• Proceedings of the Materials Research Society of Korea Conference
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• 1994.11a
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• pp.88-88
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• 1994

• Proceedings of the Korean Ceranic Society Conference
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• 2004.04b
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• pp.40.2-40.2
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 1999.08a
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• pp.42-43
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• 1999

• Proceedings of the Materials Research Society of Korea Conference
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• 1996.05a
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• pp.36-36
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• 1996

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.11a
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• pp.54-54
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.11a
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• pp.165-165
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.11a
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• pp.27-27
• /
• 2002

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.11a
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• pp.284-287
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• 2002

The $BaTi_{4}O_{9}$ ceramics with CoO(0.5wt%) were prepared by the conventional mixed oxide method. The sintering temperature and time were $1350^{\circ}C$, 3hr., respectively. The structural properties were investigated with sintering temperature by XRD. Also the microwave dielectric properties of the $BaTi_{4}O_{9}$ ceramics were studied. According to the X -ray diffraction patte구 of the $BaTi_{4}O_{9}$ ceramics with CoO(0.5wt%), the orthorhombic $BaTi_{4}O_{9}$ structure was appeared. In the case of $BaTi_{4}O_{9}$ ceramics with CoO(0.5wt%), dielectric constant $(\varepsilon_{r})$, quality factor$(Q{\times}f_r)$ and temperature coefficient of resonant frequency$(\tau_{f})$ were 40.8, 43,270 and $2.5ppm/^{\circ}C$, respectively.ࠀࠀ Ѐ耀
Āࠀ 耀耀  ࠀက@ĀĀȀ
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 @䀀က 䀀Ѐ€耀 Ȁ @ ࠀЀЀကȀȀЀ Āက蠀

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.186.2-186
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• 2003

• Korean Journal of Materials Research
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• v.18 no.2
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• pp.107-111
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• 2008

[ $BaO{\cdot}Nd_2O_3{\cdot}5TiO_2$ ] (BNT) ceramics modified with a borate glass containing Ba, Nd and Ti as glass constituents were investigated with regard to their sintering behavior and microwave dielectric properties. An addition of iso-component glass significantly improved the sinterabilty of the BNT ceramics and lowered the sintering temperature. A maximum density of $5.29\;g/cm^3$ and an x-y shrinkage of 17% were obtained for BNT ceramics containing 10wt.% of the glass sintered at $1100^{\circ}C$. The dielectric composition without the glass additive was only slightly densified at $1100^{\circ}C$. The resulting sample exhibited two crystalline phases, $BaNd_2Ti_5O_{14}$ and $Ba_2Ti_9O_{20}$, regardless of sintering temperature and glass content. When >10wt.% glass was added, exaggerated grain growth with a less uniform microstructure was found, resulting in the subsequent reduction of the fired density and the dielectric properties. BNT ceramics containing 10wt.% of the isocomponent glass sintered at $1100^{\circ}C$ for 4 h showed promising dielectric properties of k = 71.3 and Q = 1,330.