摘要
采用化学共沉淀法制备（Ｓｒ，Ｐｂ）ＴｉＯ３粉末，分析了共沉淀产物的热分解过程，确定了结晶温度，同时，标定了材料的晶体结构并计算了晶胞参数，得出了（Ｓｒ，Ｐｂ）ＴｉＯ３铁电体的四方相向立方相转变的温度（Ｃｕｒｉｅ温度）、晶胞参数等一系列随Ｐｂ／Ｓｒ比变化的性质。在（Ｓｒ，Ｐｂ）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。
The(Sr,Pb)TiO 3 powder of different Pb/Sr ratios was prepared by chemical coprecipitation process.The thermolysis process of the coprecipitates(Sr 1-x Pb x)TiO(C 2O 4) 2·4H 2O was analyzed and the crystallization temperature was determined.The crystal structure of sintered bodies and powder calcined at different temperatures were also determined.Their unit cell parameters were calculated.The relationship of the ferroelectric Curie temperature,the unit cell parameters and Pb/Sr ratio was discussed.An unusual structure with fine grain was observed,that is,when the particle size is very small,the crystal structure is not the normal tetragonal system but cubic paraelectric.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1997年第5期547-553,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
铁电体
钛酸锶铅陶瓷
陶瓷半导体
strontiumlead titanate,strontiumlead titanyl oxalate,chemical coprecipitation process,ferroelectrics,crystallization temperature,Curie temperature,lattice constant
