Browse > Article
http://dx.doi.org/10.4191/KCERS.2011.48.4.323

Electrical Properties and Temperature Stability of Dysprosium and Erbium Co-doped Barium Titanate with Perovskite Structure for X7R MLCCs  

Noh, Tai-Min (School of Materials Science and Engineering, Pusan National University)
Kim, Jin-Seong (School of Materials Science and Engineering, Pusan National University)
Ryu, Ji-Seung (National Core Research Center, Pusan National University)
Lee, Hee-Soo (School of Materials Science and Engineering, Pusan National University)
Publication Information
Abstract
The effects of $Dy_2O_3$ and $Er_2O_3$ co-doping on electrical properties and temperature stability of barium titanate ($BaTiO_3$) ceramics were investigated in terms of microstructure and structural analysis. The dielectric constant and the insulation resistance (IR) of 0.7 mol% $Dy_2O_3$ and 0.3 mol% $Er_2O_3$ co-doped dielectrics had about 60% and 20% higher than the values of undoped one, respectively, and the temperature coefficient of capacitance (TCC) met the X7R specification. The addition of $Dy_2O_3$ contributed to electrical properties caused by increase of tetragonality; however, preferential diffusion of $Dy^{3+}$ ions toward A site in $BaTiO_3$ grain exhibited an adverse effect on temperature stability by grain growth. On the other hand, The $Er_2O_3$ addition in $BaTiO_3$ could affect the TCC behavior and the IR with suppression of grain growth caused by reinforcement of grain boundary and electrical compensation. Therefore, the enhanced electrical properties and temperature stability through the co-doping could be deduced from the increase of tetragonality and the suppression of grain growth.
Keywords
$BaTiO_3$; Dysprosium; Erbium; Electrical properties; Temperature stability;
Citations & Related Records

Times Cited By SCOPUS : 0
연도 인용수 순위
  • Reference
1 G. A. Samara, "The Relaxational Properties of Compositionally Disordered $ABO_3$ Perovskite," J. Phys., 15 R367-R411 (2003).
2 Y. Pu, W. Chen, S. Chen, and Hans T. Langhammer, "Microstructure and Dielectric Properties of Dysprosium-doped Barium Titanate Ceramics," Ceramica, 51 214-18 (2005).   DOI
3 D. Y. Lu, X. Y. Sun, and M. Toda, "A Novel High-k 'Y5V' Barium Titanate Ceramics Co-doped with Lanthanum and Cerium," J. Phys. and Chem., 68 650-64 (2007).
4 H. Kishi, Y. Mizuno, and H. Chazono, "Base-metal Electrodemultilayer Ceramic Capacitors: Past, Present and Future Perspectives," Jpn. J. Appl. Phys., 42 1-15 (2003).   DOI
5 J. Nichikawa, T. Hagiwara, K. Kobayashi, Y. Mizuno, and H. Kishi, "Effects of Microstructure on the Curie Temperature in $BaTiO_3-Ho_2O_3-MgO-SiO_2$ System," Jpn. J. Appl. Phys., 46 6999-7004 (2007).   DOI
6 D. Y. Lu, M. Toda, and M. Sugano, "High-permittivity Double Rare-earth-doped Barium Titanate Ceramics with Diffuse Phase Transition," J. Am. Ceram. Soc., 89 3112-23 (2006).   DOI
7 D. Makovec, Z. Smardzija, and M. Drofenik, "Solid Solubility of Holmium, Yttrium, and Dysprosium in $BaTiO_3$," J. Am. Ceram. Soc., 87 1324-29 (2004).   DOI
8 K. J. Park, C. H. Kim, Y. J. Yoon, S. M. Song, Y. T. Kim, and K. H. Hur, "Doping Behaviors of Dysprosium, Yttrium and Holmium in $BaTiO_3$ Ceramics," J. Eur. Ceram. Soc., 29 1735-41 (2009).   DOI
9 X. H. Wang, R. Z. Chen, Z. L. Gui, and L. T. Li, "The Grain Size Effect on Dielectric Properties of $BaTiO_3$ Based Ceramics," Mater. Sci. Eng., B99 199-202 (2003).   DOI   ScienceOn
10 Y. Tsur, A. Hitomi, I. Scrymgeour, and C. A. Randall, "Site Occupancy of Rare-earth Cations in $BaTiO_3$," Jpn. J. Appl. Phys., 40 255-58 (2001).   DOI
11 R. Kirchheim, "Grain Coarsening Inhibited by Solute Segregation," Acta Mater., 50 413-19 (2002).   DOI
12 E. Rabkin, "On the Grain Size Dependent Solute and Particle Drag," Scripta Mater., 42 1199-206 (2000).   DOI