Synthesis and sintering of nanocrystalline barium titanate powder under nonisothermal conditions. III. Chromatographic analysis of barium titanyl-oxalate gaseous decomposition products

1997 ◽  
Vol 36 (11-12) ◽  
pp. 575-578 ◽  
Author(s):  
O. O. Vasyl’kiv ◽  
A. V. Ragulya ◽  
V. P. Klimenko ◽  
V. V. Skorokhod
Keyword(s):  
Barium Titanate ◽  
Chromatographic Analysis ◽  
Decomposition Products ◽  
Barium Titanate Powder ◽  
Barium Titanyl Oxalate ◽  
Nonisothermal Conditions ◽  
Titanyl Oxalate

Development of New Preparation Method for nm-Sized Barium Titanate Particles

2006 ◽  
Vol 301 ◽  
pp. 215-218 ◽  
Author(s):  
Michiyasu Nishiyama ◽  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada
Keyword(s):  
Barium Titanate ◽  
Precursor Solution ◽  
Average Diameter ◽  
Solution Concentration ◽  
Decomposition Temperature ◽  
Barium Titanyl Oxalate ◽  
Two Parameters ◽  
20 Nm ◽  
Wide Size Distribution ◽  
Titanyl Oxalate

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.

Preparation of Barium Titanate Nanoparticles by Particle Growth Control

2010 ◽  
Vol 445 ◽  
pp. 171-174 ◽  
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.

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

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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