Preparation of Core-Shell Structured BaTiO 3 Powder Via Coating of Cr 2 O 3 and Mn 2 O 3

Core-shell structured BaTiO3 powders were produced via nano-coating of Cr2O3 and Mn2O3 to barium titanate powder system for MLCCs. From preliminary experiments, the optimal solution reaction condition employing using KMnO4, K2Cr2O4 and sulfur was established. Not only powders of Cr2O3 and Mn2O3 were synthesized but also their coating on BaTiO3 powders were peformed under the same reaction condition. The coating was carried out in two ways, one-step and two-step, and its results were characterized for comparison. Conclusively speaking, two oxide additives were coated onto the BaTiO3 powder surface with high quality and excellent reaction yield even under mild condition, which indicates that the contents as well as the properties of additive shell layer can be precisely controlled with rather ease.

[1]  Wen-Hsi Lee,et al.  Improvement in the Temperature Stability of a BaTiO3‐Based Multilayer Ceramic Capacitor by Constrained Sintering , 2007 .

[2]  M. Dinescu,et al.  Properties of BaTiO3 thin films deposited by radiofrequency beam discharge assisted pulsed laser deposition , 2004 .

[3]  Xun Wang,et al.  Hydrothermal reduction route to Mn(OH)2 and MnCO3 nanocrystals , 2003 .

[4]  A. Onjia,et al.  Characterization of colloidal chromia particles obtained by forced hydrolysis , 2003 .

[5]  Shenglin Jiang,et al.  Effect of heat-treatment under oxygen atmosphere on the electrical properties of BaTiO 3 thermistor , 2003 .

[6]  Frank Caruso,et al.  Nanoengineering of Particle Surfaces , 2001 .

[7]  P. McCormick,et al.  Synthesis of Cr2O3 nanoparticles by mechanochemical processing , 2000 .

[8]  M. Blesa,et al.  Structure and reactivity of colloidal metal oxide particles immersed in water , 1997 .

[9]  H. Yang,et al.  Aerosol delivery of liposome-encapsulated ciprofloxacin: aerosol characterization and efficacy against Francisella tularensis infection in mice , 1997, Antimicrobial agents and chemotherapy.

[10]  E. Matijević,et al.  Preparation and Properties of Uniform Coated Inorganic Colloidal Particles , 1988, Journal of colloid and interface science.

[11]  Hyoseok Kim,et al.  The effect of grain size on dielectric behavior of BaTiO3 based X7R materials , 1996 .

[12]  Peter G. Bruce,et al.  Synthesis of layered LiMnO2 as an electrode for rechargeable lithium batteries , 1996, Nature.

[13]  E. Matijević,et al.  Preparation and properties of uniform coated colloidal particles , 1990 .

[14]  E. Matijević,et al.  Preparation and properties of uniform coated inorganic colloidal particles. IV. Yttrium basic carbonate and yttrium oxide on hematite , 1988 .

[15]  Egon Matijević,et al.  Preparation and properties of uniform coated inorganic colloidal particles: III. Zirconium hydrous oxide on hematite☆ , 1988 .

[16]  E. Matijević,et al.  Preparation and properties of coated, uniform, inorganic colloidal particles: I. Aluminum (hydrous) oxide on hematite, chromia, and titania , 1987 .

[17]  A. M. Glass,et al.  Principles and Applications of Ferroelectrics and Related Materials , 1977 .