Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第6期    总第159期    2012年6月

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文章编号:1004-0609(2012)06-1711-07
添加KNN和BBS对BaTiO3陶瓷微结构和介电性能的影响
陈国华1, 2,杨  云1, 2,王丽娜1,孙乾坤1,袁昌来1, 2,江民红1, 2

(1. 桂林电子科技大学 材料科学与工程学院,桂林 541004;
2. 桂林电子科技大学 广西信息材料重点实验室,桂林 541004
)

摘 要: 采用固相法制备添加K0.5Na0.5NbO3(KNN)和BBS玻璃(BBS)的BaTiO3电容器陶瓷。借助X射线衍射仪、扫描电镜和阻抗分析仪研究掺杂对晶体结构、微观组织及介电性能的影响。结果表明:单独添加KNN的样品呈单一的钙钛矿结构。随KNN的增加,陶瓷样品高温端的电容变化率减小。掺杂3%~5%KNN(摩尔分数)陶瓷满足X7R特性。掺杂1%BBS(质量分数)对含3%KNN(摩尔分数)陶瓷的晶体结构无影响。BBS超过3%(质量分数)时,有第二相Bi4B2O9和BaTi5O11生成。1 100 ℃烧结掺杂3%BBS(质量分数)和1%KNN(摩尔分数)的BaTiO3陶瓷具有中等介电常数(1 045),低的介电损耗(0.74%)和较高的体积电阻率(5.5×1011 Ω∙cm),在−55、125和150 ℃的电容变化率分别为−6.6%、−1.7%和−13.2%,有望用于中温制备的X8R型多层陶瓷电容器。

 

关键字: 钛酸钡;掺杂;微结构;介电性能;多层陶瓷电容器

Effects of adding KNN and BBS glass on microstructure and dielectric properties of BaTiO3 ceramics
CHEN Guo-hua1, 2, YANG Yun1, 2, WANG Li-na1, SUN Qian-kun1, YUAN Chang-lai1, 2, JIANG Min-hong1, 2

1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China

Abstract:BaTiO3 (BT) capacitor ceramics with K0.5Na0.5NbO3 (KNN) and BBS glass (BBS) were prepared by the solid state reaction route. The effects of doping KNN and BBS on the crystal structure, microstructure and dielectric properties were investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and impedance analyzer. The results show that KNN-doped BT ceramics exhibit pure perovskite structure. ∆C/C25 values at high temperature obviously decrease with increasing KNN content. 3%−5% (mole fraction) KNN-doped BT ceramics are satisfied with the EIA X7R specification. Adding 1% (mass fraction) BBS and 3% (mole fraction) KNN have no effect on the crystal structure of BT ceramic. However, the secondary phases, Bi4B2O9 and BaTi5O11, occur when BSS content is more than 3% (mass fraction). BT ceramic sample with 3%BBS (mass fraction) and 1%KNN (mole fraction) sintered at 1 100 ℃ shows medium dielectric constant (1 045), low dielectric loss (0.74%), high volume resistivity (5.5×1011 Ω∙cm). The variation of dielectric permittivity for BT-KNN ceramic compared with room temperature is about −6.6% at −55 ℃, −1.7% at 125 ℃ and −13.2% at 150 ℃. The as-prepared ceramic material has great potential as X8R multilayer ceramic capacitors at intermediate temperature.

 

Key words: barium titanate; doping; microstructure; dielectric properties; multilayer ceramic capacitor

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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