A novel LiNb0.6Ti0.5O3 microwave dielectric ceramic with Ca substitutions

作者：Sun, Huaibao; Li, Enzhu^*; Yang, Hongyu; Yang, Hongcheng; Zhang, Shuren

来源：Materials Letters, 2018, 210: 275-278.

DOI：10.1016/j.matlet.2017.09.042

• LiNb0.6Ti0.5O3
• CaCO3
• Ceramics
• Microwave dielectric properties
• Microstructure

A novel microwave dielectric ceramic LiNb0.6Ti0.5O3 (LNT) with Ca substitutions LiNb0.6Ti(0.5-x)Ca1.231xO3 was synthesized by solid-state method. It was found that with Ca substitutions, the temperature coefficient of resonant frequency tau(f) could be adjusted to zero, due to the appearance of the second phase Ca5Nb4Ti3O21. The tau(f) of the Ca5Nb4Ti3O21 phase is -144.3 ppm/degrees C through the simulation and numerical value calculation. Furthermore, the LiNb0.6Ti(0.5-x)Ca1.231xO3 ceramic shows a higher dielectric constant epsilon(r) and a denser microstructure. The LiNb0.6Ti(0.5-x)Ca1.231xO3 ceramic with x = 0.03 sintered at 1100 degrees C for 2 h shows excellent microwave dielectric properties: epsilon(r) = 76.89, Q x f = 4064 GHz, tau(f) = 0.25 ppm/degrees C.

• 出版日期2018-1-1
• 单位电子科技大学