Zn缺位对Ba(Co0.6Zn0.4)1/3Nb2/3O3陶瓷性能的影响
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中央高校基本科研业务费专项基金资助项目(ZYGX2012J035)

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The Effects of Zn Deficiency on Microwave Dielectric Properties of Ba(Co0.6Zn0.4)1/3Nb2/3O3 Ceramics
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    摘要:

    采用传统固相反应法制备了Ba(Co0.58Y0.02Zn0.4-x)1/3Nb2/3O3(x=0,0.01,0.02,0.03,0.04,0.06)陶瓷,系统研究了Zn缺位对陶瓷的物相组成、微观结构和微波介电性能的影响。X线衍射(XRD)结果表明所有配方陶瓷的主晶相均为BaZn0.33Nb0.67O3Ba3CoNb2O9(BCZN),并存在不同量的第二相Ba8CoNb6O24,适量的Zn缺位可提高BCZN体系的有序度,x=0.02时,其有序度最大。电镜扫描(SEM)结果表明适量的Zn缺位可促进烧结致密化,但Zn缺位过多,会使第二相增多,陶瓷的致密度恶化。随着x的增加,陶瓷的介电常数(εr)基本不变,但品质因数与频率的乘积(Q×f)得到了有效的改善,谐振频率温度系数(τf)先减小后增大。当x=0.02时,BCZN体系陶瓷的εr=35.12,Q×f=52 678 GHz,τf=3.28×10-6/℃。

    Abstract:

    The effects of Zn deficiency on the microwave dielectric properties of Ba(Co0.6Zn0.4-x)1/3Nb2/3O3(x=0~0.06) ceramics prepared by the conventional solidstate route technique were investigated in this paper.The X-ray diffraction(XRD) results presented that all the well sintered samples exhibited the main phase of BaZn0.33Nb0.67O3-Ba3CoNb2O9 and a certain amount of Ba8CoNb6O24 second phase.Appropriate Zn deficiency content was found to increase the cation ordering degree, which reached maximum when x is 0.02.Then the SEM pictures shown that the ceramics with appropriate Zn deficiency content demonstrated a dense microstructure,while the density of the ceramics decreased with excessive Zn deficiency because of the secondary phase Ba8CoNb6O24.Although the εr almost kept unchanged, appropriate Zn deficiency content would also greatly improve the Q×fvalue; meanwhile, the τf value first decreased and then slightly increased with increasing of x.At last,the relative good microwave dielectric properties ( εr=35.21,Q×f=52 678 GHz,τf=3.28×10-6/℃) were obtained for x=0.02.

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张玉芹,周晓华,杨新石,孙成礼,张树人. Zn缺位对Ba(Co0.6Zn0.4)1/3Nb2/3O3陶瓷性能的影响[J].压电与声光,2016,38(1):130-133. ZHANG Yuqin, ZHOU Xiaohua, YANG Xinshi, SUN Chengli, ZHANG Shuren. The Effects of Zn Deficiency on Microwave Dielectric Properties of Ba(Co0.6Zn0.4)1/3Nb2/3O3 Ceramics[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2016-02-25
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