(Bi0.5Na0.5)0.935Ba0.065TiO3-xBiScO3陶瓷储能及应变性能研究

doi:10.15541/jim20180198

摘要/Abstract

摘要：

本研究采用BiScO₃组分对固相烧结工艺制备的(1-x)(Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃(BNBT-xBS)无铅陶瓷进行改性, 考察了BiScO₃掺杂含量对陶瓷的微观结构、储能、场致应变和介电等性能的影响。结果表明: 随着BiScO₃掺杂含量的增加, BNBT-xBS陶瓷的相结构由三方相与四方相共存演变为伪立方相, 无杂相形成, 且平均晶粒尺寸略有增大; BiScO₃组分的引入破坏了BNBT陶瓷铁电畴的长程有序, 表现出弱极化, 且伴随有铁电相到弛豫铁电相的相变过程。BiScO₃组分提高了储能和应变性能, 在70 kV/cm电场下其最大储能密度为0.46 J/cm³, 电致应变达到0.25%。介电常数随着掺杂含量的增加逐渐降低, 其介电行为也表明陶瓷具有弛豫铁电体特征; BNBT-xBS陶瓷表现出负温度系数效应, 且在450℃以下具有较好的绝缘性。

关键词: BNBT-xBS, 储能, 应变, 无铅, 陶瓷

Abstract:

(1-x)(Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃ (BNBT-xBS) lead-free ceramics were fabricated by conventional ceramic sintering process and modified by BiScO₃. Effects of BiScO₃content on microstructure, energy storage, field-induced strain and dielectric properties of BNBT-xBS ceramics were investigated. The results indicated that the structure of BNBT-xBS ceramics without impurity phase transferred from the co-existence phase of rhombohedral and tetragonal phase to pseudo-cubic phase. Average grain size of BNBT-xBS ceramics grew slightly with increment of doping content. The long-range ferroelectric order of BNBT-xBS ceramics was destroyed by BiScO₃, which resulted in weak polarization. Meanwhile, the phase transition of BNBT-xBS ceramics was observed from a typical ferroelectric phase to relaxor phase. BiScO₃ dopants improved energy storage and strain performance of ceramics as well, whose maximum energy storage density and high strain were 0.46 J/cm³ and 0.25% at 70 kV/cm. The dielectric constant decreased with doping content increasing. Relaxor ferroelectric characteristics were also verified by temperature-dependence dielectric spectra. The resistance of BNBT-xBS ceramics illustrated a negative temperature coefficient and excellent electrical insulativity below 450℃.

Key words: BNBT-xBS, energy storage, strain, lead-free, ceramics

中图分类号:

TQ174

刘国保, 王华, 谢航, 庞思剑, 周昌荣, 许积文. (Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃陶瓷储能及应变性能研究[J]. 无机材料学报, 2018, 33(12): 1330-1336.

LIU Guo-Bao, WANG Hua, XIE Hang, PANG Si-Jian, ZHOU Chang-Rong, XU Ji-Wen. Energy Storage and Strain Property of (Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃ Ceramics[J]. Journal of Inorganic Materials, 2018, 33(12): 1330-1336.

图/表 7

图1 BNBT-xBS陶瓷(a)在2θ=20°~70°范围内的XRD图谱; (b) 2θ=39°~41°的放大图谱; (c) 2θ=45°~47°的放大图谱

Fig. 1 XRD patterns of BNBT-xBS ceramics at the range of (a) 2θ=20°-70°; (b) 2θ=39°-41°; (c) 2θ= 45°-47°

图2 BNBT-xBS陶瓷的表面形貌照片

Fig. 2 Surface morphologies of BNBT-xBS ceramics at(a) x=0; (b) x=0.025; (c) x=0.050; (d) x=0.075, and (e) x=0.100

图3 BNBT-xBS陶瓷的表面晶粒尺寸分布图

Fig. 3 Grain size distribution of BNBT-xBS ceramics at (a) x=0; (b) x=0.025; (c) x=0.050; (d) x=0.075, and (e) x=0.100

图4 (a) BNBT-xBS陶瓷的电滞回线, (b) BNBT-xBS陶瓷的储能密度(Wrec)和储能效率(η)与BS含量的关系曲线

Fig. 4 (a) P-E hysteresis loops of BNBT-xBS ceramics, (b) energy storage density (Wrec) and efficiency (η) of BNBT-xBS ceramics vs. BS content

图5 BNBT-xBS陶瓷的电致应变曲线

Fig. 5 Bipolar strain curves of BNBT-xBS ceramics

图6 BNBT-xBS陶瓷介电常数 ɛr 与介电损耗tanδ 随温度的变化曲线

Fig. 6 Temperature dependence of relative permittivity (εr) and loss tangent (tanδ) of BNBT-xBS ceramics(a) x=0; (b) x=0.025; (c) x=0.050; (d) x=0.075; (e) x=0.100

图7 BNBT-0.05BS陶瓷的(a)复阻抗谱和(b)变温- Z’’- f曲线

Fig. 7 (a) Complex impedance plots and (b) temperature dependence - Z’’- f of BNBT-0.05BS ceramic

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(Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃陶瓷储能及应变性能研究

Energy Storage and Strain Property of (Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃-xBiScO₃ Ceramics

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