A-site vacancy-induced giant strain and the electrical properties in non-stoichiometric ceramics Bi0.5+x(Na1-yKy)(0.5-3x)TiO3

作者：Ni Feng; Luo Laihui^*; Li Weiping; Chen Hongbing

来源：Journal of Physics D: Applied Physics , 2012, 45(41): 415103.

DOI：10.1088/0022-3727/45/41/415103

A-site vacancies were created in lead-free piezoelectric non-stoichiometric ceramics Bi0.5+x(Na1-yKy)(0.5-3x) TiO3 and Bi0.5+x(Na0.82K0.18)(0.5)TiO3, which were synthesized by a conventional solid-state reaction process. The ferroelectric properties, piezoelectric performances and strain behaviours of the as-prepared ceramics were characterized, and the effects of A-site vacancies on the ferroelectric properties, piezoelectric performances and strain behaviours of the ceramics were discussed. The results show that moderate A-site vacancies in the prepared ceramics enhance the piezoelectric performance of the ceramics, meanwhile, A-site vacancies lead to a decrement of depolarization temperature T-d. A large bipolar strain of 0.35% is achieved in the Bi-0.505(Na0.74K0.26) 0.485TiO3 ceramic at room temperature.

• 出版日期2012-10-17
• 单位宁波大学