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Superfine powders (~100 nm) with compositions of (1 − x)(Bi0.5Na0.5)0.94Ba0.06TiO3 + xNb5+ (BNTBT6 + xNb) with x from 0 to 0.02 were synthesized by an improved citrate sol–gel method using Nb2O5 as Nb5+ source. The sintering behavior, microstructure, and various electrical properties of BNTBT6 + xNb ceramics were investigated. The results indicated that the addition of a small amount of Nb5+ has no...
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