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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

(Sr,Pb)TiO3超微粉体的制备和性质

王德君; 周济; 桂治轮; 李龙土   

  1. 清华大学材料科学与工程系; 北京100084
  • 收稿日期:1996-01-08 修回日期:1996-02-05 出版日期:1997-04-20 网络出版日期:1997-04-20

Preparation and Characteristics of (Sr, Pb)TiO3,Ultrafine Particles

WANG Dejun; ZHOU Ji; GUI Zhilun; LI Longtu   

  1. Department of Materials Science and Engineering; Qinghua University Beijing 100084 China
  • Received:1996-01-08 Revised:1996-02-05 Published:1997-04-20 Online:1997-04-20

PDF (PC)

903

摘要： 应用草酸盐共沉淀法制备（Sr，Pb）TiO3超细粉体，分析了共沉淀产物的热分解过程，确定了晶化温度和煅烧条件，同时，测量了粉末的晶粒尺寸，标定了材料的晶体结构，试验了粉体的烧结条件．结果表明，用草酸盐共沉淀法制备陶瓷粉末，合成温度远远低于传统的固相反应合成法，陶瓷粉末晶粒微细、均匀、烧结温度低；在（Sr，Ph）TiO3陶瓷中观测到了小尺寸微晶粒的结构奇异现象，即当粉末微粒尺寸很小时，晶体结构不是通常的四方铁电相结构，而是立方顺电相结构．

关键词: 粉末, 共沉淀法, 结晶化, 钛酸锶铅, 草酸氢钛锶铅

Abstract: The (Sr, Pb)TiO3 ultrafine particles were prepared by oxalate-coprecipitation process, the thermolysisprocess of the coprecipitates (Sr, Pb)TiO(C2O4)2 .4H2O was analyzed and the crystallization temperatureand calcination comdition were defined. The averagc Primary particle size calcined at differenttemperaturcs, the crystal structurcs of sintered body and powders calcilled at different temperatures and thesintering condition of powders were also determined. The results show that the synthetic temperature of ceramic powder prepared by this process is much lower than by the conventional solid reaction process. the ceramic powder obtained is ultrafine and uniform, and the sintering temperature is lower. Exotic structure with fine grain was observed, that is, when the particle size is very small, the crystal structure is not the normal tetragonal ferroelectric structure but cubic paraelectric.

Key words: powders, copreeipitation, crystallization, strontium-lead titanate, strontium-lead titanyloxalate