Structures, Dielectric Properties and Luminescence Properties of Nb Doped Li₂TiO₃ Solid Solution Ceramics

Abstract:

In this article, the low-firing Li_2+xNb_3xTi_1-4xO₃(x = 0.01, 0.02, 0.04, 0.06) ceramics with monoclinic structure have been obtained by the traditional solid solution method and their microwave dielectric properties were investigated in detail. The ceramics were finely densified at lower temperatures around 1100 °C and demonstrated favorable dielectric performances including relatively low permittivities (ε_r) ranging from 19 to 24, high Q×f values up to 60,000 GHz (f_res = 7.89GHz) and small temperature coefficients of the resonate frequency (for x = 0.02, τ_f = 10.4 ppm/ °C; x = 0.06, τ_f = -11.5 ppm/ °C). Furthermore, the ceramics could be densified at around 900°C with adding low-amount of B₂O₃. Especially, the 1wt.% B₂O₃-doped Li_2+xNb_3xTi_1-4xO₃ (x = 0.06) ceramics was sintered well-densified at 900°C and presented good microwave dielectric properties with ε_r ∼ 22.2, Q×f ∼ 44,000 GHz. In addition, these ceramics have luminescence properties, which indicated that the ceramics would be applied in LTCC and/or luminescence applications as new luminescence LTCC (low temperature co-fired ceramics) materials.

• Periodical: Key Engineering Materials (Volume 748)
• Pages: 137-142
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.748.137
• Online since: August 2017
• Authors: Fei Wang, Chun Feng Yao, Qun Zeng*, He Zhou, Zhi Yong Zhou
• Keywords: Dielectric Properties, Li_2+xNb_3xTi_1-4xO₃ Solid Solution, Luminescence Properties, Structure

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