The Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Oct;58(10):2036-41. doi: 10.1109/TUFFC.2011.2053.
(001)(pc)-oriented (Na(0.5)Bi(0.5))(0.94)Ba(0.06)TiO(3) (NBBT) lead-free piezoelectric ceramics were fabricated by the screen printing technique using Na(0.5)Bi(0.5)TiO(3) (NBT) templates. The plate-like NBT template particles were synthesized from bismuth layer-structured ferroelectric Bi(4)Ti(3)O(12) (BiT) precursors by the topochemical method. The screen printed NBBT ceramics with 20 wt% NBT templates contained a large fraction of grains aligned with their c-axis normal to the sample surface, giving a Lotgering factor of 0.486. The dielectric and ferroelectric properties of textured NBBT ceramics were anisotropic. Compared with the non-textured NBBT ceramics, the dielectric, ferroelectric, and piezoelectric properties of the textured NBBT ceramics were improved, giving a dielectric constant ϵ(T)(33)/ϵ(0) of 910, a remnant polarization P(r) of 29.2 μC/cm(2), a coercive field E(c) of 23.5 kV/cm, a piezoelectric coefficient d(33) of 180 pC/N, and a thickness-mode electromechanical coupling coefficient k(t) of 0.485.
(001)(pc)-取向的 (Na(0.5)Bi(0.5))(0.94)Ba(0.06)TiO(3) (NBBT) 无铅压电陶瓷通过使用 Na(0.5)Bi(0.5)TiO(3) (NBT) 模板的丝网印刷技术制备。板状 NBT 模板颗粒通过拓扑化学方法从铋层状铁电体 Bi(4)Ti(3)O(12) (BiT) 前体合成。含有 20wt% NBT 模板的丝网印刷 NBBT 陶瓷中包含很大一部分晶粒沿其 c 轴垂直于样品表面排列，Lotgering 因子为 0.486。织构化 NBBT 陶瓷的介电和铁电性能具有各向异性。与非织构化 NBBT 陶瓷相比，织构化 NBBT 陶瓷的介电、铁电和压电性能得到了改善，介电常数 ϵ(T)(33)/ϵ(0)为 910，剩余极化 P(r)为 29.2 μC/cm(2)，矫顽场 E(c)为 23.5 kV/cm，压电系数 d(33)为 180 pC/N，厚度模式机电耦合系数 k(t)为 0.485。
