研究了(Na0.8K0.2)0.5Bi0.5TiO3陶瓷的介电和压电性能,发现陶瓷从室温到500℃温度范围的介电谱中存在两个介电峰,电滞回线显示第一个介电峰由铁电-反铁电相变引起的,温度继续升高,反铁电相由宏畴变为微畴,微畴向顺电相转变导致了第二个介电峰,该峰对应的相变为弥散型相变。室温下陶瓷具有较高的剩余极化强度Pr=29.4μC/cm2和相对低的矫顽电场Ec=2.8kV/mm,极化后的陶瓷显示出较高的压电常数d33=120pC/N和机电耦合系数Kp28.5％,以及高的频率常数Nφ=2916Hz·m,120℃具有最小的谐振频率温度系数。
Dielectric and piezoelectric properties of (Na0.8K0.2)0.5Bi0.5TiO3 ceramics were
investigated. The results show that ferroelectric-antiferroelectric and antiferroelectric-paraelectric phase transition with relaxor characteristic
occur from room temperature to 500℃, leading to the two peaks of electric permittivity to temperature. At room temperature, it has relative
high remanent polarization Pr=29.4μC/cm2 and low conceive field Ec=2.8kV/mm. The polarized ceramics have good piezoelectric
properties such as piezoelectric constant d33=120pC/N, electromechanical coupling factor Kp=28.5%, frequency constant Nφ=2916Hz·m,
as well as minimum resonance frequency temperature coefficient at 120℃.
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