Effect of crosslinking and field strength on the electrical properties of carbon/polyolefin composites with a large positive temperature coefficient of resistivity

1997 ◽  
Vol 18 (4) ◽  
pp. 484-491 ◽  
Author(s):  
Gengcheng Yang
Keyword(s):  
Electrical Properties ◽  
Field Strength ◽  
Temperature Coefficient ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Temperature Coefficient Of Resistivity

The Positive Temperature Coefficient of Resistivity Effect in (1-x)KNbO3-xBaGeO3 Based Ceramics

2012 ◽  
Vol 476-478 ◽  
pp. 1046-1049
Author(s):  
Tie Zhu Xu ◽  
Xing Wen Zhu ◽  
Min Gong ◽  
Sheng Wei Wang ◽  
Wen Zhong Jiang ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Electrical Properties ◽  
Temperature Coefficient ◽  
Ceramic Materials ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Structural And Electrical Properties ◽  
Ptcr Effect ◽  
Temperature Coefficient Of Resistivity ◽  
Minimum Resistance

(1-x)KNbO3-xBaGeO3 based PTCR ceramic materials are prepared using high purity K2CO3, Nb2O5, GeO2, Al2O3 and BaCO3 powders as starting materials, and the structural and electrical properties have been investigated. The results indicated that the samples doped with minute Ba as donor show excellent PTCR effect above the temperature of about 36°C. For the 0.40at% Ba-doped sample, the minimum resistance of 4.2×104Ω·cm, temperature coefficient (αk) of 24.37%/°C, PTCR anomaly lg(Rmax/Rmin) of 3.82 and transition temperature (Tmin) of 36°C are obtained.

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