Preparation and characterisation of BaTiO₃ based PTC ceramics with high performance

Authors: Jia, J. L.; Zhu, L.; Zhou, W. Y.; Chang, Z. G.; Yang, M. L.

Source: Advances in Applied Ceramics, Volume 108, Number 2, February 2009 , pp. 132-135(4)

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Abstract:

The nanocrystalline BaTiO₃ based PTC powders had been prepared by a simple sol–gel method starting from comparatively cheap raw materials. The powders and ceramics were characterised by thermogravimetry–differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, while electronic properties of the ceramics were also studied. The good material electronic properties were obtained, including a Curie temperature (T_C) of 100°C, a resistivity at room temperature (?_25°C) of 18 ? cm, a high resistivity step ratio (?_max/?_min) of 1·2×10⁶, a temperature coefficient of resistivity (?₃₀) of 17% °C^?1 and a withstand voltage intensity (V_b) of 196 V mm^?1.The nanocrystalline BaTiO₃ based PTC powders had been prepared by a simple sol–gel method starting from comparatively cheap raw materials. The powders and ceramics were characterised by thermogravimetry–differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, while electronic properties of the ceramics were also studied. The good material electronic properties were obtained, including a Curie temperature (T_C) of 100°C, a resistivity at room temperature (?_25°C) of 18 ? cm, a high resistivity step ratio (?_max/?_min) of 1·2×10⁶, a temperature coefficient of resistivity (?₃₀) of 17% °C^?1 and a withstand voltage intensity (V_b) of 196 V mm^?1.

Keywords: HIGH PERFORMANCE; PTC CERAMICS; SOL?GEL METHOD; OVERCURRENT PROTECTION

Document Type: Short Communication

DOI: http://dx.doi.org/10.1179/174367608X319311

Publication date: 2009-02-01

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