Dielectric and ferroelectric properties of Ba1−xSrxTiO3 ceramics: Effects of grain size and ferroelectric domain
Dielectric and ferroelectric properties of Ba1−xSrxTiO3 ceramics: Effects of grain size and ferroelectric domain
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DOI：
10.1179/1743676112y.0000000070
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发表时间：
2013-07
影响因子：
2.2
通讯作者：
Ting Ting Chen-Ting;M. Fu;Bo Wen Jia;Y. Wu;X. Liu;X. Chen
中科院分区：
文献类型：
--
作者：
Ting Ting Chen-Ting;M. Fu;Bo Wen Jia;Y. Wu;X. Liu;X. Chen
采用放电等离子烧结技术和常规烧结工艺制备了Ba1−xSrxTiO3(x=0.3，0.35)陶瓷。同时测定了它们的微观结构、介电性能和铁电性能。SPS样品的颗粒尺寸小于CS样品。差示扫描量热仪数据表明，在SPS烧结陶瓷中几乎没有检测到与相变相关的潜热。拉曼光谱分析表明，四方相随颗粒尺寸的增大而增加，且四方相含量越高，CS烧结样品的介电性能越好。透射电子显微镜分析表明，磁畴结构在很大程度上取决于陶瓷的晶粒度。SPS陶瓷的铁电性能较差是由于四方结构发育不完全所致。
Ba1−xSrxTiO3 (x = 0·3, 0·35) ceramics are fabricated by spark plasma sintering (SPS) technique and conventional sintering (CS) route. Their microstructures are determined together with the dielectric and ferroelectric properties. The grain sizes of SPS samples are smaller than those of CS. The differential scanning calorimetry data show that almost no latent heat associated with phase transition can be detected in the SPS sintered ceramics. Raman spectroscopy analysis suggests that the tetragonal phase increases with increasing the grain size, and the higher content of tetragonal phase leads the superior dielectric properties in CS sintered samples. Transmission electron microscopy analysis indicates that domain structure heavily relies on the grain size of ceramics. The poor ferroelectric properties of SPS ceramics are originated from the incomplete development of the tetragonal structure.