LiF添加对YAG陶瓷微波介电性能的影响
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摘要
采用常规固相烧结法制备了YAG陶瓷,并研究了烧结温度和LiF添加量对YAG陶瓷微观结构和微波介电性能的影响。结果表明,LiF的添加不仅可以有效降低YAG陶瓷的烧结温度,而且显著提高其微波介电性能。当LiF添加量为质量分数5%时,YAG陶瓷经1500℃烧结6 h后的相对密度为97.5%,显微组织较均匀、致密,具有优异的微波介电性能:ε_r=11.3,Q·f=67130 GHz,τ_f=-53.4×10~(-6 )℃~(-1)。当LiF添加量过多时,YAG陶瓷的气孔率增加,Q·f值显著下降。
The YAG ceramics were prepared by the conventional solid-state reaction method. We studied the effects of sintering temperature and LiF addition on the microstructure and microwave dielectric properties of YAG ceramics. The results show that the additions of LiF not only effectively reduce the sintering temperature of YAG ceramics but also remarkably improve their microwave dielectric properties. When the LiF addition is 5%(mass fraction), the YAG ceramics, sintered at 1500 ℃ for 6 h, have large relative density(～97.5%), homogeneous and dense microstructure, and excellent microwave dielectric properties(ε_r～11.3,Q·f～67130 GHz,and τ_f ～-53.4×10~(-6 )℃~(-1)). When the addition of LiF is excess, the porosity of YAG ceramics increase, and the value of Q·f decreased considerably.
The YAG ceramics were prepared by the conventional solid-state reaction method. We studied the effects of sintering temperature and LiF addition on the microstructure and microwave dielectric properties of YAG ceramics. The results show that the additions of LiF not only effectively reduce the sintering temperature of YAG ceramics but also remarkably improve their microwave dielectric properties. When the LiF addition is 5%(mass fraction), the YAG ceramics, sintered at 1500 ℃ for 6 h, have large relative density(～97.5%), homogeneous and dense microstructure, and excellent microwave dielectric properties(ε_r～11.3,Q·f～67130 GHz,and τ_f ～-53.4×10~(-6 )℃~(-1)). When the addition of LiF is excess, the porosity of YAG ceramics increase, and the value of Q·f decreased considerably.
引文
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[2]Agrawal A.Latest global developments in microwave materials processing [J].Materials Research Innovations,2010,14(1):4-8.
[3]Zhang K,Li W,Lin H X.Effect of MgO/Eu2O3 co-doping on the microwave dielectric properties of Al2O3 ceramics [J].Journal of Inorganic Materials,2015,30(9):984-988.
[4]Lyu Y,Zuo R,Yue Z.Structure and microwave dielectric properties of Ba3(VO4)2-Zn2-xSiO4-x ceramic composites [J].Materials Research Bulletin,2013,48(6):2011-2017.
[5]Song K X,Chen X M,Zheng C W.Microwave dielectric characteristics of ceramics in Mg2SiO4-Zn2SiO4 system [J].Ceramics International,2008,34(4):917-920.
[6]Song K X,Yang Y Q,Zheng P,et al.Microstructures and microwave dielectric properties of (Mg1-xSrx)2Al4Si5O18 ceramics [J].Journal of Inorganic Materials,2012,27(6):575-579.
[7]Tony J,Sebastian M T,Heli J,et al.Tape casting and dielectric properties of Sr2ZnSi2O7-based ceramic-glass composite for low-temperature co-fired ceramics applications [J].International Journal of Applied Ceramic Technology,2011,8(4):854-864.
[8]Lei W,Lyu W Z,Wang X C.Temperature compensating ZnAl2O4-Co2TiO4 spinel-based low-permittivity microwave dielectric ceramics [J].Ceramics International,2012,38(1):99-103.
[9]Tsai W C,Liou Y H,Liou Y C.Microwave dielectric properties of MgAl2O4-CoAl2O4 spinel compounds prepared by reaction-sintering process [J].Materials Science & Engineering B,2012,177(13):1133-1137.
[10]Zhang S,Su H,Zhang H,et al.Microwave dielectric properties of CaWO4-Li2TiO3 ceramics added with LBSCA glass for LTCC applications [J].Ceramics International,2016,42(14):15242-15246.
[11]Bian J J,Kim D W,Hong K S.Microwave dielectric properties of A2P2O7 (A=Ca,Sr,Ba;Mg,Zn,Mn) [J].Japanese Journal of Applied Physics,2004,43(6A):3521-3525.
[12]Kim J C,Kim M H,Lim J B,et al.Synthesis and microwave dielectric properties of Re3Ga5O12 (Re:Nd,Sm,Eu,Dy,Yb,and Y) ceramics [J].Journal of the American Ceramic Society,2007,90(2):641-644.
[13]Krupka J,Derzakowski K,Tobar M,et al.Complex permittivity of some ultra loss dielectric crystals at cryogenic temperatures [J].Measurement Science and Technology,1999,10:387-392.
[14]Kagomiya I,Matsuda Y,Kakimoto K,et al.Microwave dielectric properties of YAG ceramics [J].Ferroelectrics,2009,387:1-6.
[15]Sunny A,Viswanath V,Surendran K P,et al.The effect of Ga3+ addition on the sinterability and microwave dielectric properties of RE3Al5O12 (Tb3+,Y3+,Er3+ and Yb3+) garnet ceramics [J].Ceramics International,2014,40(3):4311-4317.
[16]Wang R,Zhou J,Li B,et al.CaF2-AlF3-SiO2 glass-ceramic with low dielectric constant for LTCC application [J].Journal of Alloys and Compound,2010,490:204-207.
[17]Zhang X R,Fan G F,Lyu W Z,et al.Effect of the spark plasma sintering parameters,LiF additive,and Nd dopant on the microwave dielectric and optical properties of transparent YAG ceramics [J].Journal of the European Ceramic Society,2016,36:2767-2772.
[18]Hakki B W,Coleman P D.A dielectric method of measuring inductive capacitance in the millimeter range [J].IEEE Transactions on Microwave Theory and Techniques,1960,8:402-410.
[19]Zhang Q L,Yang H,Zou J L,et al.Sintering and microwave dielectric properties of LTCC-zinc titanate multilayers [J].Materials Letters,2005,59(8):880-884.
[20]苏静,张庆礼,殷绍唐,等.Nd∶Y3Al5O12单晶及纳米粉体的Raman光谱分析 [J].光谱学与光谱分析,2009,29(6):1577-1580.
[21]Kim E S,Chun B S,Freer R,et al.Effects of packing fraction and bond valence on microwave dielectric properties of A2+B6+O4 (A2+:Ca,Pb,Ba;B6+:Mo,W) ceramics [J].Journal of the European Ceramic Society,2010,30(7):1731-1736.
[22]Huang C L,Chen J Y.Microwave dielectric characteristics of (Mg0.95M0.05)Ta2O6 (M=Ni,Zn,Mn)ceramic series [J].Materials Letters,2012,76:28-31.