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$(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ 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 (1-x)Mg$TiO_3$-xSr$TiO_3$(x=0.02~0.08)세라믹스의 마이크로파 유전특성
최의선,이성갑,배선기,이영희,Choi, Eui-Sun,Lee, Sung-Gap,Bae, Seon-Gi,Lee, Young-Hie 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.12
The (1-x)MgTi $O_3$-xSrTi $O_3$(x=0.02~0.08) ceramics were fabricated by the conventional mixed oxide method. The sintering temperature and time were 125$0^{\circ}C$~1375$^{\circ}C$ and 2hours. The structure and microwave dielectric properties were investigated with sintering temperature and composition ratio. From the X-ray diffraction patterns, the cubic SrTi $O_3$and hexagonal MgTi $O_3$structures were coexisted in the (1-x)MgTi $O_3$-xSrTi $O_3$(x=0.02~0.08) ceramics. The dielectric constant($\varepsilon$$_{r}$) was increased and the temperature coefficient of resonant frequency($\tau$$_{f}$)was decreased with addition of SrTi $O_3$. The temperature coefficient of resonant frequency($\tau$$_{f}$) was gradually varied from negative value to positive value with increasing SrTi $O_3$. In the case of 0.96MgTi $O_3$-0.04SrTi $O_3$ceramics sintered at 130$0^{\circ}C$, the dielectric constant, quality factor and temperature coefficient of resonant frequency were 20.5, 5918(at 7.33GHz) and +10ppm/$^{\circ}C$, respectively.y.y.y.
김재식,최의선,이문기,배선기,이영희,Kim, Jae-Sik,Choi, Eui-Sun,Lee, Moon-Kee,Bae, Sun-Gi,Lee, Young-Hie 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.1
The microwave dielectric properties of 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics with H$_3$BO$_3$-SnO were investigated to improve the sintering condition for the LTCC. According to the X-ray diffraction patterns, 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics with H$_3$BO$_3$-SnO had the columbite structure of TiTe$_3$O$_{8}$ phase and the ilmenite structure of MgTiO$_3$ phase and there were no second phase. Increasing the addition of H$_3$BO$_3$-SnO, the density and dielectric constant of the 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics were increased but the quality factor was decreased. The temperature coefficient of resonant frequency was shifted to the negative(-) direction with addition of H$_3$BO$_3$-SnO.EX>-SnO.
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.
(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.
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.