Abstract
Ceramic solid solutions (1-x)(Bi0.9Nd0.1)(Sc0.9B0.1)O3 - xPbTiO3 (x = 0.60–0.66; B - Lu, Yb, Er, Y) based on the compositions close to the morphotropic boundary, have been prepared. To improve the phase content and the resistance of ceramics, Bi2O3 and MnO2 additives were used. Phase composition, structure, microstructure, phase transitions, ferroelectric and piezoelectric properties have been studied. The 1st order ferroelectric phase transitions are marked by peaks near 700–750 K in dielectric permittivity and dielectric loss temperature dependences. Effect of dielectric relaxation was observed, its relation to composition of ceramics determined. The Curie temperature TC increase was observed with increasing the PbTiO3 constituent, while the TC decrease is typical of the A- or B-cations doped compositions. Introduction of MnO2 and/or Bi2O3 additives lead to the decrease of total conductivity and dielectric losses to more than one order at elevated temperatures. Enhanced d33 and kt values were measured in modified ceramics.
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