Journal of Materials Research

Articles

Synthesis of nanotabular barium titanate via a hydrothermal route

Timothy J. Yosenicka1, David V. Millera2, Rajneesh Kumara3, Jennifer A. Nelsona3, Clive A. Randalla3 and James H. Adaira3

a1 NSF Particulate Materials Center, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802

a2 Bectel-Bettis, West Mifflin, Pennsylvania 15122

a3 NSF Particulate Materials Center, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802

Abstract

As layer thickness of multilayer ceramic capacitors decreases, nanoparticles of high dielectric materials, especially BaTiO3, are needed. Tabular metal nanoparticles produce thin metal layers with low surface roughness via electrophoretic deposition. To achieve similar results in dielectric layers requires the synthesis and dispersion of tabular BaTiO3 nanoparticles. In the current study, the synthesis of BaTiO3 was investigated using a hydrothermal route. Transmission electron microscopy and atomic force microscpy analyses show that the synthesized particles are single crystal with a 〈111〉 zone axis and a median thickness of 5.8 nm and face diameter of 27.1 nm. Particle growth is likely controlled by the formation of {111} twins and the synthesis pH, which stabilizes the {111} face during growth. With limited growth in the 〈111〉 direction, the particles develop a platelike morphology. Physical property characterization shows the powder is of high purity with low hydrothermal defect concentrations and controlled stoichiometry.

(Received November 09 2004)

(Accepted December 22 2004)

(Online publication April 2005)

Key Words:

  • Ferroelectric;
  • Hydrothermal;
  • Nanoparticle
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