The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Structural and Microwave Dielectric Properties of the $Mg_5B_4O_{15}$ (B=Ta, Nb) Ceramics with Sintering Temperature

소결온도에 따른 $Mg_5B_4O_{15}$ (B=Ta, Nb)세라믹스의 구조 및 마이크로파 유전특성

  • 이승준 (광운공대 전자재료공학과) ;
  • 김재식 (광운공대 전자재료공학과) ;
  • 이성갑 (경상대학 세라믹공학과) ;
  • 이영희 (광운공대 전자재료공학과)
  • Published : 2007.03.01
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Abstract

In this study, both structural and microwave dielectric properties of the $Mg_5B_4O_{15}$ (B=Ta, Nb) cation-deficient perovskite ceramics with sintering temperature were investigated. All sample of the $Mg_5B_4O_{15}$ (B=Ta, Nb) ceramics were prepared by the conventional mixed oxide method and sintered at $1400^{\circ}C{\sim}1500^{\circ}C$. The bulk density and quality factor of the $Mg_5B_4O_{15}$ (B=Ta, Nb) ceramics were increased with increasing sinterning temperature in the range of $1400^{\circ}C{\sim}1450^{\circ}C$, but these were decreased the sintering temperature of above $1450^{\circ}C$. The dielectric constant of the $Mg_5Ta_4O_{15}$ ceramics was increased continuously with increasing sintering temperature. And the dielectric constant of the $Mg_5Nb_4O_{15}$ ceramics was increased in as the sintering temperature increasesfrom $1400^{\circ}C{\sim}1450^{\circ}C$ but was decreased at the temperatures above $1475^{\circ}C$. In the case of the $Mg_5Ta_4O_{15}\;and\;Mg_5Nb_4O_{15}$ ceramics sintered at $1450^{\circ}C$ for 5h, the dielectric constant, quality factor, and temperature coefficient of the resonant frequency (TCRF) were 8.2, 259,473 GHz, $-10.91ppm/^{\circ}C$ and 14, 37,350 GHz, $-52.3ppm/^{\circ}C$, respectively.

Keywords

References

  1. D. Kolar and D. Suvorov, 'High Permittivity Microwave Ceramics', Eur. J. Solid State Inorg. Chem, 32, pp.751-700, 1995
  2. K. Wakino, D. A. Sagala and H. Tamura, Proc. 6th Int. Meet. Ferroelectricity, Kobe, Jpn. J. Appl, Phys, 24, pp.1042, 1985
  3. 최의선, 이문기, 류기원, 배선기, 이영희, '소결온도에 따른 0.9MgTi$O_{3}$-0.1SrTi$O_{3}$ 세라믹스의 구조 및 마이크로파 유전특성', 대한전기학회논문지, Vol. 49, No.5, p294, 2000
  4. 최의선, 정장호, 류기원, 이영희, '소결온도와 Sr몰비에 따른 $Mg_{1-x}Sr_{x}TiO_{3}$ 세라믹스의 구조 및 마이크로파 유전특성', 대한전기학회논문지, Vol. 50, No.5, pp.226-231, 2001
  5. R. Ratheesh, H. Sreemoolanadhan, and M. T. Sebastian, 'Vibrational Analysis of $Ba_{5-x}Sr_{x}Nb_{4}O_{15}$ Microwave Dielectric Ceramic Resonators', J, Solid State Chem., 131, Issue 1, pp.2-8, 1997 https://doi.org/10.1006/jssc.1996.7240
  6. F. Galasso, L. Katz, 'Preparation ard structure of $Ba_{5}Ta_{4}O_{15}$ and related compounds',Acta Cryst., Vol. 14, pp.647, 1961
  7. B. W. Hakki et at., 'A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range', IRE Trans. on Microwave Theory and Techniques, Vol.MTT-24, No.10, 1960
  8. J, Krupka, K. Derzakowsky, B. Riddle, and JB Jarvis, 'A Dielectric Resonator for Measurements of Complex Permittivity of Low Loss Dielectric Materials as Function of Temperature,' Meas. Sci. Technol., 9, pp.1751-1761, 1998 https://doi.org/10.1088/0957-0233/9/10/015
  9. D. C. Baskin, Y. Chell, 'Phase studies in the binary system MgO-$Ta_{2}O_{5]$', J. Am. Ceram. Soc., Vol. 46, No. 4, pp.174, 1963
  10. R. Norin, C. G. Arbin, and B. Nalander, 'Note on the phase composition of MgO-$Nb_{2}O_{5}$ system', Acta Chim. Scand. 26, pp.3389-3300, 1972 https://doi.org/10.3891/acta.chem.scand.26-3389
  11. S. Pagola, R. E. Carbonio, 'Crystal Structure Refinement of $Mg_{5}Nb_{4}O_{15}$ and $Mg_{5}Ta_{4}O_{15}$ by Rietveld Analysis of Neutron Powder Diffraction Data', J. Solid State Chem, 137, pp.359-364, 1998 https://doi.org/10.1006/jssc.1998.7742
  12. S. H. R.A, P. P. Phule, 'Processing and microwave dielectric properties of barium magnesium tantalate ceramics for high-qulity-factor personal communication service filters', J. Mater. Res. 14, pp.4259-4265, 1999 https://doi.org/10.1557/JMR.1999.0577
  13. W. D. Kingery, H. K. Bowen and D. R. Uhlmann, 'Introduction to Ceramics', John Wiely & Sons, Second edition, pp.937-945, 1976