BST-BT_(4/13)复合陶瓷介电调谐性能的研究
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摘要
通过固相反应法制备了高介电相含量和高温度稳定性的介电可调Ba_(0.6)Sr_(0.4)TiO_3-Ba_4Ti_(13)O_(30)(BSTBT_(4/13))复合陶瓷,研究了介电相BT_(4/13)含量和烧结温度对其显微结构、介电性能和调谐性能的影响。结果表明,BT_(4/13)含量的增加有利于BST-BT_(4/13)复合陶瓷烧结性能的提高、介电常数的下降及其温度稳定性的增强,但会降低其调谐率。随着烧结温度的升高BST-BT_(4/13)复合陶瓷的介电常数增大。当BT_(4/13)相的体积分数高达92%时,BSTBT_(4/13)复合陶瓷在20～160℃内具有优异的温度稳定性及其介电常数在20～65℃之间几乎不变,且表现出明显的介电非线性,在10kV/cm的直流偏置场强下调谐率仍可达1%。
The dielectric tunable Ba_(0.6)Sr_(0.4)TiO_3-Ba_4Ti_(13)O_(30)(BST-BT_(4/13))composite ceramics with high dielectric phase contents and good temperature stability have been prepared by the solid-state reaction method.The effects of Ba_4Ti_(13)O_(30) contents and sintering temperatures on the microstructure,dielectric and tuning properties were investigated.Results show that the increase of BT_(4/13) content is beneficial to the improvement of sintering properties,the decrease of dielectric constant and the enhancement of temperature stability of BST-BT_(4/13) composite ceramics,but it will reduce the tuning rate of BST-BT_(4/13) composite ceramics.With the increase of sintering temperature,the dielectric constant of BST-BT_(4/13) composite ceramics increases.As the volume fraction of BT_(4/13) phase reaches as high as92%,the BST-BT_(4/13) composite ceramics have excellent temperature stability at 20～160 ℃ and its dielectric constant maintains almost unchanged at 20～65℃,and still exhibits obvious dielectric nonlinearity with the tunability of 1% at a DC bias field strength of 10kV/cm.
The dielectric tunable Ba_(0.6)Sr_(0.4)TiO_3-Ba_4Ti_(13)O_(30)(BST-BT_(4/13))composite ceramics with high dielectric phase contents and good temperature stability have been prepared by the solid-state reaction method.The effects of Ba_4Ti_(13)O_(30) contents and sintering temperatures on the microstructure,dielectric and tuning properties were investigated.Results show that the increase of BT_(4/13) content is beneficial to the improvement of sintering properties,the decrease of dielectric constant and the enhancement of temperature stability of BST-BT_(4/13) composite ceramics,but it will reduce the tuning rate of BST-BT_(4/13) composite ceramics.With the increase of sintering temperature,the dielectric constant of BST-BT_(4/13) composite ceramics increases.As the volume fraction of BT_(4/13) phase reaches as high as92%,the BST-BT_(4/13) composite ceramics have excellent temperature stability at 20～160 ℃ and its dielectric constant maintains almost unchanged at 20～65℃,and still exhibits obvious dielectric nonlinearity with the tunability of 1% at a DC bias field strength of 10kV/cm.
引文
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[2]NENASHEVA E A,KANAREYKIN A D,KARTEN-KO N F,et al.Ceramics materials based on(Ba,Sr)TiO3,solid solutions for tunable microwave devices[J].Journal of Electroceramics,2004,13(1/3):235-238.
[3]ZHANG Jingji,JI Ludong,JIA Xuanrui,et al.Crystal structure and effective dielectric response of Ba0.5Sr0.5TiO3-MgO composites synthesized in situ process[J].Journal of the American Ceramic Society,2015,98(1):97-103.
[4]CHOU Xiujian,ZHAIi Jiwei,YAO Xi.Dielectric tunable properties of low dielectric constant Ba0.5Sr0.5TiO3-Mg2TiO4 microwave composite ceramics[J].Applied Physics Letters,2007,91(12):5.
[5]CHEN Ying,DONG Xianlin,LIANG Ruihong,et al.Dielectric properties of Ba0.6Sr0.4TiO3/Mg2SiO4/MgOcomposite ceramics[J].Journal of Applied Physics,2005,98(6):909.
[6]ZHANG Qiwei,ZHAI Jiwei,YAO Xi.Dielectric and percolative properties of Ba0.5Sr0.5TiO3-Mg3B2O6composite ceramics[J].Journal of the American Ceramic Society,2011,94(4):1138-1142.
[7]ZHOU K,BOGGS S A,RAMPRASAD R,et al.Dielectric response and tunability of a dielectric-paraelectric composite[J].Applied Physics Letters,2008,93(10):102908-102908-3.
[8]WU Shunhua,WANG Guoqing,ZHAO Yushuang,et al.BaO-TiO2,microwave ceramics[J].Journal of the European Ceramic Society,2003,23(14):2565-2568.
[9]PALATHINKAL T J,CHENG H F,LEE Y C,et al.Low loss tunable thick films Based on(Ba,Sr)TiO3and Ba4Ti13O30 materials[J].Integrated Ferroelectrics,2004,66(1):213-221.
[10]LUBOMIRSKY I,WANG T Y,DEFLAVIIS F,et al.Dielectric relaxation in ceramics with an intragrain concentration gradient[J].Journal of the European Ceramic Society,2002,22(8):1263-1267.
[11]DONG Hangting,JIN Dengren,XIE Chaojun,et al.Compositionally inhomogeneous Ti-excess barium strontium titanate ceramics with a robust dielectric temperature stability[J].Materials Letters,2014,135(10):83-86.
[12]ZHAO Zhe,BUSCAGLIA V,VIVIANI M,et al.Grain-size effects on the ferroelectric behavior of dense nanocrystalline BaTiO3[J].Physical Review B Condensed Matter,2004,70(2):2199-2208.
[13]HORNEBECQ V,HUBER C,MAGLIONE M,et al.Dielectric properties of pure(Ba,Sr)TiO3and composites with different grain sizes ranging from the nanometer to the micrometer[J].Advanced Functional Materials,2004,14(9):899-904.
[14]TANG Linjiang,ZHAI Jiwei,ZHANG Haijun,et al.Microwave dielectric properties of tunable Ba0.5Sr0.5TiO3and scheelite AMoO4(A=Ba,Sr)composite ceramics[J].Journal of Alloys&Compounds,2013,551(3):556-561.