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- 저자 : Chun-Hsu Shen (검색결과 2 건)
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Chun-Hsu Shen,Cheng-Liang Huang,Chuan-Feng Shih,Chih-Ming Huang 한국물리학회 2009 Current Applied Physics Vol.9 No.5
The effect of Nd0.5Na0.5TiO3 addition on the microwave dielectric properties of Mg0.95Ni0.05TiO3 ceramics was investigated. The Nd0.5Na0.5TiO3 content plays a significant role in improving the dielectric properties. Microwave dielectric measurements show an increase in the dielectric constant (εr) and temperature coefficient of the resonant frequency (τf) and a decrease in the quality factor (Q × f value) with increasing Nd0.5Na0.5TiO3 content. By properly adjusting the Nd0.5Na0.5TiO3 content, a zero τf value can also be obtained, which make Mg0.95Ni0.05TiO3 a promising material in wireless systems. At 1300 ℃, the 0.81Mg0.95Ni0.05TiO3–0.19Nd0.5Na0.5TiO3 ceramics possess excellent microwave dielectric properties: a dielectric constant (εr) of 25.61, a Q × f value of 69,100 GHz, and a τf value of -6 ppm/℃. The effect of Nd0.5Na0.5TiO3 addition on the microwave dielectric properties of Mg0.95Ni0.05TiO3 ceramics was investigated. The Nd0.5Na0.5TiO3 content plays a significant role in improving the dielectric properties. Microwave dielectric measurements show an increase in the dielectric constant (εr) and temperature coefficient of the resonant frequency (τf) and a decrease in the quality factor (Q × f value) with increasing Nd0.5Na0.5TiO3 content. By properly adjusting the Nd0.5Na0.5TiO3 content, a zero τf value can also be obtained, which make Mg0.95Ni0.05TiO3 a promising material in wireless systems. At 1300 ℃, the 0.81Mg0.95Ni0.05TiO3–0.19Nd0.5Na0.5TiO3 ceramics possess excellent microwave dielectric properties: a dielectric constant (εr) of 25.61, a Q × f value of 69,100 GHz, and a τf value of -6 ppm/℃.
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Ping-Cheng Chen,Chung-Long Pan,Kuei-Chih Lin,Chun-Hsu Shen 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
The lower phase-forming temperature of magnesium titanate, MgTiO3, means that it can be used to replace magnesium ionswith cobalt ions at 0.05 mole when a mixture of diverse low melting point materials as sintering accelerators is employed(single: B2O3, CuO, V2O5, ZnO; binary: ZnO-B2O3). The phase formation of 0.9Mg0.95Co0.05TiO3 - 0.1 Ca0.61Nd0.78/3TiO3 dielectricceramics was verified using XRD diffraction to observe crystallites at different phases. SEM was used to observe the graingrowth of the ceramic system, and the composition ratio of the grain was analyzed via EDS. Compared with 0.9Mg0.95Co0.05TiO3- 0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics without the addition of a sintering accelerator, the results show that the sinteringtemperature could be effectively decremented, and the results of the binary addition were better than the single result. Themicrowave dielectric performances of 0.9Mg0.95Co0.05TiO3 - 0.1Ca0.61Nd0.78/3TiO3 dielectric ceramics were closely related tothe density and growth of grains experienced by the specimens. When 1 wt% binary sintering accelerators (ZnO-B2O3) wereadded to 0.9Mg0.95Co0.05TiO3-0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics, they showed an εr value of 21.7, a Qf value of 42,000 GHz,and a τf value of -27.2 ppm/oC; the phase-forming temperature was minimized from 1350 oC to 1150 oC.
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