한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제46권2호
  • /
  • Pages.123-130
  • /
  • 2009
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지
DOI QR코드

DOI QR Code

Formation of Core-Shell Structure in BaTiO3 Grains

  • Kim, Chang-Hoon (LCR Material Development Group, Samsung Electro-Mechanics) ;
  • Park, Kum-Jin (LCR Material Development Group, Samsung Electro-Mechanics) ;
  • Yoon, Yeo-Joo (Analytical Research Group, Samsung Electro-Mechanics) ;
  • Kim, Young-Tae (LCR Material Development Group, Samsung Electro-Mechanics) ;
  • Hur, Kang-Heon (LCR Development Team, Samsung Electro-Mechanics)
  • 발행 : 2009.03.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

To understand the formation of core-shell structure in $BaTiO_3$ (BT) grains in multilayer ceramic capacitors, specimens were prepared with BT powders mixed with Y and Mg, and their microstructures were investigated with scanning electron microscopy, x-ray diffractometry, and transmission electron microscopy. Microstructural investigation showed that Y dissolved easily in BT lattice to a certain depth inside of the grain, whereas Mg tended to stay at grain boundaries rather than become incorporated into BT. It was considered that in case of Y and Mg addition in a proper ratio, Y could play a dominant role in the formation of shell leading to a slight dissolution of Mg in the shell. Next, the effects of ball-milling conditions on the core-shell formation were studied. As the ball-milling time increased, the milled powders did not show a significant change in size distribution but rather an increase of residual strain, which was attributed to the milling damage. The increase in milling damage facilitated the shell formation, leading to the increased shell portion in the core-shell grain.

키워드

참고문헌

  1. D. Hennings and G. Rosenstein, “Temperature-stable Dielectrics based on Chemically Inhomogeneous BaTiO3,” J. Am. Ceram. Soc., 67 249-54 (1984). https://doi.org/10.1111/j.1151-2916.1984.tb18841.x
  2. C. A. Randall, S. F. Wang, D. Laubscher, J. P. Dougherty, and W. Huebner, “Structure Property Relationships in Core-shell $BaTiO_3$-LiF Ceramics,” J. Mater. Res., 8 [4] 871-79 (1993) https://doi.org/10.1557/JMR.1993.0871
  3. S.H. Yoon, J. H. Lee, D. Y. Kim, and N. M. Hwang, “Coreshell Structure of Acceptor-rich, Coarse Barium Titanate Grains,” J. Am. Ceram. Soc., 85 [12] 3111-13 (2002). https://doi.org/10.1111/j.1151-2916.2002.tb00593.x
  4. T. R. Armstrong and R. C. Buchanan, “Influence of Coreshell Grains on the Internal Stress State and Permittivity Response of Zirconia-modified Barium Titanate,” J. Am. Ceram. Soc., 73 [5] 1268-73 (1990). https://doi.org/10.1111/j.1151-2916.1990.tb05190.x
  5. H. Kishi, Y. Okino, M. Honda, Y. Iguchi, M. Imaeda, Y. Takahashi, H. Ohsato, and T. Okuda, “The Effect of MgO and Rare-earth Oxide on Formation Behavior of Core-shell Structure in $BaTiO_3$,” Jpn. J. Appl. Phys., 36 [9B] 5954-57 (1997). https://doi.org/10.1143/JJAP.36.5954
  6. H. Chazono and M. Fujimoto, “Sintering Characteristics and Formation Mechanisms of Core-shell Structure in $BaTiO_3$-$Nb2O_5$-$Co_3O_5$ Ternary System,” Jpn. J. Appl. Phys., 34 [9B] 5354-59 (1995). https://doi.org/10.1143/JJAP.34.5354
  7. H. Chazono and H. Kishi, “Sintering Characteristics in $BaTiO_3$-$Nb_2O_5$-$Co_3O_4$ Ternary System: I, Electrical Properties and Microstructure,” J. Am. Ceram. Soc., 82 [10] 2689-97 (1999). https://doi.org/10.1111/j.1151-2916.1999.tb02143.x
  8. W. Grogger, F. Hofer, P. Warbichler, A. Feltz, and M. Ottlinger, “Imaging of the Core-shell Structure of Doped $BaTiO_3 Ceramics by Energy Filtering TEM,” Phys. Stat. Sol., A166 315-25 (1998). https://doi.org/10.1002/(SICI)1521-396X(199803)166:1<315::AID-PSSA315>3.0.CO;2-2
  9. C. S. Chen, C. C. Chou, and I. N. Lin, “Microstructure of X7R Type Base-metal-electroded $BaTiO_3$ Capacitor Materials Co-doped with $MgO/Y_2O_3$ Additives,” J. Electroceram., 13 567-71 (2004). https://doi.org/10.1007/s10832-004-5159-y
  10. Y. Mizuno, T. Hagiwara, H. Chazono, and H. Kishi, “Effect of Milling Process on Core-shell Microstructure and Electrical Properties for $BaTiO_3$-based Ni-MLCC,” J. Eur. Ceram. Soc., 21 1649-52 (2001). https://doi.org/10.1016/S0955-2219(01)00084-X
  11. Y. Mizuno, T. Hagiwara, H. Kishi, A. Kirianov, and H. Ohsato, “Influence of the Milling Process on Microstructure and Electrical Properties for $BaTiO_3$-based Ni-MLCC,” J. Ceram. Soc. Jpn., 112 [1] S493-497 (2004).
  12. G. Arlt, D. Hennings, and G. de With, “Dielectric Properties of Fine-grained Barium Titanate Ceramics,” J. Appl. Phys., 58 1619-25 (1985). https://doi.org/10.1063/1.336051
  13. Y. Fujikawa, Y. Umeda, and F. Yamane, “Analysis on the Sintering Process of X7R MLCC Materials,” J. Jpn. Soc. Powder Powder Metallurgy, 51 839-44 (2004). https://doi.org/10.2497/jjspm.51.839
  14. J. Zhi, A. Chen, Y. Zhi, P.M. Vilarinho, and J. Baptista, “Incorporation of Yttrium in Barium Titanate Ceramics,” J. Am. Ceram. Soc., 82 1345-48 (1999). https://doi.org/10.1111/j.1151-2916.1999.tb01921.x
  15. S. Wada, M. Yano, T. Suzuki, and T. Noma, “Crystal Structure of Barium Titanate Fine Particles Including Mg and Analysis of Their Lattice Vibration,” J. Mater. Sci., 35 3889-902 (2000). https://doi.org/10.1023/A:1004841716691
  16. G. K. Williamson and W. H. Hall, “X-ray Line Broadening from Filed Aluminium and Wolfram,” Acta Metall., 1 22-31 (1953). https://doi.org/10.1016/0001-6160(53)90006-6

피인용 문헌

  1. Effects of core/shell volumetric ratio on the dielectric-temperature behavior of BaTiO3 vol.3, pp.1, 2014, https://doi.org/10.1007/s40145-014-0096-y