The effect of strontium doping in K 0.5 Na 0.5 NbO 3 (KNN) ceramics in the amount of 0.5, 2, 5 and 10 atom % is studied. With increasing dopant content the orthorhombic distortion of the perovskite solid solution is markedly reduced. The density of stoichiometric KNN sintered at 1115°C is 94.4% of TD, doping with 0.5% Sr leads to a 2% higher density, but with higher amounts of Sr the density decreases. The values of ϵ and d 33 for the undoped KNN ceramics are 450 and 80 pC/N, respectively. Sr—doping causes an increase in the dielectric constant, from 500 for KNN-0.5% Sr to 1650 for KNN-5% Sr and a decrease in the d 33 constant from 95 to 50 pC/N.
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Malič et al. (2005) studied this question.
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