基于BaTiO3的超高储能密度陶通过界面极化策略
Changyuan Wang1, Wenjun Cao1, Cen Liang1
1Laboratory of Dielectric Functional Materials, School of Materials Science & Engineering, Anhui University, Hefei 230601, China.
ACS applied materials & interfaces
|August 29, 2023
概括
无介电陶显示出对脉冲动力设备的承诺. 通过将Sr$_{0.7}$Bi$_{0.2}$TiO$_{3}$ (SBT) 和Bi(Mg$_{0.5}$Hf$_{0.5}$) O$_{3}$ (BMH) 添加到BaTiO$_{3}$ (BT) 中,研究人员实现了增强的分解强度和能量储存.
科学领域:
- 材料科学 材料科学 材料科学
- 陶工程 陶工程 陶工程
- 固态物理 固态物理
背景情况:
- 无介电电容器对于脉冲动力应用至关重要.
- 这些材料的低分解强度 (Eb) 阻碍了储能性能.
- 界面极化和微观结构显著影响介电性质.
研究的目的:
- 为了提高无介电陶的储能性能.
- 为了抑制界面极化,并优化基于BaTiO3的陶中的微观结构.
- 为了研究Sr0.7Bi0.2TiO3 (SBT) 和Bi(Mg0.5Hf0.5) O3 (BMH) 添加剂的作用.
主要方法:
- 合成的 (1 - x) ((0.65BaTiO3-0.35Sr0.7Bi0.2TiO3) -xBi(Mg0.5Hf0.5) O3 (BSBT-xBMH) 陶. 这种陶是通过合成的.
- 分析了微观结构的变化和带间隙的扩大.
- 测量了分解强度 (Eb) 和可回收能量存储密度 (Wrec).
主要成果:
- 引入SBT和BMH降低了域大小和减弱的界面极化.
- 在BSBT-xBMH陶中实现了显著增强的Eb值.
- BSBT-0.10BMH组合表现出接近零的界面极化,超高的Eb (64kV/mm) 和Wrec (9.13 J/cm3).
结论:
- BSBT-0.10BMH陶具有出色的热和频率稳定性,符合X7R标准.
- 开发的陶显示了脉冲动力装置应用的巨大潜力.
- 优化微观结构和抑制界面极化是高性能无介电材料的关键.
相关概念视频
Potential Due to a Polarized Object
434
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
434
Dielectric Polarization in a Capacitor
4.8K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.8K
Trends in Lattice Energy: Ion Size and Charge
24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K


