• Title/Summary/Keyword: $MgTiO_3-SrTiO_3$

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The Microwave Dielectric Properties of $0.96MgTiO_3-0.04SrTiO_3+xLa(0{\sim}1.0wt%)$ Ceramics ($0.96MgTiO_3-0.04SrTiO_3+xLa(0{\sim}1.0wt%)$ 세라믹스의 마이크로파 유전 특성)

  • Park, Bo-Geun;Um, Sung-Soo;Kim, Kang;Lee, Young-Hie
    • Proceedings of the KIEE Conference
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    • 2001.11a
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    • pp.118-120
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    • 2001
  • The $0.96MgTiO_3-0.04SrTiO_3+xLa(0{\sim}1.0wt%)$ ceramics were prepared by conventional mixed oxide method. The structural properties of $0.96MgTiO_3-0.04SrTiO_3+xLa(0{\sim}1.0wt%)$ ceramics with sintering temperature were investigated by the XRD and SEM. From the X-ray diffraction patterns, it was found that the perovskite $SrTiO_3$ and ilmenite $MgTiO_3$ structures were coexisted in the $0.96MgTiO_3-0.04SrTiO_3$ ceramics. The second phase of $Sr_{0.5}LaTi_2O_6$ was shown with addition of the $La_2O_3$. The dielectric constant(${\varepsilon}_r$), $Q{\times}f$ value and the temperature coefficient of the $0.96MgTiO_3-0.04SrTiO_3+0.2La$ ceramics were 21. 41, 39991, $-3.3ppm/^{\circ}C$, respectively.

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Structural and Microwave Dielectric Properties of the $0.9MgTiO_3-0.1SrTiO_3$ Ceramics with Sintering Temperature (소결온도에 따른 $0.9MgTiO_3-0.1SrTiO_3$ 세라믹스의 구조 및 마이크로파 유전특성)

  • Choe, Ui-Seon;Lee, Mun-Gi;Ryu, Gi-Won;Bae, Seon-Gi;Lee, Yeong-Hui
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.5
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    • pp.294-298
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    • 2000
  • The $MgTiO_3\; and \;$0.9MgTiO_3-0.1SrTiO_3$ ceramics were fabricated by the conventional mixed-oxide method. The sintering temperature and time were $1300^{\circ}C~1600^{\circ}C$, 2hr., respectively. The structural and microwave dielectric properties were investigated with sintering temperature and the application for the satellite communication microwave dielectric resonator was investigated. The coexistence of cubic $SrTiO_3$ and hexagonal TEX>$MgTiO_3$ structures in $0.9MgTiO_3-0.1SrTiO_3$ ceramics were found from X-ray diffraction patterns. In the case of $MgTiO_3$ ceramics, sphere phase and needle-like phase were coexisted. The $0.9MgTiO_3-0.1SrTiO_3$ ceramics observed sphere phase. The dielectric constants and temperature coefficient of resonant $frequency(\tauf)$ were increased with addition of $SrTiO_3$ but the quality factor was decreased. The dielectric constant, quality factor and $\tau$f of the;$0.9MgTiO_3-0.1SrTiO_3$ ceramics were 22.61, 10.928(at 1GHz) and $+50.26ppm/^{\circ}C$, respectively.

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Microwave Dielectric Properties of the $(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ Ceramics ($(1-x)Mg_4Ta_2O_9-x(TiO_2,\;CaTiO_3,\;SrTiO_3)$ 세라믹스의 마이크로파 유전 특성)

  • Kim, Jae-Sik;Choi, Eui-Sun;Bae, Seon-Gi;Lee, Young-Hie
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.7
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    • pp.344-348
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    • 2006
  • 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.

Structural and Microwave Dielectric Properties of the $0.94MgTiO_3-0.06SrTiO_3$ Ceramics with Sintering Temperature (소결온도에 따른 $0.94MgTiO_3-0.06SrTiO_3$ 세라믹스의 구조 몇 마이크로파 유전특성)

  • Choi, Eui-Sun;Lee, Moon-Kee;Park, In-Gil;Ryu, Ki-Won;Lee, Young-Hie
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.04b
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    • pp.60-63
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    • 2000
  • The $0.94MgTiO_3-0.06SrTiO_3$ ceramics were prepared by the conventional mixed oxide method. The structural properties were investigated with sintering temperature and composition ratio by XRD, SEM and DT-TGA. According to the X-ray diffraction patterns of the $0.94MgTiO_3-0.06SrTiO_3$ ceramics, the cubic $SrTiO_3$ and hexagonal $MgTiO_3$ structures were coexisted. Increasing the sintering temperature from $1325^{\circ}C$ to $1400^{\circ}C$, average grain size was increased from $5.026{\mu}m$ to $8.377{\mu}m$. In the case of the $0.94MgTiO_3-0.06SrTiO_3$ ceramics sintered at $1325^{\circ}C$, dielectric constant, quality factor and temperature coefficient of resonant frequency were 21.66, 2,522(at 7.34GHz), $+71ppm/^{\circ}C$, respectively.

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Microwave dielectric properties of the $0.97MgTiO_3-0.03SrTiO_3$ ceramics with $B_2O_3$ ($B_2O_3$첨가에 따른 $0.97MgTiO_3-0.03SrTiO_3$ 세라믹스의 마이크로파 유전특성)

  • Nam, Gyu-Bin;Kim, Ji-Heon;Lee, Moon-Ki;Bae, Seon-Gi;Lee, Young-Hie
    • Proceedings of the KIEE Conference
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    • 2002.11a
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    • pp.94-96
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    • 2002
  • The $0.97MgTiO_3-0.03SrTiO_3$ ceramics with $B_2O_3$(10wt%) were prepared by the conventional mixed oxide method. The structural properties were investigated with sintering temperature by XRD and SEM. According to the X-ray diffraction patterns of the $0.97MgTiO_3-0.03SrTiO_3$ ceramics with $B_2O_3$(10wt%), the ilmenite $MgTiO_3$ and perovskite $SrTiO_3$ structures were coexisted and secondary phase $MgTi_2O_5$ were appeared. Increasing the sintering temperature. the grain size was increased. In the case of $0.97MgTiO_3-0.03SrTiO_3$ ceramics with $B_2O_3$(10wt%), dielectric constant, quality factor and temperature coefficient of resonant frequency were $13.52{\sim}18.13,\;32750{\sim}51736GHz$, $-15.78{\sim}25.64ppm/^{\circ}C$, respectively.

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Microwave Dielectric Properties of the $MgTiO_3-SrTiO_3$ Ceramics ($MgTiO_3-SrTiO_3$ 세라믹스의 마이크로파 유전특성)

  • 배경인;이상철;최의선;배선기;이영희
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.8
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    • pp.376-381
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    • 2001
  • The(1-x) MgTiO$_3$-xSrTiO$_3$(x=0.03~0.04) ceramics were fabricated by the conventional mixed oxide method. The structural and microwave dielectric properties were investigated by XRD, SEM, EDS and network analyzer. The sintering temperature and time were 1275$^{\circ}C$~135$0^{\circ}C$ and 2hours, respectively. In the XRD results of 0.96MgTiO$_3$-0.04SrTiO$_3$ceramics, the perovskite structure of SrTiO$_3$and ilmenite structure of MgTiO$_3$phase were coexisted. The dielectric constant($\varepsilon$(sub)${\gamma}$) and temperature coefficient of resonant frequency($\tau$(sub)f) were increased with addition of SrTiO$_3$. In thie case of 0.96MgTiO$_3$-0.04SrTiO$_3$ ceramics sintered at 13$25^{\circ}C$, the dielectric constant, quality factor(Q) and temperature coefficient of resonant frequency($\tau$(sub)f) were 20.13, 7956(at 7.27GHz), and +1.76ppm/$^{\circ}C$, respectively.

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Microwave Dielectric Properties of the $MgTiO_3$ Ceramics with $SrTiO_3$ ($SrTiO_3$ 첨가에 따른 $MgTiO_3$ 세라믹스의 마이크로파 유전특성)

  • Bae, Koung-In;Park, In-Gil;Bae, Seon-Gi;Lee, Young-Hie
    • Proceedings of the KIEE Conference
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    • 2000.11c
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    • pp.473-475
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    • 2000
  • The (1-x)$MgTiO_3-xSrTiO_3$$(x=0.03{\sim}0.04)$ ceramics were fabricated by conventional mixed oxide method. The structural properties and microwave dielectric properties were investigated by XRD, SEM and HP8757D network analyzer. In the $0.96MgTiO_3-0.04SrTiO_3$ ceramics, the perovskite structure $SrTiO_3$ and ilmenite structure $MgTiO_3$ phases were coexisted. The dielectric constant(${\varepsilon}_r$ and temperature coefficient of resonant frequency(${\tau}_f$) was increased with addition of $SrTiO_3$. In the case of $0.96MgTiO_3-0.04SrTiO_3$ ceramics sintered at $1325^{\circ}C$, the dielectric constant, quality factor and temperature coefficient of resonant frequency were 20.13, 7956(at 7.27GHz), +1.7568ppm/$^{\circ}C$, respectively.

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The Preparation and Dielectric Properties of (Ba Sr Mg)$TiO_3$Ceramic Capacitors (자기 캐패시터용 (Ba Sr Mg)$TiO_3$ 세라믹스의 제조 및 유전특성)

  • 김범진;박태곤
    • Electrical & Electronic Materials
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    • v.10 no.7
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    • pp.674-681
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    • 1997
  • Ternary compound ceramics, (1-y-x) BaTiO$_3$-y SrTiO$_3$-x MgTiO$_3$(0.00 x 0.20), were fabricated by the conventional ceramic process. The structural and dielectric properties of specimens were investigated while varying the composition and sintering temperature(1,200~1,45$0^{\circ}C$) in order to obtain the optimum condition of capacitor. As is well known, Curie temperature(T$_{c}$) of high dielectric-based ceramic(BaTiO$_3$) was shifted and temperature of capacitance was decreased in according to increase of solid solution with (Sr, Mg)TiO$_3$. As a result, a suitable condition of compound rate for capacitor was obtained such as the BSM-11(0.8BaTiO$_3$-0.1SrTiO$_3$-0.1MgTiO$_3$), and sintering temperature was sintered at 1,25$0^{\circ}C$ for two hours. In this case, dielectric constant<1,300, dielectric loss(tan$\delta$)<0.03, and the variation rate of capacitance had less than 3% in the range -10~7$0^{\circ}C$.>.

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Microwave dielectric properties of $0.96MgTiO_3-0.04SrTiO_3$ ceramics with $B_2O_3$ ($B_2O_3$ 첨가에 따른 $0.96MgTiO_3-0.04SrTiO_3$의 마이크로파 유전특성)

  • Kim, Jung-Hun;Choi, Eui-Sun;Lee, Mun-Ki;Jung, Jang-Ho;Lee, Young-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.682-685
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    • 2002
  • The $0.96MgTiO_3-0.04SrTiO_3$ ceramics with $B_2O_3$(10wt%) were prepared by the conventional mixed oxide method. The structural properties were investigated with sintering temperature by XRD. According to the X-ray diffraction pattern of the $0.96MgTiO_3-0.04SrTiO_3$ ceramics with $B_2O_3$(10wt%), the ilmenite $MgTiO_3$ and perovskite $SrTiO_3$ structures were coexisted and secondary phase of the $MgTi_2O_5$ were appeared. In the case of $0.96MgTiO_3-0.04SrTiO_3+B_2O_3$(10wt%) ceramics sintered $1225^{\circ}C$, dielectric constant, quality factor and temperature coefficient of resonant frequency were 19.82, 62,735GHz, $-2.983ppm/^{\circ}C$, respectively.

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Microwave Dielectric Properties of $0.95MgTiO_3-0.05SrTiO_3$ Ceramics with $V_2O_5$ ($V_2O_5$ 첨가에 따른 $0.95MgTiO_3-0.05SrTiO_3$ 세라믹스의 마이크로파 유전특성)

  • Nam, Gyu-Bin;Kim, Kang;Park, In-Gil;Ryu, Ki-Won;Lee, Young-Hie
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05c
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    • pp.112-116
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    • 2002
  • The $0.95MgTiO_3-0.05SrTiO_3$ ceramics with $V_2O_5$(10wt%) were prepared by the conventional mixed oxide method. The structural properties were investigated with sintering temperatue by XRD. According to the X-ray diffraction pattern of the $0.95MgTiO_3-0.05SrTiO_3$ ceramics with $V_2O_5$(10wt%), the ilmenite $MgTiO_3$ and perovskite $SrTiO_3$ structures were coexisted and secondary phase $MgTi_2O_5$ were appeared. In the case of $0.95MgTiO_3-0.05SrTiO_3$ ceramics with $V_2O_5$(10wt%), dielectric constant, quality factor and temperature coefficient of resonant frequency were 15.84~18.28, 12627~23138GHz, -21.414~1.568$ppm/^{\circ}C$, respectively.

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