Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-29T09:02:16.305Z Has data issue: false hasContentIssue false
  • English
  • Français

Dielectric Properties and Microstructure of BaTiO3 Ceramics

Published online by Cambridge University Press:  01 February 2011

Dae-Chul Park ,
Jun-ichi Itoh ,
Isao Sakaguchi ,
Naoki Ohashi ,
Toyohiko Yano  and
Hajime Haneda
Dae-Chul Park
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science Tsukuba, Ibaraki 305-0044 Japan
Jun-ichi Itoh
Affiliation:
Mitsui Mining & Smelting Co., LTD Ageo-shi, Saitama 362-0021 Japan
Isao Sakaguchi
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science Tsukuba, Ibaraki 305-0044 Japan
Naoki Ohashi
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science Tsukuba, Ibaraki 305-0044 Japan
Toyohiko Yano
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology Meguro, Tokyo 152-8550 Japan
Hajime Haneda
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science Tsukuba, Ibaraki 305-0044 Japan
Get access

Abstract

Dielectric properties and microstructure were investigated in BaTiO3 ceramics with various additives, Ho2O3, MgO, Ho2O3/MgO, and La2O3. The dielectric constants were increased up to ∼4000 and ∼3000 at 25°C in the 1 mol% Ho-doped and 0.5 mol% Mg-doped BaTiO3 materials, respectively. The BaTiO3 material codoped with 3 mol% Ho + 1.5 mol% Mg led to increase dielectric constant up to ∼6000 at 25°C and the dielectric constant peak around Curie temperature was suppressed at temperature range of from 25°C to 125°C. The size of BaTiO3 grains depended on the content and kind of an additive. Core-shell grains and secondary phase were also dependent on an additive. Core-shell grains were formed completely in Ho-doped BaTiO3 except for 0.5 mol%, but the structure was little observed in Mg- and La-doped BaTiO3 material. Codoped BaTiO3 also formed the core-shell grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D10.33
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Yoo, H. I. and Song, C. R., “Defect structure and chemical diffusion in BaTiO3-ä”, Solid State Ionic 135 619–23 (2000)Google Scholar
2. Heywang, W., “Semiconducting Barium Titanate,” J. Mater. Sci., 6 1214–26 (1971)Google Scholar
3. Urek, S. and Drofenik, M., “PTCR Behaviour of Highly Donor Doped BaTiO3 ,” J. Euro. Ceram. Soc., 19 913–16 (1999)Google Scholar
4. Molokhia, N. M., Issa, M. A. A., and Nasser, S. A., “Dielectric and X-ray diffraction Studies of Barium Titanate Doped with Ytterbium”, J. Am. Cera. Soc., 67 [4[ 289–91 (1986)Google Scholar
5. Kutty, T. R. N., and Murugaraj, P., “Phase Relations and Dielectric Properties of BaTiO3 Ceramics Heavily Substituted with Neodymium,” J. Matter. Sci., 22 3652–64 (1987),Google Scholar
6. Kahn, M., “Influence of Grain Growth on Dielectric Properties of Nb-Doped BaTiO3 ,” J. Am. Ceram. Soc., 54 [9] 455–57 (1971)Google Scholar
7. Chazono, H. and Kishi, H., “Sintering characteristics in the BaTiO3-Nb2O5-Co3O4 ternary system: II, Stability of so-called “core-shell” structure”, J. Am. Ceram. Soc., 83 [1] 101–106 (2000)Google Scholar
8. Randall, C. A., Wang, S. F., Laubsher, D., Dougherty, J.P., and Huebner, W., “Structure Properties Relationships in Core-Shell BaTiO3-LiF Ceramics,” J. Mater. Res., 8 [4] 871–79 (1993)Google Scholar
9. Hwang, J. H. and Han, Y. H., “Defect chemistry of Er-doped BaTiO3 ”, Solid state Ionic 140 181–86 (2001)Google Scholar
10. Watanabe, K., Ohsato, H., H.Kishi, Okino, Y., Kohzu, N., Iguchi, Y. and Okuda, T., “Solubility of La-Mg and La-Al in BaTiO3 ”, Solid State Ionics, 108 129–135 (1998)Google Scholar
11. Kishi, H., Kohzu, N., Mizuno, Y., Iguchi, Y., Sugino, J., “Effect of Occupational Site of Rare-Earth Elements on the Microstructure in BaTiO3 ” Jpn. J. Appl. Phys., 38 5452–56 (1999)Google Scholar
12. Brixner, L. H., “Preparation and Properties o the Ln2Ti2O7-Type Rare Earth Titanates,” Inorganic Chemistry 3 [7] 1065–67 (1964)Google Scholar
13. Rawal, B. S., Kahn, M., and Buessem, W. R., “Grain Core-Grain Shell structures in BaTiO3 Based Dielectric,” in Advances in Ceramics Vol. 1, edited by Levinson, L. M.. American Ceramic Society, Westerville, OH, 1981 Google Scholar
14. Henning, D. and Rosenstein, G., J. Am. Ceram. Soc., 73 [12], 3562–68 (1990)Google Scholar
15. Kishi, H., Okino, Y., Honda, M., Iguchi, Y., Imaeda, M., Takahashi, Y., Ohsato, H. and Okuda, T., “The Effect of MgO and Rare-Earth Oxide on Formation Behavior of Core-Shell Structure in BaTiO3 ,” Jpn. J. Appl. Phys., 36 No. 9B 5954–57(1997)Google Scholar