Effects of Li substitution on the sintering behavior, lattice vibration, bond covalence and dielectric properties of SrMgGe2O6 ceramics

作者：He, Yinghan; Wei, Xiaoli; Luo, Wenqian; Wu, You; Yang, Jianhui; Chen, Xiuli^*; Zhou, Huanfu^*

来源：Journal of Materials Science: Materials in Electronics , 2023, 34(18): 1435.

DOI：10.1007/s10854-023-10787-y

• CRYSTAL-STRUCTURE
• VALENCE
• PERMITTIVITY
• IONICITY
• ENERGY
• RAMAN

Pyroxene structure SrMg1-xLi2xGe2O6 (x = 0.025-0.1) ceramics were prepared by a solid-state reaction method. Examines the impact of Li substitution on the sintering behavior, lattice vibration, bond covalence, and dielectric properties of SrMgGe2O6 ceramics. SrMgGe2O6 (space group: C2/c) was detected by XRD. Li+ can enter the lattice to form SrMg1-xLi2xGe2O6 solid solution. Through Rietveld refinement results, the effect of the Li+ doped content on the microwave performances of SMLG ceramics was analyzed. SEM results showed that SrMg0.925Li0.15Ge2O6 ceramics had the best surface morphology at 950 & DEG;C, and exhibited excellent microwave dielectric properties of & epsilon;(r) = 5.91, Qf = 36,985 GHz, & tau;(f) = -59 ppm/ & DEG;C. The relationship between the Qf value of SMLG ceramics and the packing fraction, and the bond valence is discussed. Calculating MgO6 octahedral distortion and bond energy can explain the change in & tau;(f) value. SMLG Ceramics is a strong candidate in the LTCC.

• 单位
  桂林理工大学