Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Low Temperature Sintering and Microwave Dielectric Properties of Ba5Nb4O15 Ceramics

Ba5Nb4O15 세라믹스의 저온소결 및 마이크로파 유전특성

  • Kim, Jong-Dae (Department of Materials Engineering, Kyonggi University) ;
  • Kim, Eung-Soo (Department of Materials Engineering, Kyonggi University)
  • Published : 2004.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Microwave dielectric properties and the microstructure of $Ba_5Nb_4O_{15}$ ceramics with $PbO-B_2O_3-SiO_2$ glass frit were investigated to reduce the sintering temperature of $Ba_5Nb_4O_{15}$ ceramics as a function of the amount of glass frit from $0.5wt\%$ to $10wt\%$ and the sintering condition. The sintered density and the microwave dielectric properties of $Ba_5Nb_4O_{15}$ ceramics were remarkably changed with the amount of glass fit which existed as a liquid phase and assisted the densification. $Ba_5Nb_4O_{15}$ with $3wt\%$ $PbO-B_2O_3-SiO_2$ glass frit sintered at $900^{\circ}C$ for 2 h showed dielectric constant (K) of 41.4, a quality factor (Q $\times$f) of 13,485 GHz, and a Temperature Coefficient of resonant Frequency (TCF) of 9 ppm/$^{\circ}C$. Due to no trace of physical and chemical reaction between this composition and Ag electrode cofired at $900^{\circ}C$ for 2 h, this ceramics can be a good candidate for the multilayer dielectric filter.

[ $Ba_5Nb_4O_{15}$ ] 세라믹스의 소결 온도를 낮추기 위하여 $PbO-B_2O_3-SiO_2$계 glass frit를 $0.5\~10w\%$ 첨가하고 소결 조건 변화에 따른 마이크로파 유전특성과 미세구조를 조사하였다. $Ba_5Nb_4O_{15}$ 유전체의 소결 밀도와 마이크로파 유전특성은 액상 소결조제로서 첨가한 glass frit의 첨가량에 따라 크게 변화하였다. $PbO-B_2O_3-SiO_2$계 glass frit을 $3wt\%$ 첨가하고 $900^{\circ}C$에서 2시간 소결한 시편은 유전상수(K) 41.4, 품질계수(Q$\times$f) 13,485 GHz, 공진주파수 온도계수(TCF) 9 ppm/$^{\circ}C$의 마이크로파 유전특성을 나타내었다. 또한, 상기 조성의 유전체 재료는 Ag 전극과의 동시소결에도 물리, 화학적 반응이 없어 적층형 유전체 필터 재료로서 적합한 재료라고 판단된다.

Keywords

References

  1. W. Wersing, 'High Frequency Ceramic Dielectric and their Applications for Microwave Components,' in ElectronicsCeramics, Ed. By B.C.H. Steel, Elsevier Science Pub. Ltd., Ch. 4, 67-119 (1991)
  2. J. Plourde and C. L. Ren, 'Application of Dielectric Res onators in Microwave Components,' IEEE Trans. Micro wave Theary Tech., MTT 754-70 (1981)
  3. P. Liu, E. S. Kim, and K. H. Yoon, 'Low-Temperature Sin- tehng and Microwave Dielectric Properties of Ca($Li_{1/3}NbP_{2/3}$) $O_{3-8} $Ceramics,' Jpn. J. AppI. Phys., 40 [9B] 5769-73 (2001) https://doi.org/10.1143/JJAP.40.5769
  4. S. Hirano, T. Hayashi, and A. Hattori, 'Chemical Processing and Microwave Characteristics of (Zr,Sn)Ti0_4 Microwave Dielectrics,' J. Am. Ceram. Soc., 74 [6] 1320-24 (1991) https://doi.org/10.1111/j.1151-2916.1991.tb04105.x
  5. J. H. Jean and S. C. Lin, 'Low-Fire Processing of ZrO_2- SnO_2-TiO_2 Ceramics,' J. Am. Ceram. Soc., 83 [6] 1417-22 (2000) https://doi.org/10.1111/j.1151-2916.2000.tb01404.x
  6. H. Sreemoolanadhan, M. T. Sebastian, and P. Mohanan, 'High Permittivity and Low Loss Ceramics in the BaO-SrO- NbzO_5, System' Mater. Res. Bull., 30 [6] 653-58 (1995) https://doi.org/10.1016/0025-5408(95)00070-4
  7. C. Vineis, P. K. Davis, T. Negas, and S. Bell, 'Microwave Dielecthc Properties of Hexagonal Perovskites,' Mater. Res. BuIt., 31 [5] 431-37 (1996) https://doi.org/10.1016/S0025-5408(96)00028-1
  8. W. H. Jung, J. H. Sohn, Y. Inaguma, and M. Itoh, $Ba_5Nb_4O_{15}$ Ceramics with Temperature-Stable High Dielectric Constant and Low Microwave Loss,' Kor. J. Ceram., 2 [2] 111-13 (1996)
  9. R. Ratheesh, M. T. Sebastian, P. Mohanan, M. E. Tobar, J. Hamett, R. Woode, and D. G. Blair, 'Microwave Chara- tehzation of $BaCe_2Ti_50_{15}\;and\;Ba_5Nb4_15$Ceramics Dielec- trie Resonators Using Whispering Gallery Mode Method,' Mater. Lett., 45 279-85 (2000) https://doi.org/10.1016/S0167-577X(00)00118-X
  10. D. W. Kim, J. R. Kim, S. H. Yoon, K. S. Hong, and C. K. Kim, 'Microwave Dielectric Properties of Low-Fired $Ba_5Nb_4O_{15}$,' J. Am. Ceram. Soc., 85 [11] 2759-62 (2002) https://doi.org/10.1111/j.1151-2916.2002.tb00525.x
  11. C. L. Huang, M. H. Weng, C. T. Lion, and C. C. Wu, 'Low Ternperature Sintering and Microwave Dielectric Properties of BazTigOzo Ceramics Using Glass Additions,' Mater. Res. Bull., 35 2445-56 (2000) https://doi.org/10.1016/S0025-5408(00)00432-3
  12. R. Roth, Phase Diagrams for Ceramists; Vol. 11 pp. 340, The American Ceramic Society, Ohio (1995)
  13. T. A. Vanderah, T. R. Collins, W. Wong-Ng, R. S. Roth, and L. Farber, 'Phase Equilibria and Crystal Chemistry in the $BaO-Al_2O_3-Nb_2O_5$ and $BaO-Nb_2O_5$ Systems,' J. All. Comp., 346 116-28 (2002) https://doi.org/10.1016/S0925-8388(02)00520-0