基于丝网印刷技术的织构化 NBBT 陶瓷的增强电学性能。
Enhanced electrical properties of textured NBBT ceramics derived from the screen printing technique.
机构信息
The Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.
出版信息
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。
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