Electrical conductivity and temperature sensitivity of W/F-modified CuO-based ceramics

LI Haozhe; GONG Shuchu; YANG Bao; ZHANG Jia; ZHANG Hong

doi:10.13264/j.cnki.ysjskx.2016.02.010

Volume 7 Issue 2

Apr. 2016

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Nonferrous Metals Science and Engineering > 2016 > 7(2): 54-59. > DOI: 10.13264/j.cnki.ysjskx.2016.02.010

LI Haozhe, GONG Shuchu, YANG Bao, ZHANG Jia, ZHANG Hong. Electrical conductivity and temperature sensitivity of W/F-modified CuO-based ceramics[J]. Nonferrous Metals Science and Engineering, 2016, 7(2): 54-59. DOI: 10.13264/j.cnki.ysjskx.2016.02.010

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Electrical conductivity and temperature sensitivity of W/F-modified CuO-based ceramics

1.
Zhounan High School, Changsha 410005, China
2.
School of Materials Science and Engineering, Central South University, Changsha 410083, China

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Received Date: February 08, 2016
Published Date: April 29, 2016

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Abstract

Abstract

>In order to develop new system of thermal sensitive ceramics with negative temperature coefficient (NTC) of resistivity, W/F modified CuO-based ceramics (Cu_1-yW_yO:F_x, xranges 0.01~0.07 and yranges 0~0.006)were prepared by using a wet-chemical synthesis method. The phase component, microstructure, electrical conductivity and resistivity-temperature characteristics of the ceramics were analyzed by using X-Ray diffraction, scanning electron microscope, resistance-temperature measurement and electrochemical impedance spectrum, respectively. The results show that the room temperature resistivities of the CuO ceramics can be adjusted obviously by doping with F ions, and the W/F-doped CuO ceramics have excellent NTC feature with the highest materials constant of 5084 K. The electrical conductivity and NTC characteristics of the W/F modified CuO ceramics are co-resulted from the grain effect (bulk effect) and grain-boundary effect. Both the band conduction and electron-hopping models are proposed for the conduction mechanisms in the W/F modified CuO ceramics.
- CuO ceramic,
- W/F doping,
- Electrical conductivity,
- Negative temperature coefficient of resistivity,
- Conduction mechanism

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Electrical conductivity and temperature sensitivity of W/F-modified CuO-based ceramics

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