Relaxor behavior and ferroelectric properties of a new Ba4SmFe0.5Nb9.5O30 tungsten bronze ceramic

Relaxor behavior and ferroelectric properties of a new Ba4SmFe0.5Nb9.5O30 tungsten bronze ceramic
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新型Ba4SmFe0.5Nb9.5O30钨青铜陶瓷的弛豫行为和铁电性能

DOI:
10.1016/j.ceramint.2016.06.147
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发表时间:
2016-10
影响因子:
5.2
通讯作者:
Liang Fang
Liang Fang
中科院分区:
材料科学1区
文献类型:
--
作者:
Changzheng Hu;Zhen Sun;Qihua Zhu;Fengqi Lu;Chunchun Li;Laijun Liu;Liang Fang

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采用常规固相烧结法制备了Ba4SmFe0.5Nb9.5O30无填料钨青铜陶瓷。研究了其物相、微观结构、介电和铁电性能。室温XRD测试结果表明,该陶瓷为四方晶系,空间群为P4 bm,晶胞参数为a =B=12.4712(2)nm,c =3.9430(2)nm。介电性能、XRD和拉曼光谱测试结果表明,BSFN陶瓷在35 °C ~ 450 °C温度范围内没有发生相变。拟合的Vogel-Fulcher关系与活化能Ea为0.11 eV表明一个明确的介电弛豫状态附近的室温。此外,BSFN陶瓷的剩余极化和矫顽场分别为3.45 µC/cm 2和24.65 kV/cm。
Unfilled tungsten bronze ceramics with a composition of Ba4SmFe0.5Nb9.5O30were prepared by the conventional solid-state sintering method. The phase, microstructure, dielectric and ferroelectric properties were studied. Room temperature XRD results indicated that the ceramic occurs in the tetragonal space group P4bm phase with cell parameters ofa=b=12.4712(2) Å andc=3.9430(2) Å. The temperature-dependent dielectric properties, XRD data and Raman spectra data indicated that BSFN ceramics exhibit no phase changes from 35 °C to 450 °C. Fitting of a Vogel-Fulcher relationship with an activated energyEaof 0.11 eV indicates an unambiguous dielectric relaxor state near room temperature. Furthermore, the BSFN ceramics exhibited residual polarization and coercive field of 3.45 µC/cm2and 24.65 kV/cm, respectively.
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