高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 295.

• Chemistry in Materials Sciences • 上一篇    下一篇

Preparation of Ultrafine Ceramic Powder Used for Making PTCR Ceramics by Sol-gel Method

LI Dong-Sheng1, WU Shu-Rong2, XONG Wei-Miao2, WANG Wen-Liang1, WANG Ji-Wu1   

  1. 1. Dept, of Chem. and Chem. Engng., Provincial Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yan'an 716000;
    2. Dept, of Chem., Northwest University, Xi'an 710069
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 基金资助:

    This Project was Supported by Shaanxi Provincial Natural Science Foundation and the Special Scientific Research Foundation of Shaanxi Provincial Education Commission.

Preparation of Ultrafine Ceramic Powder Used for Making PTCR Ceramics by Sol-gel Method

LI Dong-Sheng1, WU Shu-Rong2, XONG Wei-Miao2, WANG Wen-Liang1, WANG Ji-Wu1   

  1. 1. Dept, of Chem. and Chem. Engng., Provincial Key Laboratory of Chemical Reaction Engineering, Yan'an University, Yan'an 716000;
    2. Dept, of Chem., Northwest University, Xi'an 710069
  • Online:2000-12-31 Published:2000-12-31
  • Supported by:

    This Project was Supported by Shaanxi Provincial Natural Science Foundation and the Special Scientific Research Foundation of Shaanxi Provincial Education Commission.

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摘要：

Amorphous gel powder containing Ba, Sr, Ca, Ti, Si, Mn, Li and Y elements has been prepared by a modified sol-gel method, the ultrafine PTCR (Positive Temperature Coefficient of Resistance) powder was obtained through calcination for 2 h at 800℃ in air. According to XRD, DSC, BET and SEM. it can be concluded that it's crystal structure is cubical perovskite phase at room temperature, it's average crystallite size is about 28.4nm (using the Debye-Scherrer formula) or about 40 nm (using BET) or about 50nm(using SEM), it's specific surface area is 24.80 m2/g, and which is two twice as much as that of the sample prepared by old sol-gel method[l,2], it's particle size displays normal distribution with average particle size of 437.2nm.

Abstract:

Amorphous gel powder containing Ba, Sr, Ca, Ti, Si, Mn, Li and Y elements has been prepared by a modified sol-gel method, the ultrafine PTCR (Positive Temperature Coefficient of Resistance) powder was obtained through calcination for 2 h at 800℃ in air. According to XRD, DSC, BET and SEM. it can be concluded that it's crystal structure is cubical perovskite phase at room temperature, it's average crystallite size is about 28.4nm (using the Debye-Scherrer formula) or about 40 nm (using BET) or about 50nm(using SEM), it's specific surface area is 24.80 m2/g, and which is two twice as much as that of the sample prepared by old sol-gel method[l,2], it's particle size displays normal distribution with average particle size of 437.2nm.

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