Microwave Dielectric Properties of Na5RE(MoO4)4 (RE=La, Gd, Dy, Er) Ceramics with a Low Sintering Temperature

作者：Meng, Liufang; Yuan, Changlai^*; Zhu, Baohua; Liu, Xiao; Liu, Fei; Xu, Jiwen; Zhou, Changrong; Chen, Guohua

来源：Journal of Electronic Materials, 2019, 48(1): 656-661.

DOI：10.1007/s11664-018-6775-7

• Low-temperature sintering
• microwave dielectric properties
• Na5RE(MoO4)(4)
• microstructures

Na5RE(MoO4)(4) (RE=La, Gd, Dy, Er) ceramics have been synthesized by the conventional solid-state reaction method. The crystallizations, microstructures and microwave dielectric properties of Na5RE(MoO4)(4) ceramics were also investigated. The room-temperature x-ray diffraction patterns of Na5RE(MoO4)(4) ceramics illustrate a tetragonal structure with a I 4(1)/a space group. The grain size of Na5La(MoO4)(4) is larger than that of Na5RE(MoO4)(4) (RE=Gd, Dy, Er) ceramics, and uneven grains are observed in the systems. Na5RE(MoO4)(4) ceramics sintered at 570-690 degrees C for 4h possess excellent microwave dielectric properties with epsilon(r)=6.4-8.4, (f)=-27.7-34.3ppm/degrees C, and Qxf=4073-24411GHz at their optimum sintering temperature. The nonreactivity of Na5Er(MoO4)(4) with silver is evidenced by x-ray diffraction, and SEM and EDS analysis reveal that silver can be a co-firable electrode material for the present ceramics.

• 出版日期2019-1
• 单位桂林电子科技大学