王 典，谢光远，吕俊涛，李湾湾

武汉科技大学 材料与冶金学院，湖北武汉430081

引用格式：

王典， 谢光远， 吕俊涛， 等. 共沉淀法对yYCr_xMn_1-xO₃-（1-y）Y₂O₃体系特征值的影响［J］. 中国粉体技术， 2025， 31（2）： 105-111.

WANG Dian， XIE Guangyuan， LV Juntao， et al. Effect of co-precipitation method on characteristic values of yYCr_xMn_1-xO₃-（1-y） Y₂O₃ system［J］. China Powder Science and Technology， 2025， 31（2）： 105-111.

DOI：10.13732/j.issn.1008-5548.2025.02.009

摘要： 【目的】 通过调控Cr、Mn原子的掺杂比（x）和YCr_xMn_1-xO₃相的物质的量比（y），研究共沉淀法对yYCr_xMn_1-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组（x=0.3，y=0.6），在此基础上，对yYCr_0.3Mn_0.7O₃-（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yYCr_0.3Mn_0.7O₃-（1-y）Y₂O₃体系中，当y≥0.6时，热敏常数为B_25/85≥2 180 K，活化能为E_a≥0.19 eV。通过增加Mn⁴⁺的质量分数，降低Y₂O₃的质量分数，可以增加YCr_0.3Mn_0.7O₃相，提高电阻对温度改变的敏感度，即热敏常数B。【结论】在共沉淀法制备的yYCr_0.3Mn_0.7O₃-（1-y）Y₂O₃体系中，通过调控x和y，可以降低材料的电阻率。

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 yYCrxMn_1-xO₃-（1-y）Y₂O₃ system by adjusting the x and y ratios.

Methods Initially，during the preparation stage of the solid-phase method， eight different ratios of x and y were precisely selected to prepare rare-earth perovskite negative temperature coefficient thermistor （NTC） samples according to the yYCr_xMn_1-x O₃-（1-y）Y₂O₃ system. The raw materials Y₂O₃， Cr₂O₃， and MnCO₃ were accurately weighed according to each ratio. After steps such as grinding and mixing， they were pressed into shape and then sintered in a high-temperature furnace under specific temperature and time conditions. Subsequently， the crystal structure and phase composition of the samples were analyzed using X ray diffraction （XRD） technology. Meanwhile， electrical performance analysis was carried out to comprehensively evaluate parameters such as the direct current resistivity， thermistor constant B_25/85， and activation energy E_a of the samples. After careful comparison， the optimal ratio （x=0.3， y=0.6） was finally selected. On this basis， the chemical co-precipitation method was adopted. YCl₃·6H₂O， CrCl₃·6H₂O， and MnCl₂·4H₂O were calculated， weighed， and batched according to a total mass of 100 g. They were dissolved in 5 mL of deionized water and continuously stirred. In a reverse addition manner， the solution was added to ammonia water and continuously stirred， keeping the pH of the solution at around 10. After stirring for 2 h， the solution was allowed to stand for precipitation. The supernatant was poured off， and the precipitate was washed with deionized water until neutral and then rinsed with absolute ethanol. After drying， it was presintered at 800 ℃ for 2 h. According to the masses of YCr_0.3 Mn_0.7O₃ and Y₂O₃ corresponding to different y values， they were weighed， ground evenly， pressed into small round pieces of specific specifications， and sintered at 1 250 ℃ for 4 h to obtain negative temperature coefficient thermistor ceramics. Through the study of the properties of these ceramics， the influence of the co-precipitation method on the product performance was deeply explored.

Results and Discussion In the yYCr_0.3Mn_0.7O₃-（1-y）Y₂O₃ system prepared by the co-precipitation method， when y≥0.6， the thermal sensitivity constant B_25/85 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 yYCr_0.3Mn_0.7O₃-（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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