Details

Autor(en) / Beteiligte

• Li, Jie
• Zhang, Zhiwei
• Tian, Yunfei
• Ao, Laiyuan
• Chen, Junqi
• Yang, Aihong
• Su, Congxue
• Liu, Laijun
• Tang, Ying
• Fang, Liang

Titel

Crystal structure and microwave dielectric properties of a novel rock-salt type Li3MgNbO5 ceramic

Ist Teil von

• Journal of materials science, 2020-11, Vol.55 (33), p.15643-15652

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2020

Quelle

SpringerNature Journals

Beschreibungen/Notizen

• A new rock-salt type compound, namely Li 3 MgNbO 5 , was synthesized using traditional two-step sintering process for the first time. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermal dilatometer and network analyzer. The Li 3 MgNbO 5 ceramic sintered at 1260 °C adopted a cubic structure with Fm-3 m space group and exhibited excellent microwave dielectric properties (MDPs) of ε r  = 16.2, Q  ×  f  = 96796 GHz, and TCF = − 24.8 ppm/°C. The fitting results of the infrared spectrum indicated that the dielectric polarization of Li 3 MgNbO 5 in microwave frequency band was contributed by phonon absorption in infrared band. Furthermore, the negative TCF value of Li 3 MgNbO 5 ceramic was compensated with a traditional TCF compensator ~ CaTiO 3 . A near-zero TCF value of + 1.2 ppm/°C was achieved in the composite 0.96Li 3 MgNbO 5 –0.04CaTiO 3 ceramics with ε r  = 18.4 and high Q  ×  f  = 86625 GHz, exhibiting a great potential to be applied in microelectronics systems.