The influence of calcination temperature on the PTCR effect in (Ba x-0.002Sm0.002) TiO3 ceramics prepared by the reduction sintering-reoxidation method

1st International Conference on Frontiers of Materials Synthesis and Processing

材料科学;化学

Yang, Meiying^1,3 ; Cheng, Xuxin^2 ; Chen, Haishen^1

School of Physical Science and Technology, Guangxi Normal University, Yucai Road 15, Guilin

541004, China^1

School of Electronic and Electrical Engineering, Zhaoqing University, Zhaoqing Road, Zhaoqing

526061, China^2

Chengnan Primary School, Chongzuo

532200, China^3

关键词: Calcination temperature;    Orders of magnitude;    Positive temperature coefficient of resistivities;    PTCR effects;    Re-oxidation;    Reducing atmosphere;    Reduction-sintering;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/274/1/012126/pdf
DOI  :  10.1088/1757-899X/274/1/012126

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We investigate the effect of calcination temperature on the positive temperature coefficient of resistivity (PTCR) characteristics in (Bax-0.002Sm0.002)TiO3ceramics that were fired at 1250 °C for 30 min in a reducing atmosphere and reoxidized at 800 °C for 1 h in air. The results indicate that the roomerature resistivity first decreased and then increased as calcination temperature increased from 1000 °C to 1200 °C. Moreover, the critical calcination temperature of 1150 °C is experimentally determined. The samples have a low roomerature resistivity of 38.4 •cm and exhibit a significant PTCR effect with a resistance jump of 2.1 orders of magnitude. Furthermore, the roomerature resistivity of the S7 samples doped with a small amount of Mn(NO3)2is much higher than that of the S3 specimens not doped with Mn(NO3)2in our work.