三氧化二铋定制的烧结温度、微观结构及锰钴铁氧体陶瓷的负温度系数热敏电阻特性

Bismuth trioxide-tailored sintering temperature, microstructure and NTCR characteristics of MnCoFeO ceramics.

作者信息

Wang Bing, Wang Junhua, Chang Aimin, Yao Jincheng

机构信息

Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS 40-1 South Beijing Road Urumqi China

University of Chinese Academy of Sciences Beijing 100049 China.

出版信息

RSC Adv. 2019 Aug 15;9(44):25488-25495. doi: 10.1039/c9ra04676c. eCollection 2019 Aug 13.

DOI:10.1039/c9ra04676c

PMID:35530107

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9070020/

Abstract

MnCoFeO ceramics with tailored sintering temperature, microstructure, and NTCR characteristics were prepared using BiO sintering additive by a solid-state reaction route. Densification and morphological characterization indicate that bismuth trioxide can play a critical role in the sintering process. The results reveal that the sintering temperature can be decreased significantly from 1200 °C to 1050 °C by using the appropriate content of BiO additive. The resistivity decreases first and then increases with increasing BiO content. The obtained value and ranges were 3647-3697 K, and 800-1075 Ω cm, respectively. Oxygen sorption theory can be used to illustrate the optimal thermal stability (Δ/ = 0.10%). Complex impedance analysis further elucidates that grain boundaries make a dominant contribution to the total resistance. The mechanisms of grain boundary conduction and relaxation behavior are systematically analyzed. These findings open up a window for the further advancement of NTC ceramics at lower sintering temperature.

摘要

采用固态反应路线，通过添加BiO烧结添加剂制备了具有定制烧结温度、微观结构和负温度系数热敏电阻（NTCR）特性的MnCoFeO陶瓷。致密化和形态表征表明，三氧化二铋在烧结过程中起着关键作用。结果表明，通过使用适当含量的BiO添加剂，烧结温度可从1200℃显著降低至1050℃。随着BiO含量的增加，电阻率先降低后升高。获得的居里温度值和电阻率范围分别为3647 - 3697K和800 - 1075Ω·cm。氧吸附理论可用于解释最佳热稳定性（Δ / = 0.10%）。复阻抗分析进一步阐明，晶界对总电阻起主要作用。系统地分析了晶界传导和弛豫行为的机制。这些发现为在较低烧结温度下进一步推进NTC陶瓷开辟了一扇窗口。