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Citation: LI Dong-Sheng, WU Shu-Rong, XIONG Wei-Miao, WANG Wen-Liang. An Improved Sol-Gel Method for Preparation of BaTiO₃-based PTCR Ceramic Materials[J]. Chinese Journal of Applied Chemistry, ;2002, 19(10): 932-935. shu

An Improved Sol-Gel Method for Preparation of BaTiO₃-based PTCR Ceramic Materials

1.
a Provincial Key Laboratory of Chemical Reaction Engineering, Department of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000;
2.
b Department of Chemistry, Northwest University, Xi'an;
3.
3. School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an

Corresponding author: LI Dong-Sheng,
Received Date: 5 February 2002
Available Online: 3 July 2002
Fund Project: 陕西省自然科学基金(2000H16) (2000H16)教育厅科研专项基金(00JK133) (00JK133)

The BaTiO₃-based PTCR(Positive Temperature Coefficient Resistant) nanopowder was prepared by a modified sol-gel process. XRD, DSC, SEM and BET techniques were used to investigate the characteristics of the nanopowder and their effects on the properties ceramics thereof. The results showed that the sphere-shaped nanopowder of narrow size distribution has an average crysta llite size of 30~40 nm with specific surface area 26.20 m²/g. Its crystal structure is cubic perovskite phase at room temperature. The nanopowder was pressed into pellets and sintered by an improved technique to fabricate PTCR ceramic materials with much better electrical properties than that reported in the previous paper.
- BaTiO₃,
- positive temperature coefficient resistant,
- sol-gel process,
- nanopowder
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An Improved Sol-Gel Method for Preparation of BaTiO3-based PTCR Ceramic Materials

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通讯作者: 陈斌, bchen63@163.com

An Improved Sol-Gel Method for Preparation of BaTiO₃-based PTCR Ceramic Materials