The Behavior of Dielectric Properties in the Solid Solutions Based on Na0.5Bi0.5TiO3 and Na0.5K0.5NbO3
摘要
In this work, the ceramics of (1 – x)Na0.5K0.5NbO3 – xNa0.5Bi0.5TiO3 were prepared by conventional solid state method. At room temperature in studied system, two morphotropic phase transitions occur near the extreme components of the system: (i) from tetragonal to pseudocubic at 0.1 < x < 0.2 and (ii) from pseudocubic to rhombohedral at x > 0.9. The best storage properties are observed near these transitions: Weff = 0.6 J/cm3 and η = 63%, at x = 0.2; Weff = 0.1 J/cm3 and η = 75% at x = 0.9 for E = 25 kV/cm and E = 27 kV/cm, respectively. Therefore, the ceramic with 0.1 < x < 0.2 and 1.0 < x ≤ 0.9 is promising candidate lead-free materials for energy storage devices.