TY - JOUR
T1 - Dielectric properties and crystal structure of (1-y) (Mg0.95 Ni0.05)4Ta2O9-y(Ca0.8Sr0.2)TiO3 ceramics
AU - Li, Bing Jing
AU - Wang, Sih Yin
AU - Su, Cong Zhi
AU - Chen, Yuan Bin
N1 - Publisher Copyright:
©2014 The Ceramic Society of Japan. All rights reserved.
PY - 2014
Y1 - 2014
N2 - The microwave dielectric properties and microstructures of (1-y)(Mg0.95Ni0.05)4Ta2O9-y (Ca0.8Sr0.2)TiO3 ceramics prepared using a mixed oxide route were investigated. (Mg0.95Ni0.05)4Ta2O9 has a dielectric constant (εr) of ∼12.23, a high quality factor (Qxf ) of ∼442,092 GHz, and a temperature coefficient of resonant frequency (τf) of ∼-55 ppm/°C. To produce a temperature-stable material, Ca0.8Sr0.2TiO3, which has a large positive τf value of 990ppm/°C, was added to (Mg0.95Ni0.05)4Ta2O9. The temperature coefficient of resonant frequency increased with increasing Ca0.8Sr0.2TiO3 content, going through nearly zero at y = 0.7. The microwave dielectric material 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 has an excellent combination of microwave dielectric properties: εr ∼29.8, Qxf ∼ 226,000GHz (at 9 GHz), and τf ∼-2.38ppm/°C sinter at 1350° C. It is proposed as a candidate material for industrial, scienti fic and medical band components and Global Position System antennas.
AB - The microwave dielectric properties and microstructures of (1-y)(Mg0.95Ni0.05)4Ta2O9-y (Ca0.8Sr0.2)TiO3 ceramics prepared using a mixed oxide route were investigated. (Mg0.95Ni0.05)4Ta2O9 has a dielectric constant (εr) of ∼12.23, a high quality factor (Qxf ) of ∼442,092 GHz, and a temperature coefficient of resonant frequency (τf) of ∼-55 ppm/°C. To produce a temperature-stable material, Ca0.8Sr0.2TiO3, which has a large positive τf value of 990ppm/°C, was added to (Mg0.95Ni0.05)4Ta2O9. The temperature coefficient of resonant frequency increased with increasing Ca0.8Sr0.2TiO3 content, going through nearly zero at y = 0.7. The microwave dielectric material 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 has an excellent combination of microwave dielectric properties: εr ∼29.8, Qxf ∼ 226,000GHz (at 9 GHz), and τf ∼-2.38ppm/°C sinter at 1350° C. It is proposed as a candidate material for industrial, scienti fic and medical band components and Global Position System antennas.
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U2 - 10.2109/jcersj2.122.1000
DO - 10.2109/jcersj2.122.1000
M3 - Article
AN - SCOPUS:84919337107
SN - 1882-0743
VL - 122
SP - 1000
EP - 1003
JO - Journal of the Ceramic Society of Japan
JF - Journal of the Ceramic Society of Japan
IS - 1432
ER -