低介电损耗MgLnGaO_4(Ln=La,Nd,Sm)微波介质陶瓷的制备及性能研究
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摘要
研究了传统固相反应法制得的MgLnGaO_4(Ln=La,Nd,Sm)陶瓷相组成、显微结构、烧结性能与微波介电性能之间的关系。结果表明:通过添加不同稀土元素所得的MgLaGaO_4和MgNdGaO_4试样为单一正交钙钛矿结构;而MgSmGaO_4试样形成的是A_3B_5O_12型石榴石结构固溶体。当烧结条件为1420℃/4 h时,MgSmGaO_4陶瓷可获得最佳的微波介电性能,介电常数为12.599,品质品数为70657.16 GHz(f=8.85 GHz),谐振频率温度系数为-7.2×10-7/℃。
MgLnGaO_4(Ln=La, Nd, Sm) ceramics were prepared by solid-phase reaction method. The relationships among their phase composition, microstructures, sintering characteristics, and microwave dielectric properties were studied. The results show that the MgLaGaO_4 and MgNdGaO_4 samples obtained by adding different rare earth elements have orthorhombic perovskite structures, while the MgSmGaO_4 sample is the A_3B_5O_12-type garnet structure solid solution. When the MgSmGaO_4 sample is sintered at1420 ℃ for 4h, the MgSmGaO_4 ceramic has the best microwave dielectric properties. The dielectric constant is 12.599, the quality factor is 70657.16 GHz(f=8.85 GHz), and the temperature coefficient of resonant frequency(τf) is-7.2×10-7/℃.
MgLnGaO_4(Ln=La, Nd, Sm) ceramics were prepared by solid-phase reaction method. The relationships among their phase composition, microstructures, sintering characteristics, and microwave dielectric properties were studied. The results show that the MgLaGaO_4 and MgNdGaO_4 samples obtained by adding different rare earth elements have orthorhombic perovskite structures, while the MgSmGaO_4 sample is the A_3B_5O_12-type garnet structure solid solution. When the MgSmGaO_4 sample is sintered at1420 ℃ for 4h, the MgSmGaO_4 ceramic has the best microwave dielectric properties. The dielectric constant is 12.599, the quality factor is 70657.16 GHz(f=8.85 GHz), and the temperature coefficient of resonant frequency(τf) is-7.2×10-7/℃.
引文
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[4]Kim H S,Jeon C J.Microwave Dielectric Properties of ATi O3(A-Ni,Mg,Co,Mn)Ceramics[J].Journal of the European Ceramic Society,2010,30(2):341-346.
[5]Nomura S,Toyama K,Kaneta K.Ba(Mg1/3Ta2/3)O3Ceramics with Temperature-stable High Dielectric Constant and Low Microwave Loss[J].Japanese Journal of Applied Physics,1982,21(10):624-626.
[6]Xue X M,Yu H T,Xu G L.Phase Composition and Microwave Dielectric Properties of Mg-excess Mg Ti O3Ceramics[J].Journal of Material Science Material in Electronics,2013,24(4):1287-1291.
[7]Xiao Y,Chen X M,Liu X Q.Microstructures and Microwave Dielectric Characteristics of Ca RAl4(R=Nd,Sm,Y)Ceramics with Tetragonal K2Ni F4Structure[J].Journal of the American Ceramic Society,2004,87(11):2143-2146.
[8]Yuan H X,Chen X M,Mao M M.Structure and Microwave Dielectric Characteristics of Ca1+xNd1-xAl1-xTixO4Ceramics[J].Journal of the American Ceramic Society,2009,92(10):2286-2290.
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[11]Kim J C,Kim M H,Nahm S,et al.Microwave Dielectric Properties of Re3Ga5O12(Re:Nd,Sm,Eu,Dy and Yb)Ceramics and Effect of Ti O2on the Microwave Dielectric Properties of Sm3Ga5O12Ceramics[J].Journal of the European Ceramic Society.2007,27(8-9):2865-2870.
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