New (1-x)K0.5Na0.5NbO3-x(0.15Bi(0.5)Na(0.5)TiO(3)-0.85Bi(0.5)Na(0.5)ZrO(3)) ternary lead-free ceramics: microstructure and electrical properties

摘要

Lead-free piezoelectric ceramics have attracted considerable attention owing to their environmental friendliness and good electrical properties. Here the new (1 - x)K0.5Na0.5NbO3-x(0.15Bi(0.5)Na(0.5)TiO(3)-0.85Bi(0.5)Na(0.5)ZrO(3)) [(1 - x) KNN-x(BNT-BNZ)] ternary lead-free piezoelectric ceramics synthesized by conventional solid sintering method are reported. The microstructure and electrical properties of (1 - x) KNN-x(BNT-BNZ) ternary ceramics were systematically investigated, and the ceramics with x = 0.06 possess enhanced piezoelectric properties and a high TC (e.g., d(33) similar to 318 pC N-1, k(p) similar to 0.43, and T-C similar to 326 degrees C), which are mainly ascribed to the R-T phase boundary involved. It is believed that, such a ceramic system is a promising candidate in the field of lead-free piezoelectric ceramics.