An Effect of Anion Addition on the Reaction Rate in the Solid State Reaction of BaTiO3 and an Analysis of the Reaction Process

Fujikawa, Yoshinori; Yamane, Fumikazu; Nomura, Tsuyoshi

doi:10.2497/jjspm.50.751

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…In the case of the solid-state reaction using BaCO 3 (54 nm)-TiO 2 (16 or 28 nm) or BaCO 3 (482 nm)-TiO 2 (16 nm), the extent of weight loss at around 660 • C is reported to strongly depend on the TiO 2 particle size [4]. The DTG curve profile obtained for BaCO 3 (54 nm)-TiO 2 (16 or 28 nm) [4] was similar to the DTG curve of BC-TOP obtained by using B and C. The formation of BaTiO 3 through the solid-state reaction between BaCO 3 and TiO 2 follows the following reaction scheme [8,34,35]:…”

Section: Effect Of Baco 3 Particle Size On the Formation Of Batiosupporting

confidence: 64%

Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Mochizuki

Tsubouchi

Sugawara

2014

Journal of Asian Ceramic Societies

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BaCO 3 particles coated with amorphous TiO 2 precursor are prepared by a wet chemical method to produce BaTiO 3 nanoparticles at low temperatures. Subsequently, we investigate the formation behavior of BaTiO 3 particles and the particle growth behavior when the precursor is subjected to heat treatment. The state of the amorphous TiO 2 coating on the surface of BaCO 3 particles depends on the concentration of NH 4 HCO 3 , and the optimum concentration is found to be in the range 0.5-1.0 M. Thermogravimetric curves of the BaCO 3 particles coated with the TiO 2 precursor, prepared from BaCO 3 particles of various sizes, show BaTiO 3 formation occurring mainly at 550-650 • C in the case of fine BaCO 3 particles. However, as evidenced from the curves, the temperature of formation of BaTiO 3 shifts to higher values with an increase in the size of the BaCO 3 particles. The average particle size of single phase BaTiO 3 at heat-treatment temperature of 650-900 • C is observed to be in the range 60-250 nm.

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Section: Effect Of Baco 3 Particle Size On the Formation Of Batiosupporting

confidence: 64%

Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Mochizuki

Tsubouchi

Sugawara

2014

Journal of Asian Ceramic Societies

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“…These results suggest that barium and oxygen ions diffuse into the TiO 2 rutile lattice from BaCO 3 , as reported. 6,7) The microstructure of a typical surface layer on the rutile TiO 2 particle in this sample is shown in Fig. 2 The nanoprobe STEM/EDS analysis showed that the Ba/Ti molar ratio was approximately unity on the surface BaTiO 3 layer, and it rapidly decreased at the BaTiO 3 /TiO 2 interface.…”

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confidence: 92%

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confidence: 99%

“…[3][4][5][6] Niepce and Thomas 6) have elucidated that the kinetics of BaTiO 3 synthesis can be explained by multistep reactions as follows: (1) BaTiO 3 is formed, (2) Ba 2 TiO 4 (orthotitanate) is produced from BaTiO 3 and BaCO 3 , and (3) Ba 2 TiO 4 combines with the remaining TiO 2 to form BaTiO 3 . Fujikawa et al 7) have reported the microstructural change and element distribution in solid-state reaction by using scanning transmission electron microscopy (STEM) and energy dispersive spectroscopy (EDS), which showed that BaTiO 3 surrounded by TiO 2 particles was formed without forming intermediate phases such as Ba 2 TiO 4 . In order to clarify microstructural details such as orientation relationship between BaTiO 3 and TiO 2 , many modeled investigations have been carried out using planar poly-and single-crystalline solid-solid reaction couples.…”

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confidence: 99%

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Microstructure Analysis of Solid-State Reaction in Synthesis of BaTiO₃Powder Using Transmission Electron Microscope

Kobayashi

Suzuki

Mizuno

2008

Appl. Phys. Express

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The kinetics and mechanism of the solid-state reaction in BaTiO3 powder synthesis were investigated microstructurally. An equimolar mixture of BaCO3 and TiO2 (rutile) powders calcinated at 600 and 800 °C in air was observed by using transmission electron microscopy (TEM). During the reaction, layered BaTiO3 was formed over the TiO2 particles with a structurally and compositionally sharp interface. The crystallographic orientation relationship between TiO2 and BaTiO3 was universally observed as [001]TiO2 ∥[110]BTO, (100)TiO2 ∥(111)BTO. The perovskite phase BaTiO3 was formed by inward diffusion of barium and oxygen ions into the rutile lattice, maintaining a topotaxial relationship with the rutile structure.

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“…BT has four modifications of rhombohedral, orthorhombic, tetragonal and cubic phases, and the ferroelectric Curie temperature is 132°C at which the tetragonal symmetry changes to the cubic one. Powder sample of BT is easily prepared by high temperature solid state reaction 2) 4) or hydrothermal reaction, 5)8) however, lower temperature solid state reaction or milder hydrothermal condition produces the BT with a cubic symmetry which is a metastable phase stabilized by defects or OH ¹ in the crystallite or the presence of a surface layer.…”

Section: Introductionmentioning

confidence: 99%

Low temperature synthesis of tetragonal BaTiO3 by using molten salt

Kumada

Ogiso

Wada

et al. 2010

J. Ceram. Soc. Japan

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Tetragonal BaTiO 3 was prepared by reaction of a layered K 2 Ti 2 O 5 and mixed barium salts (BaCl 2 + Ba(NO 3 ) 2 ) at above 700°C. The morphology of the particle was cubic shape and the particle size of the products prepared at 7001000°C was ³10 µm, and that of the products prepared at higher temperatures (11001200°C) was smaller than that of the products prepared at 700 1000°C. From the chemical analysis no potassium atom was detected and the Ba/Ti ratio in the tetragonal BaTiO 3 was 1.00. In the cubic particle of the tetragonal BaTiO 3 surface 90°domain boundaries were observed. Lattice parameters and Curie temperature of the tetragonal BaTiO 3 were a = 3.995(1) and c = 4.036(1) ¡ and 130°C, respectively.

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An Effect of Anion Addition on the Reaction Rate in the Solid State Reaction of BaTiO3 and an Analysis of the Reaction Process

Cited by 12 publications

References 2 publications

Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Microstructure Analysis of Solid-State Reaction in Synthesis of BaTiO₃Powder Using Transmission Electron Microscope

Low temperature synthesis of tetragonal BaTiO3 by using molten salt

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An Effect of Anion Addition on the Reaction Rate in the Solid State Reaction of BaTiO3 and an Analysis of the Reaction Process

Cited by 12 publications

References 2 publications

Synthesis of BaTiO3 nanoparticles from TiO2-coated BaCO3 particles derived using a wet-chemical method

Synthesis of BaTiO3 nanoparticles from TiO2-coated BaCO3 particles derived using a wet-chemical method

Microstructure Analysis of Solid-State Reaction in Synthesis of BaTiO3Powder Using Transmission Electron Microscope

Low temperature synthesis of tetragonal BaTiO3 by using molten salt

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Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Synthesis of BaTiO₃ nanoparticles from TiO₂-coated BaCO₃ particles derived using a wet-chemical method

Microstructure Analysis of Solid-State Reaction in Synthesis of BaTiO₃Powder Using Transmission Electron Microscope