Boron substitution in LiAlO2 to facilitate densification and tune dielectric properties

作者：Cao, Xuefeng; Chen, Deqin; Li, Fengrong; Liu, Laijun; Shen, Qinghua; Li, Chunchun^*

来源：Journal of Materials Science: Materials in Electronics , 2023, 34(2): 145.

DOI：10.1007/s10854-022-09530-w

• CRYSTAL-STRUCTURE
• CERAMICS
• BEHAVIOR
• ZN
• MO

A series of low-permittivity LiAl1 - xBxO2 (0.01 <= x <= 0.10) ceramics were fabricated by a conventional solid-state reaction method and were characterized for their phase evolution, crystal structure, and dielectric properties. Single-phase LiAl1 - xBxO2 solid solutions were formed at a limited compositional range (x = 0.05) while the secondary phase Li-2(BAlO4) companied at higher dopant contents. Boron substitution facilitated the sintering behavior and optimized the densification of LiAlO2, resulting in dense microstructures and improved dielectric properties. A composition with x = 0.075 exhibited a high quality factor (Qxf) of 40,288 GHz along with a low relative permittivity (epsilon(r)) of 6.3 and a temperature coefficient of resonance frequency (tau(f)) of - 191 ppm/C-o. All results indicate that the LiAl1 - xBxO2 ceramics can be a promising candidate material in the application of the substrate.

• 单位
  广西大学; 桂林理工大学