectric properties of equivalent substituted samples were better than that of equimolar equimolar substituted samples, Ca2+ equivalent substituted samples showed lower dielectric loss, and Cu2+ equivalent substituted samples showed higher dielectric constant.
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