通过谷物边界分离进行微结构优化,以提高BaTiO3多层陶电容的直流偏离电介性能3多层陶电容
Ji-Sang An1, Juneseo Ahn1, Younghwan Lim1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea.
Advanced materials (Deerfield Beach, Fla.)
|July 28, 2025
概括
单元添加剂Fe3+和Ni2+使高级多层陶电容器 (MLCC) 的细粒度BaTiO3成为可能. 优化的材料实现了高容量和稳定性,这对于下一代电子设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 陶工程 陶工程
- 纳米技术纳米技术
背景情况:
- 多层陶电容 (MLCC) 是重要的电子元件.
- 提高电容性需要更薄的陶层,在粒径控制和高电场稳定性方面提出了挑战.
- 目前的MLCC通常依赖于昂贵的稀土元素.
研究的目的:
- 为MLCCs开发一个生产细粒度BaTiO3的成本效益高的战略.
- 为了研究单元素添加剂 (Fe3+,Ni2+) 对谷物生长抑制的影响.
- 优化BaTiO3微结构以提高容量和可靠性.
主要方法:
- 使用单元素添加剂 (Fe3+,Ni2+) 来控制 BaTiO3.3 中的谷物生长.
- 分析了添加剂的谷物边界分离.
- 烧结BaTiO3陶以获得细粒度的微观结构.
- 具有特征的介电性质 (允许性,损耗) 和在高直流偏差下稳定性.
主要成果:
- Fe3+和Ni2+添加剂通过在谷物边界分离,有效地抑制了谷物生长.
- 优化的BaTiO3样本实现了稳定的高电容性 (≈103),低介电损失,并提高了可靠性.
- 确定了≈200 nm的理想粒度大小,用于在高直流偏差 (> 4 V μm-1) 下最大限度地提高电容.
- 开发了没有稀土元素的细粒度微观结构.
结论:
- 单元添加剂提供了一种可行的,具有成本效益的方法来控制BaTiO3.3中的粒径.
- 优化的细粒度BaTiO3表现出优良的介电性质和稳定性,适用于先进的MLCC应用.
- 将介电层厚度降低到200nm是未来高性能MLCC的一个有希望的途径.
相关概念视频
MOS Capacitor
973
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
973
Dielectric Polarization in a Capacitor
5.0K
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...
5.0K
Capacitor With A Dielectric
4.1K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.1K
Electrostatic Boundary Conditions in Dielectrics
1.4K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.4K
Biasing of Metal-Semiconductor Junctions
335
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
335
Spherical and Cylindrical Capacitor
6.0K
A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
6.0K


