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BaTiO_3系PTC半导瓷的热物理性质通常用ρ—T(电阻率—温度)曲线来描述。这种描述大都是“零功率”条件下完成的。对实用的材料而言,尤其作为发热体,使用电压很高。ρ—T曲线已不能充分描述其本征性质。本文提出了用ρ—T—E三维空间定量描述(E为电场强度)。用实验方法分析了常见的若干参量后指出:在材料特性与器件特性混淆的情况下,参量不具有唯一性。因此,不同作者报导的材料参量可比性较差,这就有必要对此种材料建立一个统一的描述方法。本文提出的以ρ—T—E三维空间的曲线族可描述PTC半导瓷本征的宏观电一热性质,且具有唯一性。并给出了表征材料本征特性的若干参量。
The thermophysical properties of BaTiO_3 PTC semiconducting porcelain are usually described by the ρ-T (resistivity-temperature) curve. This description is mostly done under “zero power” conditions. For practical materials, especially as a heating element, the use of high voltage. ρ-T curve has not been able to fully describe its intrinsic properties. This paper presents a quantitative description of the three-dimensional space ρ-T-E (E is the electric field strength). After analyzing some common parameters by experimental methods, it is pointed out that the parameters are not unique when the material characteristics and device characteristics are confused. Therefore, the comparability of material parameters reported by different authors is poor, which makes it necessary to establish a uniform description of the material. The proposed family of ρ-T-E three-dimensional space curves can be used to describe the macroscopic electric-thermal properties of PTC semiconducting porcelain. Some parameters that characterize the intrinsic properties of materials are also given.