Structural parameters in dispersion strengthened copper-alumina : J.Zrnik et al. (Technical University, Kosice, Czech Republic.) PokrokyPraskove Metal., vol 37, no 1, 1999, 32–37. (In Czech.)

Abstract

This work compared the effects of different sintering methods on the microstructure and anti-ferroelectric properties of lead-free 0.89Bi0.5Na0.5TiO3–0.06BaTiO3–0.05K0.5Na0.5NbO3 ternary system ceramics. The ceramics by two-step sintering method had smaller grain size and more uniform microstructure than those of the ceramics by single-step sintering method. The mechanism of grain growth in different sintering methods is discussed. The ceramics by two-step sintering method exhibited better anti-ferroelectricties than those of the ceramics by single-step sintering method. The polarization hysteresis (P–E) loop showed optimum electrical performances with a low remanent polarization (Pr=5.4 μC/cm2) and a coercive field (Ec=8.2 kV/cm), and the energy density (W) reached 0.90 J/cm3 at 10 Hz. The storage capacity is three times that of the single-step sintering ceramics.