Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Sintering Time on Microwave Dielectric Properties of Layered Mg0.93Ca0.07TiO3-(Ca0.3Li0.14Sm0.42)TiO3 Ceramics

소결시간에 따른 적층형 Mg0.93Ca0.07TiO3-(Ca0.3Li0.14Sm0.42)TiO3 세라믹스의 마이크로파 유전특성

  • Cho, Joon-Yeob (Department of Ceramic Engineering, Yonsei University) ;
  • Yoon, Ki-Hyun (Department of Ceramic Engineering, Yonsei University) ;
  • Kim, Eung-Soo (Department of Materials Engineering, Kyonggi University) ;
  • Kim, Tae-Hong (Information Technology Research Group, Electronics and Telecommunications Research Institute)
  • 조준엽 (연세대학교 세라믹공학과) ;
  • 윤기현 (연세대학교 세라믹공학과) ;
  • 김응수 (경기대학교 재료공학과) ;
  • 김태홍 (한국전자통신연구원 정보화기술연구소)
  • Published : 2002.01.01
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Abstract

Effect of the sintering time on the microwave dielectric properties of the layered Functionally Graded Materials(FGMs) of the Mg0.93Ca0.07TiO3(MCT) with (Ca0.3Li0.14Sm0.42)TiO3(CLST) ceramics was investigated. The dielectric constant of layered FGMs specimens showed a nearly constant value and did not change significantly with sintering time. The quality factor, however, was affected by the relative density and thermal stress developed in each dielectric layer. With an increase of the relative density and the decrease of the induced thermal stresses, quality factor of the layered FGMs specimens increased and the quality factor was incluenced sensitively by the change of compressive stress developed in MCT layers which had a lower thermal expansion coefficient than that of CLST. For the layered FGMs specimen sintered at 1300$^{\circ}C$ for 9h, the compressive stress developed in MCT layer showed the maximum value, which, in turn, the quality factor of the specimen was the minimum value.

$Mg_{0.93}Ca_{0.07}TiO_3(MCT)$와 $(Ca_{0.3}Li_{0.14}Sm_{0.42})TiO_3(CLST)$ 세라믹스를 적층형 경사기능재료 구조로 제조한 뒤 소결시간에 따른 마이크로파 유전특성의 변화를 고찰하였다. 소결시간의 변화에 대하여 유전상수는 거의 일정한 값을 유지하였으나, 품질계수는 밀도와 각 유전체 층에 인가되는 열응력의 변화에 의해 영향을 받았다. 적층형 시편의 밀도가 증가할수록, 각유전체 층에 작용하는 열응력이 감소함에 따라 전체 품질계수 값은 증가하였으며, CLST 보다 열팽창 계수가 작은 MCT층에 인가되는 압축응력의 변화에 대하여 품질계수 값은 민감하게 영향을 받았다. 1300$^{\circ}C$에서 9시간 소결한 적층형 경사기능재료 구조의 시편의 MCT층에 가장 큰 압축응력이 인가되었으며, 이 때 가장 낮은 품질계수를 나타냈다.

Keywords

References

  1. J. Takahashi, K. Kageyama and K. Kodaira, 'Microwave Dielectric Properties of Lanthanide Titanate Ceramics,' Jpn. J. Appl. Phys., 32 [9B] 4327-31 (1993) https://doi.org/10.1143/JJAP.32.4327
  2. K. H. Yoon, Y. S. Ahn, W. S. Kim and E. S. Kim, 'Microwave Dielectric Properties and Infrared Reflectivity Spectra of ($Zn_{0.8}Sn_{0.2}$)$TiO_4$ Ceramics,' J. Kor. Ceram. Soc., 36 [9] 915-22 (1999)
  3. A. J. Markworth and J. H. Saunders, 'A Model of Structure Optimization for a Functionally Graded Material,' Mater. Lett., 22 103-07 (1995) https://doi.org/10.1016/0167-577X(94)00238-X
  4. S. Suresh and A. Mortensen, Fundamentals of Functionally Graded Materials Processing and Thermomechanical Behavior of Graded Matals and Metal-ceramic Composite, pp. 3-11, IOM Communications Ltd., London, 1998
  5. W. Chang, J. S. Horwitz, A. C. Carter, J. M. Pond, S. W. Kirchoefer, C. M. Gilmore and D. B. Chrisey, 'The Effect of Annealing on the Microwave Properties of $Ba_{0.5}Sr_{0.5}TiO_{3}$ Thin Films,' Appl. Phys. Lett., 74 [7] 1033-35 (1999) https://doi.org/10.1063/1.123446
  6. T. Kim, J. Oh, B. Park and K. S. Hong, 'Correlation between Strain and Dielectric Properties in $ZrTiO_4$ Thin Films,' Appl. Phys. Lett., 76 [21] 3043-45 (1999) https://doi.org/10.1063/1.126573
  7. D-W. Lee, J-H. Park, I-T. Kim, J-G. Park, Y. Kim and D-K. Choi, 'Effects of $B_2$ $O_3$ Addition on the Sintering Behavior and the Microwave Dielectric Properties of ($Mg_{0.93}Ca_{0.07}) TiO_3$ Ceramics,' J. Kor. Ceram. Soc., 35 [3] 287-93 (1998)
  8. D. C. Woo, H. Y. Lee, J-H. Han, T-H. Kim and T-G. Choy, 'Effect of Dopants on the Microwave Dielectric Properties of (1-x)$MgTiO_3-xCaTiO_3$ Ceramics,' J. Kor. Ceram. Soc., 34 [8] 843-57 (1997)
  9. J. Petzelt, S. Pacesova, J. Fousek, S. Kamba, V. Zelezny, V. Koukal, J. Schwarzbach, B. P. Gorshunov, G. V. Kozolov and A. A. Volkov, 'Dielectric Spectra of Some Ceramics for Microwave Applications in the Range of $10^{10}-10^{14}$ Hz,' Ferroelectrics, 93 77-85 (1989) https://doi.org/10.1080/00150198908017327
  10. W. S. Kim, E. S. Kim and K. H. Yoon, 'Effect of $Sm^{3+}$ Substitution on Dielectric Properties $Ca_{1-x}Sm_{2x/3}TiO_3$ Ceramics at Microwave Frequencies,' J. Am. Ceram. Soc., 82 [8]2111-15 (1999) https://doi.org/10.1111/j.1151-2916.1999.tb02049.x
  11. J. R. Barber, Elasticity, pp. 3-19, Kluwer Academic Publishers, Dordrecht, 1992
  12. L. H. Van Vlack, 'Deformation and Fracture'; pp 251-80 in Elements of Materials Science and Engineering, 6th Edit., Addison-wesley Publishing Company, Massachusetts, 1989
  13. B. W. Hakki and P. D. Coleman, 'A Dielectric Method of Measuring Inductive Capacitance in the Millimeter Range,' 1EEE Trans. Microwave Theory Tech., 8 402-10 (1960) https://doi.org/10.1109/TMTT.1960.1124749
  14. Y. Kobayashi and S. Tanaka, 'Measurement of Complex Dielectric Constant by Columnar Dielectric Resonator,' Tech. Rept. CPM 72-33, Institute of Electron and Communication Engineers of Japan (1972)
  15. V. M. Ferreira, F. Azough, J. L. Baptista and R. Freer, 'Magnesium Titanate Microwave Dielectric Ceramics,' Ferroelectrics, 133 127-32 (1992) https://doi.org/10.1080/00150199208217987
  16. S. Hirano, T. Hayashi and A. Hattori, 'Chemical Processing and Microwave Characteristics of ($Zr_{0.8}Sn_{0.2})TiO_4$ Microwave Dielectrics,' J. Am. Ceram. Soc., 74 [6] 1320-24 (1991) https://doi.org/10.1111/j.1151-2916.1991.tb04105.x
  17. M. Takata and K. Kageyama, 'Microwave Characteristics of A($B_1_/_2^+^3$$B_1_/_2^+^5)O_3$ Ceramics (A=Ba, Ca, Sr:$B^{+3}$=La, Nd, Sm, Yb: $B^5$=Nb, Ta),' J. Am. Ceram. Soc., 11 [10] 1955-59 (1989)
  18. K. Endo, K. Fujimoto and K. Murakawa, 'Dielectric Properties of ceramics in Ba($Co_{1/3}Nb_{2/3})O_3$-Ba($Zn_{1/3}Nb_{2/3})2/3)O_3$ Solid Solution,' J. Am. Ceram. Soc., 70 [9] C215-17 (1987)
  19. S. Kucheiko, 'Microwave Dielectric Properties of $CaTiO_{3-}$ Ca($Al_{1/2}Ta_{1/2})O_3$ Ceramics,' J. Am. Ceram. Soc., 79 [10] 2739-43 (1989) https://doi.org/10.1111/j.1151-2916.1996.tb09040.x
  20. E. Suhir, 'Predicted Thermal Stresses in a Bimaterial Assembly Adhesively Bonded at the Ends,' J. Appl. Phys., 89 [1] 120-29 (2000)
  21. C. A. Klein and R. P. Miller, 'Strains and Stresses in Multilayered Elastic Structures: The Case of Chemically VaporDeposited ZnS/ZnSe Laminates,' J. Appl. Phys., 87 [5] 2265-72 (2000) https://doi.org/10.1063/1.372171
  22. B. F. S$\phi$rensen, S. Sarraute, O. J$\phi$rgensen and A. Horsewell, 'Thermally Induced Delamination of Multilayers,' Acta Mater., 46 [8] 2603-15 (1998) https://doi.org/10.1016/S1359-6454(97)00472-2
  23. K. H. Yoon, M. S. Park and E. S. Kim, 'Microwave Dielectric Properties and Far-IR Refractivity of ($Ca_{0.275}Sm_{0.4}Li_{0.25}$) ($Ti_{1-x}Mn_{x})O_3$, Ceramics,' Ferroelectrics, 262 173-78 (2001) https://doi.org/10.1080/00150190108225145