电子结构的整洁和精确调整,使用多功能应变工程
Kai Yao1, Fei Pan2, Lixin Song3
1Shanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, China; Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
Science bulletin
|November 6, 2025
概括
我们开发了一种新的方法,使用拉伸式应变来增强金属氧化物中微波吸收. 这种技术精确调整电子结构,大大提高了先进应用的材料性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 化学 化学 化学
背景情况:
- 在过渡金属氧化物中精确控制电子结构对于功能性材料至关重要.
- 传统的化学合成方法往往会带来不必要的副作用,阻碍精确的控制和机械的理解.
研究的目的:
- 引入一种新的策略,用于调整金属氧化物的电子结构,使用火诱导的晶格拉伸应变.
- 研究拉伸应变对d-p轨道杂交的影响及其对微波吸收特性的影响.
主要方法:
- 通过一种简单的火方法诱导网格拉伸.
- 分析电子结构的变化,特别是 Mn 3d 和 O 2p 轨道重叠和能量水平.
- 评估压缩和未压缩的Mn2.05Co0.91O4和矿样本的微波吸收性能.
主要成果:
- 拉伸应变增强了Mn3d和O2p轨道重叠,降低了Mn3d能量水平,并增加了裂变.
- 应力Mn2.05Co0.91O4具有7.52GHz带宽 (1.93倍改进) 和-67.47dB的最小反射损失.
- 应变策略在矿中被证明是多功能性的,与未经应变的样本相比,产生1.83倍的带宽.
结论:
- 火诱导的网格拉伸应变是调节电子结构和增强氧化物中微波吸收的有效方法.
- 这种方法为开发先进的功能材料提供了一个多功能平台,在诸如旋电学,催化和半导体等领域.
- 该研究确立了格子应变,电子结构修改和改进材料性能之间的明确联系.
相关概念视频
Measurements of Strain
2.5K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.5K
True Stress and True Strain
773
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
773
Design Example: Strain Gauge Bridge or Wheatstone Bridge
937
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
937
Three-Dimensional Analysis of Strain
575
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
575
Strain Energy
892
Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
892
Strain and Elastic Modulus
8.8K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
8.8K


