Alternative Route for Synthesis of Barium Titanyl Oxalate: Molecular Precursor for Macrocrystalline Barium Titanate Powders

A new method for ultrafine barium titanate (BaTiO3) particles with diameters of around 5 nm is proposed. In this method, barium titanyl oxalate aqua solution with low concentration below 10-3 mol/l was used as the starting material. The droplets with a size below 3 μm were atomized with an ultrasonic vibrator, dried and thermally decomposed at higher temperatures over 300°C. In the preparation of the BaTiO3 particles, there were two parameters such as thermal decomposition temperature and precursor solution concentration. Therefore, various particles were prepared by changing these parameters. Finally, non-aggregated nm-sized BaTiO3 particles with an average diameter of 5.2 nm, despite wide size distribution from 2 to 20 nm, were prepared by using the precursor solution with 10-6 mol/l.

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Properties of barium titanate powders in relation to the heat treatment of the barium titanyl oxalate precursor

Inorganic Materials ◽

10.1134/s0020168512060167 ◽

2012 ◽

Vol 48 (6) ◽

pp. 613-618 ◽

Cited By ~ 5

Author(s):

V. N. Shut ◽

S. V. Kostomarov

Keyword(s):

Heat Treatment ◽

Barium Titanate ◽

Oxalate Precursor ◽

Barium Titanyl Oxalate ◽

Titanyl Oxalate

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Preparation of Barium Titanate Nanoparticles by Particle Growth Control

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.445.171 ◽

2010 ◽

Vol 445 ◽

pp. 171-174 ◽

Cited By ~ 1

Author(s):

Shuhei Kondo ◽

Tatsuya Kita ◽

Petr Pulpan ◽

Chikako Moriyoshi ◽

Yoshihiro Kuroiwa ◽

...

Keyword(s):

Growth Rate ◽

Barium Titanate ◽

Layer Thickness ◽

Growth Control ◽

Particle Growth ◽

Particle Structure ◽

Barium Titanyl Oxalate ◽

Jet Milling ◽

Titanyl Oxalate ◽

Batio3 Nanoparticles

Barium titanate (BaTiO3) nanoparticles were prepared by a two-step thermal　decomposition method using barium titanyl oxalate nanoparticles of size 30 nm with and without dry-jet milling. Dry-jet milled barium titanyl oxalate nanoparticles (BTO-B) were well-dispersed whereas those without the dry-jet milling procedure (BTO-A) were partially aggregated. A heat annealing of obtained BaTiO3 nanoparticles at the same temperature resulted in crystallite sizes of the BTO-A derived BaTiO3 nanoparticles much smaller than those of the BTO-B derived. A mesoscopic particle structure analysis of revealed much thinner surface cubic layer thickness of the BTO-B derived BaTiO3 nanoparticles compared with the BTO-A derived BaTiO3 nanoparticles. This indicated the particle growth rate to be the most important parameter for the surface cubic layer thickness determination. A relationship between the surface cubic layer thickness and the particle growth rate was investigated precisely in this study.

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Preparation and Characterization of Highly-Dispersed and Highly-Crystalline Barium Titanate Nanoparticles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.566.273 ◽

2013 ◽

Vol 566 ◽

pp. 273-276

Author(s):

Tatsuya Kita ◽

Takahiro Takei ◽

Nobuhiro Kumada ◽

Kouichi Nakashima ◽

Ichiro Fujii ◽

...

Keyword(s):

Barium Titanate ◽

X Ray Diffraction ◽

Reduced Pressure ◽

Barium Titanyl Oxalate ◽

Highly Dispersed ◽

Particle Size And Morphology ◽

Size And Morphology ◽

Barium Titanate Nanoparticles ◽

Titanyl Oxalate

Highly dispersed barium titanate (BaTiO3, BT) nanoparticles were prepared by the new 2-step thermal decomposition method of barium titanyl oxalate of 30 nm in size. The nanoparticles were heated at 450 °C for 5 hours in air to yield intermediate product: Ba2Ti2O5CO3. Highly dispersed BaTiO3 nanoparticles were prepared by rotationally stirring it at the reduced pressure of 0.2 Pa at various temperatures between 800 °C and 900 °C. The particle size and morphology of the BaTiO3 nanoparticles were investigated by X-ray diffraction and scanning electron microscopy. These measurements showed that the BT nanoparticles were highly dispersed and well-crystallized.

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