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(1-x)Mg₄Ta₂O?-x(TiO₂, CaTiO₃, SrTiO₃) 세라믹스의 마이크로파 유전 특성
金再植(Jae-Sik Kim),崔儀善(Eui-Sun Choi),裴善基(Seon-Gi Bae),李永熙(Young-Hie Lee) 대한전기학회 2006 전기학회논문지C Vol.55 No.7
The effect of x on microwave dielectric properties of the (1-x)Mg₄Ta₂O?-x(TiO₂,CaTiO₃,SrTiO₃) ceramics for microwave components were investigated. All spcecimens prepared by the conventional mixed oxied method and sintered at 1450℃. Microwave dielectric properties of the (1-x)Mg₄Ta₂O?-xTiO₂ ceramics were influenced by MgTi₂O? phase. Also the microwave dielectric properties of the (1-x)Mg₄Ta₂O?-x(CaTiO₃, SrTiO₃) ceramics were dominated with an addition of CaTiO₃ and SrTiO₃. The dielectric constant (ε<SUB>r</SUB>), quality factor (Q×f<SUB>r</SUB>) and temperature coefficient of the resonant frequency (TCRF, τ<SUB>f</SUB>) of the (1-x)Mg₄Ta₂O?-x(TiO₂, CaTiO₃, SrTiO₃) ceramics were 12.96~70.98, 5,132~186,410 ㎓ and -35.82~+75.96 ppm/℃, respectively, and depend on x and addition materials.
$(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ 세라믹스의 마이크로파 유전 특성
김재식,최의선,배선기,이영희,Kim, Jae-Sik,Choi, Eui-Sun,Bae, Seon-Gi,Lee, Young-Hie 대한전기학회 2006 전기학회논문지C Vol.55 No.7
The effect of x on microwave dielectric properties of the $(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ ceramics for microwave components were investigated. All spcecimens prepared by the conventional mixed oxied method and sintered at $1450^{\circ}C$. Microwave dielectric properties of the $(1-x)Mg_4Ta_2O_9-xTiO_2$ ceramics were influenced by $MgTi_2O_5$ phase. Also the microwave dielectric properties of the $(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ ceramics were dominated with an addition of $CaTiO_3\;and\;SrTiO_3$. The dielectric constant $(\varepsilon_r)$, quality factor $(Q{\times}f_r)$ and temperature coefficient of the resonant frequency $(TCRF,\;\tau_f)$ of the $(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ ceramics were $12.96\sim70.98,\;5,132\sim186,410GHZ$ and $-35.82\sim+75.96ppm/^{\circ}C$, respectively, and depend on x and addition materials.
소결온도에 따른 0.7Mg<sub>4</sub>Ta<sub>2</sub>O<sub>9</sub>-0.3SrTiO<sub>3</sub> 세라믹스의 마이크로파 유전특성
김재식,최의선,이문기,이영희,배선기,Kim, Jae-Sik,Choi, Eui-Sun,Lee, Moon-Kee,Lee, Young-Hie,Bae, Seon-Gi 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6
The structural and microwave dielectric properties of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics with sintering temperature were investigated. All the sample of the $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics were prepared by conventional miked oxide method and the sintering temperature was $1425\~1500^{\circ}C$. The hexagonal phase of $Mg_4Ta_2O_9$ and the cubic phase of $SrTiO_3$ were coexisted. The porosity of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics were reduced with increasing sintering temperature. In the case of $0.7Mg_4Ta_2O_9-0.3SrTiO_3$ ceramics sintered at $1475^{\circ}C$, dielectric constant, quality factor and temperature coefficient of resonant frequency were 14.51, 82,596 GHz and $-3.14\;ppm/^{\circ}C$, respectively.
김재식(Jae-Sik Kim),김상우(Sang-Woo Kim),류기원(Ki-Won Ryu),배선기(Seon-Gi Bae),이영희(Young-Hie Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The sintering behavior and high frequency properties of Ba-hexagonal ferrite were investigated. All samples of the Ba-hexagonal ferrite were prepared by the conventional mixed oxide method and sintered at 1150℃~1400℃. From the X-ray diffraction patterns of sintered Ba-hexagonal ferrite, the Ba₃Co₂Fe₂₄O₄₁ phase was represented as main phase in the almost sintering conditions. The bulk densities with sintering temperature and decreased at 1400℃. The bulk density of Ba₃Co₂Fe₂₄O₄₁ ceramics sintered at 1300℃ was 4.79 g/㎤. The permittivity (ε') of Ba₃Co₂Fe₂₄O₄₁ ceramics was increased and the permeability was decreased with sintering temperature, respectively. The permittivity and permeability of Ba₃Co₂Fe₂₄O₄₁ ceramics sintered at 1300℃ were 19.896 and 14.218 at 210 ㎒, respectively.
조성비에 다른 Ba₃Co<SUB>2-2x</SUB>Mn<SUB>2x</SUB>Fe₂₄O₄₁ 세라믹스의 마이크로파 특성
김재식(Jae-Sik Kim),최의선(Eui-Sun Choi),류기원(Ki-Won Ryu),배선기(Seon-Gi Bae),이영희(Young-Hie Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The sintering behavior and microwave properties of Ba₃Co<SUB>2-2x</SUB>Mn<SUB>2x</SUB>Fe₂₄O₄₁ ceramics were investigated. All samples were prepared by the conventional mixed oxide method and sintered at 1150℃∼1400℃. From the X-ray diffraction patterns of sintered Ba₃Co<SUB>2-2x</SUB>Mn<SUB>2x</SUB>Fe₂₄O₄₁ ceramics, the Z-type phase was existed as main phase at sintering temperature of 1350℃. The permittivity and permeability of Ba₃Co<SUB>2-2x</SUB>Mn<SUB>2x</SUB>Fe₂₄O₄₁ ceramics were increased with Mn additions and decreased rapidly over frequency of 600 ㎒. The loss tangent of permittivity and of permeability did not changed hardly with composition ratio and increased over frequency of 600 ㎒. The magnetic resonance frequency of Ba₃Co<SUB>2-2x</SUB>Mn<SUB>2x</SUB>Fe₂₄O₄₁ ceramics was about 600 ㎒. The permittivity, loss tangent of permittivity, permeability and loss tangent of permeability of Ba₃Co<SUB>1.4</SUB>Mn<SUB>0.6</SUB>Fe₂₄O₄₁ ceramics sintered at 1250℃ were 27.276, 0.171, 20.448 and 0.068 at 310 ㎒, respectively.
김재식(Jae-Sik Kim),류기원(Ki-Won Ryu),배선기(Seon-Gi Bae),이영희(Young-Hie Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The sintering and high frequency electro-magnetic properties of Ba-hexagonal ferrite were investigated. All samples of the Ba-hexagonal ferrite were prepared by the conventional mixed oxide method and sintered at 1150℃∼1400℃. From the X-ray diffraction patterns of sintered Ba-hexagonal ferrite, the Ba₃Co₂Fe₂₄O₄₁ phase was represented as main phase in the almost sintering conditions. The bulk densities with sintering temperature and decreased at 1400℃. The permittivity (ε') and loss tangent of permittivity (ε"/ε') of Ba₃Co₂Fe₂₄O₄₁ ceramics increased and decreased with sintering temperature, respectively. The permeability of Ba3Co2Fe24O41 ceramics decreased with sinteirng temperature. The loss tangent of permeability was not changed compared each other with sintering temperature. The bulk density of Ba₃Co₂Fe₂₄O₄₁ ceramics sintered at 1300℃ was 4.79 g/㎤. The permittivity, loss tangent of permittivity and permeability, loss tangent of permeability were 19.896, 0.1718 and 14.218, 0.2046 at 210 MHz, respectively.