Crystal structure and microwave dielectric properties of [(Mg_0.6Zn_0.4)_0.95Co_0.05]₂TiO₄ modified Ca_0.8Sm_0.4/3TiO₃ ceramics

详细信息    查看全文

• 作者：Shih-Hung Lin^a ; ^{isshokenmei@thu.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Yuan-Bin Chen^b ; ^{cubnck@yahoo.com.tw" class="auth_mail" title="E-mail the corresponding author}
• 关键词：[(Mg0.6Zn0.4)0.95Co0.05]2TiO4 ; Ca0.8Sm0.4/3TiO3 ; Microwave dielectric properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：296-300
• 全文大小：1286 K

文摘

High-quality x[(Mg_0.6Zn_0.4)_0.95Co_0.05]₂TiO₄-(1-x)Ca_0.8Sm_0.4/3TiO₃ ceramics were prepared by solid-state reaction. [(Mg_0.6Zn_0.4)_0.95Co_0.05]₂TiO₄ has a dielectric constant (ε_r) of ~18, a high quality factor (Q×f) of ~206,000 GHz, and a temperature coefficient of resonant frequency (τ_f) of ~−20.8 ppm/°C. To produce a temperature-stable material, Ca_0.8Sm_0.4/3TiO₃, which has a large positive τ_f value of +400 ppm/°C, was added to [(Mg_0.6Zn_0.4)_0.95Co_0.05]₂TiO₄. 0.93[(Mg_0.6Zn_0.4)_0.95Co_0.05]₂TiO₄ −0.07 Ca_0.8Sm_0.4/3TiO₃ has an excellent combination of microwave dielectric properties: ε_r~18.24, Q×f ~150,000 (at 9 GHz), and τ_f ~1 ppm/°C sinters at 1175 °C, and can be utilized in the fabrication of microwave devices.