Fabrication of BaTiO3-Based Dielectrics for Ultrathin-Layer Multilayer Ceramic Capacitor Application by a Modified Coating Approach

The development of multilayer ceramic capacitor (MLCC) with base metal electrode (BME) requires precise controlling of the microstructure in a very thin dielectric layer (<1 µm). In this paper, a modified coating approach for high coverage of BaTiO3 powder for further MLCC application has been developed. The well dispersed and coated BaTiO3 powders are prepared and the relative mechanism has been discussed. Furthermore, the ultrafine grained X7R dielectric ceramics were produced by both conventional mixing and modified coating methods. Compared with the conventional mixing method, the ceramics prepared by the coating approach exhibited better TCC (the temperature coefficient of capacitance) performance, with dielectric constant over 2000 and grain size below 150 nm. In addition, it is found through the coating method the content of additives can be reduced to a relatively smaller amount than that required in conventional mixing method.

[1]  Longtu Li,et al.  Synthesis of Monodispersed Barium Titanate Nanoparticles with Narrow Size Distribution by a Modified Alkoxide-Hydroxide Sol-Precipitation Method , 2010 .

[2]  Chao Fang,et al.  Multishell structure and size effect of barium titanate nanoceramics induced by grain surface effects , 2010 .

[3]  Xiaohui Wang,et al.  Formation of Core‐Shell Structure in Ultrafine‐Grained BaTiO3‐Based Ceramics Through Nanodopant Method , 2010 .

[4]  T. Song,et al.  Preparation of Nano BaTiO3-Based Ceramics for Multilayer Ceramic Capacitor Application by Chemical Coating Method , 2009 .

[5]  Xiaohui Wang,et al.  Modeling of the core-shell microstructure of temperature-stable BaTiO3 based dielectrics for multilayer ceramic capacitors , 2008 .

[6]  Z. Gui,et al.  The structure and dielectric properties of low temperature sintering barium titanate based x7r ceramics , 2008 .

[7]  Young Tae Kim,et al.  Effects of milling condition on the formation of core-shell structure in BaTiO3 grains , 2008 .

[8]  C. Randall,et al.  Effect of Heating Rates during Sintering on the Electrical Properties of Ultra‐Thin Ni–BaTiO3 Multilayer Ceramic Capacitors , 2008 .

[9]  C. Randall,et al.  Utilization of Multiple‐Stage Sintering to Control Ni Electrode Continuity in Ultrathin Ni–BaTiO3 Multilayer Capacitors , 2007 .

[10]  Keisuke L. I. Kobayashi,et al.  Effects of Microstructure on the Curie Temperature in BaTiO3–Ho2O3–MgO–SiO2 System , 2007 .

[11]  T. Song,et al.  Microstructures and Dielectric Characteristics of Ultrafine-Grained Barium Titanate-Based Ceramics for Base-Metal-Electrode Multilayer Ceramic Capacitors Applications , 2007 .

[12]  Rocco Alessio,et al.  Coating of BaCO3 Crystals with TiO2: Versatile Approach to the Synthesis of BaTiO3 Tetragonal Nanoparticles , 2007 .

[13]  Kang-Heon Hur,et al.  Formation of Core-Shell Structure of BaTiO3 Grains in MLCC , 2007, 2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics.

[14]  T. Lü,et al.  Size effect on the dielectric properties of BaTiO3 nanoceramics in a modified Ginsburg-Landau-Devonshire thermodynamic theory , 2006 .

[15]  D. Hennings,et al.  Temperature‐Stable Dielectrics Based on Chemically Inhomogeneous BaTiO3 , 2006 .

[16]  I. Lin,et al.  Development of X7R Type Base-Metal-Electroded BaTiO3 Capacitor Materials by Co-Doping of MgO/Y2O3 Additives , 2006 .

[17]  J. S. Park,et al.  Nano size BaTiO3 powder coated with silica , 2005 .

[18]  Doh-Yeon Kim,et al.  Core-Shell Structure of Acceptor-Rich, Coarse Barium Titanate Grains , 2004 .

[19]  Daniel E. Barber,et al.  Oxygen nonstoichiometry and dielectric evolution of BaTiO3. Part I—improvement of insulation resistance with reoxidation , 2004 .

[20]  I. Lin,et al.  Base-metal-electroded BaTiO3 capacitor materials with duplex microstructures , 2004 .

[21]  Longtu Li,et al.  Dielectric properties of BaTiO3-based ceramics sintered in reducing atmospheres prepared from nano-powders , 2004 .

[22]  H. Kamiya,et al.  Erosion Wear Properties of Pressureless Sintered TiC/Al2O3 Composites-Comparison between Pressureless Sintered Composites and Pressurized Sintered Commercial Cutting Tool Materials- , 2004 .

[23]  Hiroshi Kishi,et al.  Base-Metal Electrode-Multilayer Ceramic Capacitors: Past, Present and Future Perspectives , 2003 .

[24]  H. Ohsato,et al.  Effect of Ho/Mg Ratio on Formation of Core-shell Structure in BaTiO3 and on Dielectric Properties of BaTiO3 Ceramics , 2002 .

[25]  Y. Sakabe,et al.  Dielectric Properties of Fine-Grained BaTiO3 Ceramics Doped with CaO , 2002 .

[26]  Y. Sakabe,et al.  Base-metal electrode capacitors , 2002 .

[27]  H. Kishi,et al.  Effect of milling process on core-shell microstructure and electrical properties for BaTiO3-based Ni-MLCC , 2001 .

[28]  T. Okuda,et al.  Occupational sites and dielectric properties of rare-earth and Mn substituted BaTiO3 , 2001 .

[29]  T. Okuda,et al.  The Effect of MgO and Rare-Earth Oxide on Formation Behavior of Core-Shell Structure in BaTiO3 , 1997 .