Synthesis and Size Control of Tetragonal BaTiO3 Nano-powders by Facile Solvothermal Method

Abstract

Barium titanate (BaTiO3) has been extensively utilized in various electronic components including thermistors, sensors, electrooptical devices and multi-layer ceramic capacitors (MLCCs). For technical demands for current and the next generations, the fabrication ofthinner dielectric layers is one of the key issues for the miniaturization of these devices. Accordingly, the main challenge lies in the synthesis ofBaTi03 nanopowders of about 100 nm or less in diameter with a high dielectric constant for further downsizing ofthe dielectric layers. In this presentation, we fabricate tetragonal BaTiO3 nanopowders via a solvothermal reaction using Ti(OCH2CH2CH2CH3)4 and Ba(OH)2 as precursors. To control the size and enhance the tetragonality(c/a), an organic solvent is added in the solvothermal reaction. As-prepared BaTi03 nanopowders were characterized by X-ray diffraction, scanning electron microscopy, high-resolution TEM, and Raman spectroscopy. Based on the characterizations, it was found that the particle size could be easily tuned by a예 usting the experimental parameters, such as the solvent components. The particles have average diameters about 100 and 70 nm diameters without and with the organic solvent, respectively, and show narrow size distribution with uniform morphology. X-ray diffraction pattern (XRD) and Raman spectrum revealed that tetragonal BaTiO3 was successfully synthesized.