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Published on: November 27, 2015
Bismuth trioxide-tailored sintering temperature, microstructure and NTCR characteristics of Mn1.1Co1.5Fe0.4O4
Bing Wang1,2, Junhua Wang1,2, Aimin Chang1,2
1Key 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 yaojc@ms.xjb.ac.cn.
Abstract:
Mn1.1Co1.5Fe0.4O4 ceramics with tailored sintering temperature, microstructure, and NTCR characteristics were prepared using Bi2O3 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 Bi2O3 additive. The resistivity decreases first and then increases with increasing Bi2O3 content. The obtained B 25/50 value and ρ 25 ranges were 3647-3697 K, and 800-1075 Ω cm, respectively. Oxygen sorption theory can be used to illustrate the optimal thermal stability (ΔR/R 0 = 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.
