کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1465514 | 989697 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and properties of Bi0.5(Na1−x−yKxAgy)0.5TiO3 lead-free piezoelectric ceramics Synthesis and properties of Bi0.5(Na1−x−yKxAgy)0.5TiO3 lead-free piezoelectric ceramics](/preview/png/1465514.png)
Bi0.5(Na1−x−yKxAgy)0.5TiO3 piezoelectric ceramics were prepared by conventional ceramic processes. X-ray diffraction patterns show a pure perovskite structure, indicating that the K+ and Ag+ ions substitute for the Na+ ions in Bi0.5Na0.5TiO3. The temperature dependence of the dielectric constant and dissipation factor shows all ceramics to experience two phase transitions: from ferroelectric to anti-ferroelectric and from anti-ferroelectric to paraelectric. The transition temperature from ferroelectric to anti-ferroelectric and the temperature at which the dielectric constant reaches its maximum value decrease with the increase of K+ amount. At room temperature, the ceramics containing 17.5–20 mol% K+ and 2 mol% Ag+ exhibit high piezoelectric constant (d33 = 180 pC/N) and high electromechanical coupling factor (kp = 35%).
Journal: Ceramics International - Volume 33, Issue 8, December 2007, Pages 1445–1448