x)(Ba 0.85Ca 0.15)(Ti 0.93Zr 0.07)O 3- x(Bi 0.5K 0.5)TiO 3 ceramics]]>

摘要

AbstractLead free solid solution ceramics (1-x)(Ba0.85Ca0.15)(Ti0.93Zr0.07)O3-x(Bi0.5K0.5)TiO3[(1-x)BCZT–xBKT,x?=?0, 0.02, 0.04, 0.06, 0.08?mol%] were fabricated by the traditional solid-state reaction technique. The crystalline phase was confirmed by X-ray diffraction (XRD) patterns and Raman spectra, the results show that a pure ABO3perovskite structure was obtained in all of these samples, suggesting that BKT diffused into BCZT to form a solid solution. The microstructure and crystal structure were investigated by thermal field emission scanning electron microscopy (TFESEM) and field emission transmission electron microscopy (FETEM) respectively. The results show that all of these samples exhibited relatively higher density structure. Monocrystal and polycrystal coexistence structure was obtained in BKT doped ceramics at room temperature. In addition, the piezoelectric, dielectric and ferroelectric properties were systematically studied. The ceramic withx?=?0.04?mol% BKT demonstrates good properties:d33?=?162?pC/N,Tc?=?103.1?°C,kp?=?46.2%,εr?=?2,390, tanδ?=?1.5%,Pr?=?9.33?μC/cm2,Ec?=?0.80?kV/mm.Graphical abstractDisplay OmittedHighlights?The combination of BCZT with BKT is helpful to improve electrical properties.?Coexistence of monocrystalline and polycrystalline is found in BKT doping ceramics.?The optimized performance is obtained when BKT doping content is 0.04?mol%.?(1-x)BCZT-xBKT lead free ceramics exhibit relaxor ferroelectric characteristics.]]>