首页|Ba/Fe双掺LaCoO3热敏陶瓷材料低温离子传输机制研究

Ba/Fe双掺LaCoO3热敏陶瓷材料低温离子传输机制研究

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为了开发电学性能优异的深低温材料,采用传统高温固态法制备了Ba/Fe双掺杂的LaCoO3负温度系数热敏陶瓷材料,结合XRD、SEM、XPS等测试手段,研究了材料的物相结构、微观形貌、离子价态分布等,并在22-80 K和80-290 K范围内进行了低温电学性能测试.结果表明:双掺杂改性降低了LaCoO3材料的应用温区,ρ(22 K)在1.85×105-6.94×106 Ω·cm范围内变化,材料常数B(22-100 K)在146.09-162.75 K范围内变化;在深低温环境下,材料的导电机理由80 K以上时的小极化子跳跃导电转变为80 K以下时的双交换导电,导致了材料常数B发生突变.由此证明,该双掺杂热敏陶瓷材料在极低温测试中具有可开发的应用潜力.
Research on the Low-Temperature Ion Transport Mechanism of Ba/Fe Co-doped LaCoO3 Thermosensitive Ceramic Materials
The development of deep and low-temperature materials with excellent electrical properties is of great significance to deep space exploration and other fields.In this study,Ba/Fe co-doped LaCoO3 thermal sensitive ceramic material with negative temperature coefficient was prepared by traditional high temperature solid-state reaction method.The phase structure,microscopic morphology and ion valence distribution of the material were investigated by XRD,SEM,and XPS.The low-temperature electrical properties of LaCoO3 were tested in the range of 22-80 K and 80-290 K.The results show that the temperature range of the LaCoO3 material is reduced by co-doping modification.The ρ(22 K)is in the range of 1.85×105-6.94×106 Ω·cm,and the material constant B(22-100 K)is in the range of 146.09-162.75 K.In the deep and low-temperature environment,the conductive mechanism of the material changes from small polaron jump conduction above 80 K to double exchange conduction below 80 K,resulting in the abrupt change of the material constant B.The material system has potential application in the field of extreme low-temperature testing.

low temperature thermistorNTC ceramicselectrical propertiesLa1-xBaxCo1-yFeyO3transport mechanismhigh temperature solid-state reaction methodconductive mechanismlow-temperature ion

丁宇宁、张惠敏、潘叶、谢俊涛、荣景豪

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新疆大学,新疆 乌鲁木齐 830046

中国科学院新疆理化技术研究所,新疆 乌鲁木齐 830011

中国科学院大学,北京 100049

中科传感(佛山)科技有限公司,广东 佛山 528200

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低温热敏电阻 NTC陶瓷 电学性能 La1-xBaxCo1-yFeyO3 传输机制 高温固态法 导电机理 低温离子

新疆维吾尔自治区重点研发计划

2021B01001-2

2024

10.20038/j.cnki.mra.2024.000103

材料研究与应用
广州有色金属研究院

材料研究与应用

影响因子：0.349
ISSN：1673-9981
年,卷(期)：2024.18(1)
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