DOI:10.13732/j.issn.1008-5548.2025.02.009
收稿日期:2023-12-07,修回日期:2024-05-13,上线日期:2025-02-25。
基金项目:国家自然科学基金项目,编号:51904213。
第一作者简介:王典(1999—),女,硕士生,研究方向为热敏陶瓷传感器的工艺设计。E-mail:2876136728@qq. com。
通信作者简介:谢光远(1965—),男,教授,博士,硕士生导师,研究方向为传感器的开发。E-mail:121521197@qq. com。
摘要: 【目的】 通过调控Cr、Mn原子的掺杂比(x)和YCrxMn1-xO3相的摩尔比(y),研究共沉淀法对yYCrxMn1-xO3-(1-y)Y2O3体系产物特征值的影响。【方法】 采用固相法制备8组不同x、y配比的稀土钙钛矿负温度系数(negative temperature coefficient, NTC)热敏电阻,通过X射线衍射(X⁃ray diffraction , XRD)和电性能分析粗选出性能较优异的一组(x=0.3,y=0.6),在此基础上,对yYCr0.3Mn0.7O3-(1-y)Y2O3体系用化学共沉淀法制备4组不同y值的粒度更小、均匀性更高的粉体,通过煅烧压片得到NTC陶瓷,探讨共沉淀法对产物性能的影响。【结果】 在共沉淀法制备的yYCr0.3Mn0.7O3-(1-y)Y2O3体系中,当y≥0.6时,热敏常数为B25/85≥2 180 K,活化能为Ea≥0.19 eV。【结论】 通过增加Mn4+的质量分数,降低Y2O3的质量分数,可以增加YCr0.3Mn0.7O3相,降低材料的电阻率,提高电阻对温度改变的敏感度,即热敏常数B值。
关键词: 化学共沉淀法; 热敏常数; 固相法; 热敏陶瓷; 钙钛矿
Abstract
Objective Negative temperature coefficient (NTC) thermistors are widely used in fields such as automotive electronics, household appliances, aerospace, and medical equipment due to their ability to measure temperature, provide temperature compensation, and suppress inrush current. To enhance the resistivity (ρ) and reduce the thermal sensitivity constant (B) of ceramic NTCs, this study investigates the effect of the co-precipitation method on the characteristic values of the yYCrxMn1-xO3-(1-y)Y2O3 system by adjusting the x and y ratios.
Methods Initially, eight different x and y ratios of rare earth perovskite NTCs were prepared using the solid-phase method. X-ray diffraction (XRD) and electrical performance analysis were used to select the optimal set (x=0.3, y=0.6). Based on this, four groups of powders with smaller particle sizes and higher uniformity were prepared for the yYCr0.3Mn0.7O3-(1-y)Y2O3 system using the chemical co-precipitation method. NTC ceramics were obtained through calcination and pressing, and the effects of the co-precipitation method on the performance of the products were examined.
Results and Discussion In the yYCr0.3Mn0.7O3-(1-y)Y2O3 system prepared by the co-precipitation method, when y≥0.6, the thermal sensitivity constant B25/85 was ≥2180 K, and the activation energy Ea was ≥0.19 eV. Conclusion By increasing the mass fraction of Mn4+ and decreasing the mass fraction of Y2O3, the yYCr0.3Mn0.7O3-(1-y)Y2O3 phase content can be increased, thereby reducing the material’s resistivity. This leads to improved sensitivity of the resistive value to temperature changes, reflected by an increase in the thermal sensitivity constant (B value).
Keywords: chemical co-precipitation method; thermal constant; solid-phase method; thermistor ceramics; perovskite
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