High temperature lead-free BNT-based ceramics with stable energy storage and dielectric properties†,Journal of Materials Chemistry A

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High temperature lead-free BNT-based ceramics with stable energy storage and dielectric properties†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-11-22 , DOI: 10.1039/c9ta10347c
Chaoqiong Zhu _{1,

2,

3,

4,

5} , Ziming Cai _{1,

2,

3,

4,

5} , Bingcheng Luo _{1,

2,

3,

4,

5} , Limin Guo _{5,

6,

7,

8} , Longtu Li _{1,

2,

3,

4,

5} , Xiaohui Wang _{1,

2,

3,

4,

5}

Affiliation

High-temperature dielectric ceramics are in urgent demand due to the rapid development of numerous emerging applications. However, producing dielectric ceramics with favorable temperature, frequency and electric field stability is still a huge challenge. The construction of multi-phase coexistence material systems is an effective way to obtain stable dielectric and energy storage properties. In this work, NaNbO₃ (NN) modified 0.95Bi_0.5Na_0.5TiO₃–0.05SrZrO₃ (BNTSZ) ceramics ((1 − x)BNTSZ–xNN) are designed to achieve the coexistence of rhombohedral and tetragonal phases. The variation in the dielectric permittivity of the 0.8BNTSZ–0.2NN ceramic is less than ±15% over the temperature range from −55 °C to 545 °C, which is the reported record-high upper operating temperature, with a high room-temperature dielectric permittivity of 1170. The 0.8BNTSZ–0.2NN ceramic exhibits excellent frequency and electric field stability as well. Additionally, a large discharge energy density of 3.14 J cm⁻³ is obtained in the 0.85BNTSZ–0.15NN ceramic with an energy efficiency of 79% at a high temperature of 120 °C under 230 kV cm⁻¹, with the variation in the discharge energy density being less than ±4% in the temperature range from 25 °C to 180 °C under 120 kV cm⁻¹. All these features demonstrate that the (1 − x)BNTSZ–xNN ceramics are promising candidates for use at extremely high temperature in both dielectric and energy storage capacitor applications.

中文翻译：

高温无铅BNT基陶瓷，具有稳定的能量存储和介电性能†

由于众多新兴应用的迅速发展，对高温介电陶瓷的需求迫切。然而，生产具有良好的温度，频率和电场稳定性的介电陶瓷仍然是巨大的挑战。多相共存材料体系的构建是获得稳定的介电和储能性能的有效途径。在这项工作中，NaNbO ₃（NN）改性了0.95Bi _0.5 Na _0.5 TiO ₃ –0.05SrZrO ₃（BNTSZ）陶瓷（（1- x）BNTSZ– xNN）旨在实现菱形和四方相的共存。在-55°C至545°C的温度范围内，0.8BNTSZ-0.2NN陶瓷的介电常数变化小于±15％，这是据报道的最高工作温度，而室温下则较高。温度介电常数为1170。0.8BNTSZ-0.2NN陶瓷也具有出色的频率和电场稳定性。另外，3.14Ĵ厘米大的放电能量密度^-3在0.85BNTSZ-0.15NN陶瓷79％在高温下的120℃的能效下230千伏厘米获得^-1，随着变化在120 kV cm ^-1下在25°C至180°C的温度范围内放电能量密度小于±4％。所有这些特征表明，（1- x）BNTSZ– x NN陶瓷有望在极高温度下用于介电和储能电容器应用。

更新日期：2020-01-02

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