Influence of B3+- and Na+-ions on electrical property and temperature sensitivity of NiO-based ceramics
| Autor: | Bicai Li, Zhicheng Li, Zhenli He, Zefang Yang, Hong Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Thermistor Non-blocking I/O Analytical chemistry Condensed Matter Physics Microstructure Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Electrical resistivity and conductivity visual_art visual_art.visual_art_medium Grain boundary Ceramic Electrical and Electronic Engineering Temperature coefficient |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 30:3088-3097 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-018-00588-z |
| Popis: | For various applications of negative temperature coefficient (NTC) thermistors, it is useful to develop a material system to achieve different room-temperature resistivities (ρ25) and temperature sensitivity (B value) by adjusting slightly the chemical composition. Here, B3+/Na+-modified NiO-based ceramics (denoted as xB/yNa-NiO, 0 ≤ x ≤ 0.04 and 0 ≤ y ≤ 0.07) were prepared for NTC thermistors. The phase component and microstructure of the ceramics were detected respectively by using X-ray diffraction and scanning electron microscope. The related electrical properties and temperature sensitivity were investigated by analyzing the resistivity-temperature characteristic and related complex impedance spectra. The results show that all the prepared ceramics have a cubic crystalline structure and present typical NTC characteristics. By changing the concentrations of B3+- and Na+-ions in the compounds, ρ25 from 47.94 Ω cm to 1.024 MΩ cm and B values from 2582 to 8019 K were achieved. The analysis of complex impedance spectra reveals that both grain effect and grain boundary effect contribute to the electrical conduction and NTC feature. The conduction mechanisms combining with band conduction and polaron hopping model are proposed for the NTC effect in xB/yNa-NiO thermistors. |
| Databáze: | OpenAIRE |
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