Structure, Ferroelectric, Piezoelectric, and Ferromagnetic Properties of BiFeO3‐BaTiO3‐Bi0.5Na0.5TiO3 Lead‐Free Multiferroic Ceramics
Structure, Ferroelectric, Piezoelectric, and Ferromagnetic Properties of BiFeO3‐BaTiO3‐Bi0.5Na0.5TiO3 Lead‐Free Multiferroic Ceramics
复制标题
DOI：
10.1111/jace.13169
复制
发表时间：
2014-11
影响因子：
3.9
通讯作者：
Ying Li;Na Jiang;K. Lam;Yongquan Guo;Qiaoji Zheng;Qiang Li;Wei Zhou;Y. Wan;Dunmin Lin
中科院分区：
文献类型：
--
作者：
Ying Li;Na Jiang;K. Lam;Yongquan Guo;Qiaoji Zheng;Qiang Li;Wei Zhou;Y. Wan;Dunmin Lin
采用常规陶瓷工艺制备了具有钙钛矿结构的(0.70−x)BiFeO_3-0.30BaTiO_3-xBI(Zn_(0.5)Ti_(0.5)O_3)O_3+1mol%MnO_2复相陶瓷，研究了Bi(Zn_(0.5)Ti_(0.5)O_3)O_3掺杂和烧结温度对其显微结构、多铁性和压电性的影响。所有陶瓷都具有纯的钙钛矿结构，没有检测到第二相。在陶瓷中加入少量的Bi(Zn0.5Ti0.5)O_3(x≤)，改善了陶瓷的铁电性能和压电性能，促进了陶瓷的晶粒长大。但过量的Bi(Zn_(0.5)Ti_(0.5))O_3(x-≥_(0.10))阻碍了晶体的生长，降低了铁电性和压电性，并在高温下引起了两个介电反常现象。该陶瓷在很宽的烧成温度范围内(880-980℃)烧成良好，具有良好的致密性(相对密度：96.2-98.4%)和良好的电绝缘性能。烧结温度的提高促进了陶瓷的晶粒长大，提高了陶瓷的铁电性。在x=0.0411~0.0422μ/g、Hc为1.7~1.99Koe的高居里温度范围内，陶瓷的铁磁性较弱，剩余磁化强度为0.0411~0.0422 emu/g，矫顽场Hc为1.7~1.99Koe。
Multiferroic ceramics of (0.70−x)BiFeO3–0.30BaTiO3–xBi(Zn0.5Ti0.5)O3 + 1 mol% MnO2 with perovskite structure were prepared by a conventional ceramic technique and the effects of Bi(Zn0.5Ti0.5)O3 doping and sintering temperature on the microstructure, multiferroic and piezoelectric properties of the ceramics were studied. All the ceramics possess a pure perovskite structure and no second phases can be detected. After the addition of a small amount of Bi(Zn0.5Ti0.5)O3 (x ≤ 0.05), the ferroelectric and piezoelectric properties of the ceramics are improved and the grain growth is promoted. However, excess Bi(Zn0.5Ti0.5)O3 (x ≥ 0.10) retards the grain growth, degrades the ferroelectricity and piezoelectricity, and induces two dielectric anomalies at high temperature. The ceramics can be well sintered at the very wide range of low sintering temperatures (880–980 °C) and exhibit good densification (relative density: 96.2–98.4 %) and strong electric insulation. The increase in the sintering temperature promotes the grain growth and improves the ferroelectricity of the ceramics. The ceramic with x = 0.05 sintered at 880–980 °C possesses improved ferroelectric and piezoelectric properties with remanent polarizations Pr of 21.9–28.1 μm/cm2, piezoelectric constants d33 of 125–139 pC/N and planar electromechanical coupling factors kp of 30.1–32.4 %, and high Curie temperatures TC of 523–565 °C. A weak ferromagnetism with remanent magnetizations Mr of 0.0411–0.0422 emu/g and coercive fields Hc of 1.70–1.99 kOe were observed in the ceramics with x = 0–0.025.