Journal of Electroceramics ( IF 1.7 ) Pub Date : 2018-09-26 , DOI: 10.1007/s10832-018-0161-y Trang An Duong , Hyoung-Su Han , Young-Hwan Hong , Young-Seok Park , Hoang Thien Khoi Nguyen , Thi Hinh Dinh , Jae-Shin Lee
This study investigated the microstructure, crystal structure, and electrical properties of (1 − x)Bi1/2Na1/2TiO3–xSrTiO3 (BNST100x; x = 0.20, 0.22, 0.24, 0.26, 0.28, and 0.30) lead−free piezoceramics. The average grain size of BNST100x ceramics decreased with increasing SrTiO3 content. A phase transition from nonergodic relaxor (NER) to ergodic relaxor (ER) was observed at x = 0.26, and the highest unipolar strain under 4 kV/mm electric field, of 0.25% (d33* ≈ 620 pm/V), was obtained at x = 0.28. We found that the BNST26 and BNST28 compositions yielded the competitive advantage of larger strain values under lower operating fields compared with other BNT–based lead–free piezoelectric ceramics. Therefore, we regard these ceramics as promising candidates for actuator applications.
中文翻译:
Bi的介电和压电性能
这项研究调查了(1- x)Bi 1/2 Na 1/2 TiO 3 – x SrTiO 3(BNST100 x;x = 0.20、0.22、0.24、0.26、0.28和0.30的微观结构,晶体结构和电性能。 )无铅压电陶瓷。BNST100 x陶瓷的平均晶粒尺寸随SrTiO 3含量的增加而减小。在x = 0.26处观察到了从非遍历弛豫(NER)到遍历弛豫(ER)的相变,在4 kV / mm电场下的最高单极应变为0.25%(d 33 * ≈620 pm / V)。在x获得 = 0.28。我们发现,与其他基于BNT的无铅压电陶瓷相比,在较低的工作范围内BNST26和BNST28成分具有更大的应变值的竞争优势。因此,我们认为这些陶瓷是执行器应用的有希望的候选者。