Microwave dielectric properties of Li3A3Te2O12 (A = Y, Yb) garnets for low temperature cofired ceramic technologies

作者：Tang, Ying; Li, Huan; Li, Jie^*; Xiang, Huaicheng^*; Fang, Liang

来源：Journal of the European Ceramic Society, 2022, 42(5): 2248-2253.

DOI：10.1016/j.jeurceramsoc.2021.12.079

• Li(3)A(3)Te(2)O(12) (A = Y, Yb) garnets
• Microwave dielectric properties
• LTCC
• Chemical compatibility with Ag

Te6+-containing microwave dielectric ceramics Li(3)A(3)Te(2)O(12) (A = Y, Yb) with low firing temperatures were prepared using the solid-state reaction method. Li3Y3Te2O12 and Li3Yb3Te2O12 can be obtained as garnet single-phase ceramics with low sintering temperatures of 940 degrees C and 950 degrees C, respectively. The cations, such as Li+, Te6+, and Y3+/Yb3+, fully occupied the tetrahedral, octahedral, and dodecahedral sites of garnet structure, respectively. Li(3)A(3)Te(2)O(12) (A = Y, Yb) ceramics exhibit epsilon(r) similar to 7.83 +/- 0.2 and 5.94 +/- 0.2, Q x f similar to 47,800 +/- 500 GHz and 41,800 +/- 500 GHz, and tau(f) similar to -47 +/- 3.0 ppm/degrees C and -76 +/- 3.0 ppm/degrees C, respectively. The full width at half-maximum (FWHM) values of the A(1g) Raman mode correlate negatively with the Q x f values. Moreover, Li(3)A(3)Te(2)O(12)(A = Y, Yb) ceramics possess good chemical compatibility with the Ag electrode, making them promising candidates for low-temperature cofired ceramics (LTCC) technologies.

• 单位
  广西大学; 桂林理工大学