热敏陶瓷材料Mn2.25-xNi0.75CoxO4微结构与电学性能研究

doi:10.3724/SP.J.1077.2011.01037

无机材料学报 ›› 2011, Vol. 26 ›› Issue (10): 1037-1042.DOI: 10.3724/SP.J.1077.2011.01037

热敏陶瓷材料Mn_2.25-xNi_0.75Co_xO₄微结构与电学性能研究

彭昌文^1,2,3, 张惠敏^1,2, 常爱民^1,2, 黄霞^1,2,3, 姚金城^1,2,3

(1. 中国科学院新疆理化技术研究所, 乌鲁木齐830011; 2. 新疆电子信息材料与器件重点实验室, 乌鲁木齐830011; 3. 中国科学院研究生院, 北京100049)

收稿日期:2010-11-18 修回日期:2011-01-04 出版日期:2011-10-20 网络出版日期:2011-09-20
作者简介:彭昌文(1986-), 男, 硕士研究生. E-mail: pengchangwen1986@163.com
基金资助:
国家自然科学基金(50902148); 中科院“西部之光”(RCPY200901)

Microstructure and Electrical Properties of Mn_2.25-xNi_0.75Co_xO₄Thermistor Ceramics

PENG Chang-Wen^1,2,3, ZHANG Hui-Min^1,2, CHANG Ai-Min^1,2, HUANG Xia^1,2,3, YAO Jin-Cheng^1,2,3

(1. Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China; 2. Xinjiang Key Laboratory of Electronic Information Materials and Devices, Urumqi 830011, China; 3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China)

Received:2010-11-18 Revised:2011-01-04 Published:2011-10-20 Online:2011-09-20
Supported by:
National Natural Science Foundation of China (50902148); Western Light Foundation of Chinese Academy of Sciences (RCPY200901)

摘要/Abstract

摘要： 采用氧化物固相法制备Mn_2.25-xNi_0.75Co_xO₄(0.8≤x≤1.2)系列NTC(negative temperature coefficient)热敏电阻粉体材料. 利用激光粒度分析、XRD、SEM和电性能测试等手段, 表征了煅烧材料的颗粒尺寸、陶瓷体的物相、形貌以及陶瓷材料的电学特性与Co含量的关系. 结果表明: 在1130~1230℃烧结温度范围内, 该材料体系的B值和电阻率ρ25℃随Co含量的变化范围分别为3487~4455 K和1998~203617 Ω·cm, B值和电阻率随Co含量的增加先增大后减小. 该材料系列电阻率和B值调整范围较大, 是一种具有实际应用价值的NTC热敏电阻.

关键词: NTC热敏陶瓷, 尖晶石, 电性能

Abstract: A series of composite of the negative temperature coefficient (NTC) powders of Mn_2.25-xNi_0.75Co_xO₄(0.8≤x≤1.2) materials were prepared via solid-state method. The particle size of calcined powders, ceramics phase structure, morphology and electrical properties were characterized by laser particle size analyzer, XRD, SEM and electrical measurements, respectively. The results show that when the Mn_2.25-xNi_0.75Co_xO₄ceramics sintered at 1130-1230℃, their characteristic parameters B25/50 value are found to be in the range of 3487K to 4455K and their electrical resistivities ρ25℃ are 1998 Ω·cm to 203617 Ω·cm. The B25/50 value and ρ25℃ first increases and then decreases as the Co content increases. This means that electrical resistivity and B value of Mn_2.25-xNi_0.75Co_xO₄ceramics could be adjusted to the desired values and this ternary system can be considered as the advanced semi-conducting materials for NTC thermistor applications.

Key words: NTC thermistor ceramic, spinel, electrical property

中图分类号:

TQ174

彭昌文, 张惠敏, 常爱民, 黄霞, 姚金城. 热敏陶瓷材料Mn_2.25-xNi_0.75Co_xO₄微结构与电学性能研究[J]. 无机材料学报, 2011, 26(10): 1037-1042.

PENG Chang-Wen, ZHANG Hui-Min, CHANG Ai-Min, HUANG Xia, YAO Jin-Cheng. Microstructure and Electrical Properties of Mn_2.25-xNi_0.75Co_xO₄Thermistor Ceramics[J]. Journal of Inorganic Materials, 2011, 26(10): 1037-1042.

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热敏陶瓷材料Mn_2.25-xNi_0.75Co_xO₄微结构与电学性能研究

Microstructure and Electrical Properties of Mn_2.25-xNi_0.75Co_xO₄Thermistor Ceramics

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