Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Microwave Dielectric Properties of the LiNb3O8-TiO2 Ceramic System with the Addition of Low Firing Agents

저온 소결제 첨가에 의한 LiNb3O8-TiO2계 세라믹스의 마이크로파 유전 특성

  • 최명호 (공주대학교 공과대학 신소재공학부) ;
  • 김남철 (공주대학교 공과대학 신소재공학부)
  • Published : 2008.06.01
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Abstract

The microwave dielectric properties of $LiNb_3O_8-TiO_2$ based ceramics with low firing agents, CuO, $Bi_2O_3$, $B_2O_3$, $SiO_2$, $TiO_2$, were investigated to improve the sintering condition for the LTCC system. According to the X-ray diffraction and SEM, the ceramics of $LiNb_3O_8-TiO_2$ with low firing agents showed no significant second phases within a range of experiments, and fine microstructures. By adding the low firing agents, the sintering temperature decreased from $1200^{\circ}C$ to $925^{\circ}C$. Based on the results of electrical measurements, the $LiNb_3O_8-TiO_2$ ceramics showed a promising microwave dielectric properties for LTCC applications, those are ${\varepsilon}_r$ (dielectric constant) = 44, Q f (quality factor) = 18000, and ${\tau}_f$ (the temperature coefficient of resonant frequency) = $-1.5\;ppm/^{\circ}C$.

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References

  1. K. Wakino, T. Nishikawa, T. Ishikawa, and H. Tamura, 'Dielectric resonator materials and their applications for mobile communication systems', J. Br. Ceram. Trans, Vol. 89, p. 39, 1990
  2. T. Jaakola, J. Mottoonen, A. Uusimaki, R. Rautioaho, and S. Leppavuori, 'Preparation of Nd-doped $Ba_2Ti_9O_{20}$ ceramics for use in microwave applications', Ceram. Int., Vol. 13, No. 3, p. 151, 1987 https://doi.org/10.1016/0272-8842(87)90025-3
  3. C. A. Harper, 'Handbook of Ceramics, Glasses, and Diamonds', C.H.I.P.S., p. 323, 2001
  4. J. M. Wu, 'Reaction sequence and effect of calcination and sintering on microwave properties of $(Ba,Sr)O-Sm_2O_3-TiO_2$ ceramics', J. Am. Ceram. Soc., Vol. 73, No. 6, p. 1599, 1990 https://doi.org/10.1111/j.1151-2916.1990.tb09802.x
  5. J.-B. Lim, J.-O. Son, S. Nahm, M.-J. Yoo, W.-S. Lee, N.-K. Kang, and H.-J. Lee, 'Low- temperature sintering and microwave dielectric properties of the $B_2O_3$ and CuO added $Ba(Mg_{1/3}Nb_{2/3})O_3$ ceramics', J. of KIEEME (in Korean), Vol. 18, No. 1, p. 38, 2005 https://doi.org/10.4313/JKEM.2005.18.1.038
  6. J.-S. Kim, E.-S. Choi, M.-K. Lee, S.-G. Bae, and Y.-H. Lee, 'Microwave dielectric properties of $0.6TiTe_3O_8-0.4MgTiO_3$ ceramics with Addition of $H_3BO_3-SnO$', J. of KIEEME (in Korean), Vol. 18, No. 1, p. 57, 2005 https://doi.org/10.4313/JKEM.2005.18.1.057
  7. S. O. Yoon, J. H. Yoon, K. S. Kim, S. H Shim, and Y. K. Pyeon, 'Microwave dielectric properties of $LiNb_3O_8$ ceramics with $TiO_2$ additions', J. Euro. Ceram. Soc., Vol. 26, p. 2031, 2006 https://doi.org/10.1016/j.jeurceramsoc.2005.09.028
  8. B. W. Hakki and P. D. Coleman, 'A dielectric resonator method of measuring inductive capacities in the millimeter range', IEEE Trans. Microwave Theory Tech., Vol. 8, No. 3, p. 402, 1960 https://doi.org/10.1109/TMTT.1960.1124749
  9. W. E. Courtney, 'Analysis and evaluation of method of measuring the samples permittivity of microwave insulators', IEEE Trans. Microwave Theory Tech., Vol. 18, No. 3, p. 476, 1970 https://doi.org/10.1109/TMTT.1970.1127271
  10. C.-L. Huang, 'Effect $V_2O_5$ and CuO additives on sintering behavior and microwave dielectric properties of $BiNbO_4$ ceramics', Journal of Materials Science, Vol. 35, p. 5441, 2000
  11. C.-L. Huang, 'The microwave dielectric properties and the microstructures of $La_2O_3$-modified $BiNbO_4$ ceramics', Jpn. J. Appl. Phys., Vol. 39, p. 3506, 2000 https://doi.org/10.1143/JJAP.39.3506