Direct synthesis of ultrafine tetragonal BaTiO3 nanoparticles at room temperature.

Jian Quan Qi,Yu Wang,Yong Ming Hu,Ce Wen Nan,Li Sun,Tao Peng,Helen Lai Wah Chan,Wan Ping Chen,Long Tu Li

doi:10.1186/1556-276x-6-466

Abstract

A large quantity of ultrafine tetragonal barium titanate (BaTiO3) nanoparticles is directly synthesized at room temperature. The crystalline form and grain size are checked by both X-ray diffraction and transmission electron microscopy. The results revealed that the perovskite nanoparticles as fine as 7 nm have been synthesized. The phase transition of the as-prepared nanoparticles is investigated by the temperature-dependent Raman spectrum and shows the similar tendency to that of bulk BaTiO3 materials. It is confirmed that the nanoparticles have tetragonal phase at room temperature.

Highlights

Barium titanate (BaTiO3) is widely used for electronic devices in the technological ceramic industry because of its ferroelectric, thermoelectric, and piezoelectric properties when it assumes the tetragonal structure [1]
A large quantity (23.0 g) of barium titanate nanoparticles is directly synthesized at room temperature
The Raman spectroscopy clearly shows that the nanoparticles prepared from our method show the normal phase transition as bulk BaTiO3 materials and have tetragonal Raman behavior at room temperature even when the grain size is as small as 7 nm

Summary

Introduction

Barium titanate (BaTiO3) is widely used for electronic devices in the technological ceramic industry because of its ferroelectric, thermoelectric, and piezoelectric properties when it assumes the tetragonal structure [1]. As such, it can be widely used in capacitors, positive temperature coefficient resistors, dynamic random access memories, electromechanics, and nonlinear optics [2,3]. Many novel synthesis techniques have been developed for this important material. To avoid high pressure during synthesis, the thermal decompositions of a metal-organic precursor were developed to prepare the nanostructures of BaTiO3, SrTiO3, BaZrO3, and their solid-state solution at

Methods

Results

Conclusion