热电功勋值 “ZT ”是一个衡量热电应用材料效率的无量纲量。其定义为：[latex]ZT = \frac{S^2 \sigma T}{\kappa}[/latex]，其中 S 是热电系数。 塞贝克 系数，[latex]\sigma[/latex] 为电导率，T 为绝对温度，[latex]\kappa[/latex] 为热导率。ZT 值越高，表明热电材料的效率越高。.
热电品质因数（ZT）
1950
- Abram Ioffe
（图片仅供参考）
The figure of merit encapsulates the essential properties a material must possess to be effective in thermoelectric energy conversion. The numerator, [latex]S^2 \sigma[/latex], is known as the power factor. A high Seebeck coefficient (S) is needed to generate a large voltage from a given temperature difference, and high electrical conductivity ([latex]\sigma[/latex]) is required to minimize resistive (Joule) heating losses. The denominator, thermal conductivity ([latex]\kappa[/latex]), must be as low as possible. A low [latex]\kappa[/latex] helps maintain a large temperature difference across the device, which is essential for both power generation (Seebeck effect) and cooling (Peltier effect).
The primary challenge in thermoelectric material science is that these properties are often interdependent and conflicting. For instance, materials with high electrical conductivity (like metals) also tend to have high thermal conductivity due to the Wiedemann-Franz law. The quest for high ZT materials has led to advanced strategies like nanostructuring. By creating structures with features on the nanoscale, it is possible to scatter phonons (which carry heat) more effectively than electrons (which carry charge), thereby reducing [latex]kappa[/latex] without significantly harming [latex]sigma[/latex]. This ‘phonon-glass electron-crystal’ concept has led to significant improvements in ZT values over the last few decades.
UNESCO Nomenclature: 2211
- 固体物理学
类型
物理特性
中断
递增
用法
广泛使用
前体
- 塞贝克效应、珀尔帖效应和汤姆森效应的发现
- 固体物理学和半导体理论的发展
- 了解固体中的电和热传输机制
- 维德曼-弗朗兹电导率和热导率定律
应用程序
- 比较不同热电材料性能的基准
- 指导材料科学研究以开发更高效的热电设备
- 工程热电发电机（teg）和冷却器（tecs）的设计参数
- 预测热电装置的最大可能效率
专利：
NA
潜在创新理念
Related to: figure of merit, ZT, thermoelectric efficiency, seebeck coefficient, electrical conductivity, thermal conductivity, material science, power factor, phonon scattering, nanostructuring.
历史背景
热电品质因数（ZT）
（如果日期未知或不相关，例如“流体力学”，则提供其显著出现的近似估计）
