Effects of LiF on microwave dielectric properties of 0.25Ca0.8Sr0.2TiO3�??0.75Li0.5Nd0.5TiO3 ceramics

Bulletin of materials science

Changlai Yuan³  Fei Liu¹  Xinyu Liu⁴  Jing Jing Qu² 

[1] College of Material Science and Engineering, Central South University, Changsha 410083, PR China$$College of Material Science and Engineering, Central South University, Changsha 410083, PR ChinaCollege of Material Science and Engineering, Central South University, Changsha 410083, PR China$$;Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China$$Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR ChinaDepartment of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China$$;College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR ChinaCollege of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$;College of Material Science and Engineering, Central South University, Changsha 410083, PR China$$College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$College of Material Science and Engineering, Central South University, Changsha 410083, PR ChinaCollege of Material Science and Engineering, Central South University, Changsha 410083, PR China$$College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR ChinaCollege of Material Science and Engineering, Central South University, Changsha 410083, PR China$$College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$

关键词: 0.25Ca0.8Sr0.2TiO3â€�??0.75Li0.5Nd0.5TiO3;    microwave dielectric properties;    microstructures;    LiF.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The effects of LiF addition on sinterability, microstructure and microwave dielectric properties of 0.25Ca_0.8Sr_0.2TiO₃â€�??0.75Li_0.5Nd_0.5TiO₃ ceramics were investigated. The LiF addition enhanced the sintering temperature of 0.25Ca_0.8Sr0.2TiO3â€�??0.75Li0.5Nd0.5TiO3 ceramics from 1200 to 1300°C, because the LiF addition could compensate the evaporation of Li during the sintering process. It was found that the bulk density and dielectric constant (ðœ�?_r) gradually decreased, the quality factor (ð‘�??_f) greatly increased and the temperature coefficient of resonant frequency (𝜏_f) shifted to a near-zero value with the increase in LiF addition. Obviously, excess Li addition could efficiently improve the microwave dielectric properties. In addition, 0.25Ca_0.8Sr_0.2 TiO₃â€�??0.75Li_0.5Nd_0.5TiO₃ + 4.0 wt% LiF ceramics sintered at 1350°C for 4 h exhibited good microwave dielectric properties of ðœ�?_r ∼ 123.4, ð‘�??_f ∼ 2209 GHz (at 2.43 GHz) and 𝜏_f ∼ 12.3 ppm °C^â€�??1.

【 授权许可】

Unknown