This paper presents a novel rare earth-based chromate (LaNdSmEuGd)CrO for high-temperature thermistor applications. X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy tests reveal that the material is a high-entropy ceramic with a perovskite structure, exhibiting a dense microstructure with a relative density of 97.6 %. Electrical analysis shows that (LaNdSmEuGd)CrO exhibits high resistivity at high temperatures but with a material constant of 1,968 K, making it capable of meeting the resistance requirements for commercial thermistors over an ultrawide temperature range of 25 – 1,300 °C. AIMD simulations indicate the excellent structural stability of (LaNdSmEuGd)CrO even at 1,300 °C, suggesting promising high-temperature aging characteristics. Further aging tests demonstrate that its resistance only drifted by 4.57 % after being subjected to 1,300 °C for 1,000 h. The above findings represent breakthroughs in terms of maximum operating temperature, applicable temperature range, aging performance and sintering densification for chromate-based high-temperature thermistor ceramics.

中文翻译：

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高温NTC热敏电阻用高熵铬酸盐（La0.2Nd0.2Sm0.2Eu0.2Gd0.2）CrO3

本文提出了一种用于高温热敏电阻应用的新型稀土基铬酸盐 (LaNdSmEuGd)CrO。 X射线衍射、扫描电子显微镜、能谱和X射线光电子能谱测试表明，该材料是一种具有钙钛矿结构的高熵陶瓷，呈现出致密的微观结构，相对密度为97.6%。电学分析表明，(LaNdSmEuGd)CrO在高温下表现出高电阻率，但材料常数为1,968 K，使其能够满足商用热敏电阻在25 – 1,300 °C超宽温度范围内的电阻要求。 AIMD 模拟表明，即使在 1,300 °C 下，(LaNdSmEuGd)CrO 也具有出色的结构稳定性，这表明其具有良好的高温老化特性。进一步的老化测试表明，在1,300°C下1,000小时后，其电阻仅漂移4.57%。上述发现代表了铬酸盐基高温热敏电阻陶瓷在最高工作温度、适用温度范围、老化性能和烧结致密化方面的突破。