Two-Step Sintering of the Pure K0.5Na0.5NbO3 Lead-Free Piezoceramics and Its Piezoelectric Properties

作者：Wang Daoli; Zhu Kongjun^*; Ji Hongli; Qiu Jinhao

来源：Ferroelectrics, 2009, 392(1): 120-126.

DOI：10.1080/00150190903412622

• K0
• 5Na0
• 5NbO3 solid solutions
• Lead-free
• Two-step sintering method
• Piezoelectric properties

The two-step sintering method was successfully applied to fabricate the lead-free alkaline niobate (K0.5Na0.5NbO3) piezoelectric ceramics, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were carried out to characterize the samples. The properties of density, piezoelectric and ferroelectric were also investigated. Under the optimal sintering process, the specimens with the relative density 95.2%, which exhibit good electrical properties (d33 = 121pC/N, kp = 35.2%, Qm = 5, epsilon r = 815). These results show that K0.5Na0.5NbO3 ceramic is a promising lead-free piezoelectric material for the ultrasonic delay-line applications, broadband transducers and sensors. The easy-controlling sintering process can be used in the other piezoelectric ceramics system.

• 出版日期2009
• 单位南京航空航天大学