材料科学
陶瓷
微观结构
烧结
复合材料
冶金
多孔性
粒度
热导率
作者
Dongxiang Zhou,Xuxin Cheng,Qiuyun Fu,Shuping Gong,Dongchen Zhao
标识
DOI:10.1016/j.ceramint.2012.05.011
摘要
We investigated the effects of the Sm-dopant content and the cooling rate on the electrical properties and microstructure of Ba1.022� xSmxTiO3 (BST) ceramics, which were sintered at 1200 1C for 30 min in a reducing atmosphere and then reoxidized at 800 1C for 1 h. The results indicated that the cooling rate affected the electrical properties and the microstructure of the BST samples, whose room-temperature resistivity increased with increasing cooling rate. The semiconducting BST ceramics showed a pronounced positive temperature coefficient of resistivity effect, with a resistance jump greater by 3.16 orders of magnitude, along with a low roomtemperature resistivity of 157.4 O cm at a cooling rate of 4 1C/min. The room-temperature resistivity of the specimen was lower after sintering for 30 min at 1150 1C during cooling. & 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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