Sintering and compositional effects on the microwave dielectric characteristics of Mg(Ta1−x
Nb
x
)2O6 ceramics with 0.25 ≦ x ≦ 0.35 |
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Authors: | Chien-Min Cheng Ying-Chung Chen Cheng-Fu Yang Chao-Chin Chan |
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Affiliation: | (1) Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China;(2) Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan, Republic of China;(3) Department of Biochemical Engineering, Kao Yuan Institute of Technology, Kaohsiung, Taiwan, Republic of China |
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Abstract: | 1,500 °C−sintered MgTa2O6 ceramic exhibits microwave dielectric characteristics of ɛ
r = 30.5, Q × f = 56,900 GHz, and τ
f = 28.3 ppm/°C, whereas 1,400 °C-sintered MgNb2O6 ceramic exhibits microwave dielectric characteristics of ɛ
r = 21.7, Q × f = 89,900 GHz, and τ
f = −68.5 ppm/°C. In order to find the dielectric resonators with τ
f value close to 0 ppm/°C, the effects of sintering condition and composition on the microwave dielectric characteristics of
Mg(Ta1−x
Nb
x
)2O6 ceramics (0.25 ≦ x ≦ 0.35) prepared under sintering temperature of 1,300–1,450 °C are investigated. The results show that as the sintering temperature
increases from 1,300 to 1,450 °C, the ɛ
r, Q × f and τ
f values of Mg(Ta1−x
Nb
x
)2O6 ceramics all increase and saturate at 1,450 °C. On the other hand, as the Nb2O5 content decreases, the τ
f values of Mg(Ta1−x
Nb
x
)2O6 ceramics will shift to near 0 ppm/°C. The optimized sintering conditions and composition to obtain the Mg(Ta1−x
Nb
x
)2O6 dielectrics with τ
f close to 0 ppm/°C are sintering temperature of 1,450 °C, sintering duration of 4 h, and composition of x = 0.25, which exhibits the microwave dielectric characteristics of ɛ
r = 27.9, Q × f = 33,100 GHz, and τ
f = −0.7 ppm/°C. |
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Keywords: | Mg(Ta1− x Nb x )2O6 Microwave characteristics Orthorhombic |
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