High-temperature negative temperature coefficient (NTC) property and mechanism of high-entropy (La0.2Nd0.2Sm0.2Eu0.2Yb0.2)2Sn2O7 pyrochlore ceramics

IF 3.2 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry Pub Date : 2025-06-09 DOI:10.1016/j.jssc.2025.125479

Ran Li, Yaoning Bai, Zhewei Zheng, Huiming Ji

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引用次数: 0

Abstract

In this study, (La_0.2Nd_0.2Sm_0.2Eu_0.2Yb_0.2)₂Sn₂O₇ high-entropy oxide ceramics with single pyrochlore phase structure were synthesized by high-temperature solid-state reactions, and their high-temperature electrical properties were investigated. High-entropy ceramics with single pyrochlore phase were prepared at sintering temperatures of 1400 °C–1600 °C. The grain size and relative density of high-entropy ceramics increase with the increase of sintering temperatures. High-entropy ceramics exhibit excellent negative temperature coefficient (NTC) performance in the temperature range of 900–1350 °C. The conductive mechanism of high-entropy ceramics which have high electrical resistivity and high activation energy is oxygen vacancies and oxygen ions migration mechanism. Due to their excellent temperature stability and sensitivity, the high-entropy pyrochlore phase ceramics are suitable for temperature monitoring applications in high-temperature environments.

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高熵（La0.2Nd0.2Sm0.2Eu0.2Yb0.2）2Sn2O7焦绿石陶瓷高温负温度系数（NTC）性质及机理

采用高温固相法合成了具有单一焦绿盐相结构的（La0.2Nd0.2Sm0.2Eu0.2Yb0.2）2Sn2O7高熵氧化物陶瓷，并对其高温电学性能进行了研究。在1400℃~ 1600℃的烧结温度下制备了具有单焦绿石相的高熵陶瓷。随着烧结温度的升高，高熵陶瓷的晶粒尺寸和相对密度增大。高熵陶瓷在900 ~ 1350℃的温度范围内表现出优异的负温度系数（NTC）性能。具有高电阻率和高活化能的高熵陶瓷的导电机制是氧空位和氧离子迁移机制。由于其优异的温度稳定性和灵敏度，高熵焦绿石相陶瓷适用于高温环境下的温度监测应用。

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来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.