| BST-BZN复相陶瓷的烧结行为和介电性能 |
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| 引用本文： | 李明利,杜丕一,纪松,钱坤明,倪杨. BST-BZN复相陶瓷的烧结行为和介电性能[J]. 兵器材料科学与工程, 2009, 32(6) |
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| 作者姓名： | 李明利 杜丕一 纪松 钱坤明 倪杨 |
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| 作者单位： | 硅材料国家重点实验室,浙江大学,材料科学与工程系,浙江,杭州,310027;中国兵器科学研究院,宁波分院,浙江,宁波,315103;硅材料国家重点实验室,浙江大学,材料科学与工程系,浙江,杭州,310027;中国兵器科学研究院,宁波分院,浙江,宁波,315103 |
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| 摘 要： | 用草酸盐共沉淀工艺制备高反应活性Ba0.6Sr0.4TiO3(BST)粉体,添加10%(质量分数)的Bi2O3·ZnNb2O6(BZN)为烧结助剂,采用传统陶瓷制备工艺制备BST-BZN复相陶瓷。用扫描电镜(SEM)和X射线衍射仪(XRD)分别研究BST-BZN的微观形貌和晶相组成,并测试BST-BZN复相陶瓷的介电性能参数。结果表明,添加BZN使BST的烧结温度由1350℃降低到1050℃,BST晶粒粒径约为1μm,烧结过程BZN与BST发生固溶反应,BST的XRD衍射峰向低角度偏移。BST-BZN具有良好的介电常数温度稳定性,但是由于少量Bi3+对Ba2+/Sr2+的取代、晶粒的细化、晶界相比例增多等原因导致BST-BZN可调率降低,1kV/mm的偏场作用下其可调率只有0.15%。
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| 关 键 词： | 钛酸锶钡 复相陶瓷 微观形貌 介电性能 |
Sintering behavior and dielectric property of BST-BZN composite ceramics |
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| LI Mingli,DU Piyi,JI Song,QIAN Kunming,NI Yang. Sintering behavior and dielectric property of BST-BZN composite ceramics[J]. Ordnance Material Science and Engineering, 2009, 32(6) |
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| Authors: | LI Mingli DU Piyi JI Song QIAN Kunming NI Yang |
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| Abstract: | The barium strontium titanate (Ba_(0.6)Sr_(0.4)TiO_3,BST) powders with high activity were prepared by oxalate co-precipitation method. The barium strontium titanate composites(BST-BZN) doped by 10%(mass fraction) Bi_2O_3·ZnNb_2O_6(BZN) were obtained by traditional solid phase method. Their structures and morphology were characterized by XRD and SEM. Experimental results show that the BST-BZN composites can be sintered at 1 050℃. SEM results showed that the grain size of BST was about 1μm. XRD results showed that the peaks of BST transferred to lower angle since some Nb~(5+) enters BST lattice. BST-BZN composites possess better permittivity-temperature character. However, the tunability of BST-BZN was decreased to 0.15% (measured at 1 kV/mm) due to the substitution of Bi~(3+) to Ba~(2+)/Sr~(2+), the decrease of BST grain size and the increase of grain boundary. |
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| Keywords: | barium strontium titanate composite ceramics microstructure dielectric property |
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