Barium Titanate and Barium Orthotitanate Powders Through An Ethylene Glycol Polymerization Route

Barium titanate nanoparticle (BT-NP) suspensions were prepared by dispersing sol-gel-derived BT-NPs in ethylene glycol monomethyl ether (EGMME) under sonication. When an electric field was applied, a part of the BT-NPs in a suspension was deposited on the cathode by electrophoretically deposition and most of the rest of the BT-NPs settled down towards the bottom of a container. The concentration of BT-NPs in the lower part of the container (Cbottom) increased with time until the Cbottom reached a specific concentration (threshold concentration) at which sedimentation of BT-NPs start to occur. The threshold concentration of the nanoparticles sedimentation gave a significant influence upon the aspect of a BT-NPs deposit formed on the cathode.

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Powder synthesis of barium titanate and barium orthotitanate via an ethylene glycol complex polymerization route

Journal of Materials Research ◽

10.1557/jmr.1999.0403 ◽

1999 ◽

Vol 14 (7) ◽

pp. 3001-3006 ◽

Cited By ~ 34

Author(s):

S. J. Lee ◽

M. D. Biegalski ◽

W. M. Kriven

Keyword(s):

High Temperature ◽

Barium Titanate ◽

Ethylene Glycol ◽

Orthorhombic Phase ◽

Orthorhombic Symmetry ◽

Powder Synthesis ◽

Scanning Calorimetry ◽

Powder Morphology ◽

Synthesis Of Barium Titanate ◽

Volume Decrease

Pure and reactive barium titanate (BaTiO3) and barium orthotitanate (Ba2TiO4) powders have been synthesized by an ethylene glycol (EG), polymerizationcomplexation route. The EG content affected the crystallization behavior and powder morphology. The BaTiO3powder, which had a particle size of approximately 100 nm, crystallized from amorphous to tetragonal phase on calcining at 700 °C for 1 h. Ball-milled BaTiO3 powder sintered to 97% relative density at 1200 °C after 2 h, with a grain size of approximately 200 nm. Ba2TiO4 powder required longer holding times or higher temperatures to be crystallized from the amorphous phase than did BaTiO3. In Ba2TiO4, the phase transformation between low-temperature monoclinic symmetry to high-temperature orthorhombic symmetry was observed by dilatometry and differential scanning calorimetry. A volume decrease of ∼0.5% accompanied the monoclinic-to-orthorhombic transformation on heating. The high-temperature orthorhombic phase could be retained down to room temperature y the addition of at least 6 wt% magnesia (MgO) stabilizer.

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Investigating the mechanism of catalytic reduction of silver nitrate on the surface of barium titanate at room temperature: oxygen vacancies play a key role

RSC Advances ◽

10.1039/c4ra12665c ◽

2015 ◽

Vol 5 (5) ◽

pp. 3377-3380 ◽

Cited By ~ 3

Author(s):

Suibin Luo ◽

Shuhui Yu ◽

Fang Fang ◽

Maobai Lai ◽

Rong Sun ◽

...

Keyword(s):

Barium Titanate ◽

Ethylene Glycol ◽

Silver Nitrate ◽

Room Temperature ◽

Oxygen Vacancies ◽

Catalytic Reduction ◽

Hydroxyl Oxygen

The oxygen vacancies on BaTiO3 surface linked with the hydroxyl oxygen of ethylene glycol and catalyzed the reduction of AgNO3.

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Mechanochemical Synthesis of BaTiO3 Powders and Evaluation of Their Acrylic Dispersions

Materials ◽

10.3390/ma13153275 ◽

2020 ◽

Vol 13 (15) ◽

pp. 3275

Author(s):

Sonia Kudłacik-Kramarczyk ◽

Anna Drabczyk ◽

Magdalena Głąb ◽

Piotr Dulian ◽

Rafał Bogucki ◽

...

Keyword(s):

Barium Titanate ◽

Ethylene Glycol ◽

Mechanochemical Synthesis ◽

Xrd Analysis ◽

Energy Storage And Conversion ◽

Poly Ethylene Glycol ◽

A Value ◽

Inorganic Coatings ◽

Ft Ir ◽

Poly Ethylene

Barium titanate is a ferroelectric perovskite with unique electric properties; therefore, it is widely applied in the fabrication of inorganic coatings or thin films, capacitors, or in the production of devices for energy storage and conversion. This paper describes the mechanochemical synthesis of BaTiO3 from BaO and TiO2 using a ball mill. XRD analysis allowed concluding that barium titanate was formed after 90 min of mechanochemical grinding. It was also proved by spectroscopic analysis and the band corresponding to Ti–O vibrations on obtained Fourier Transform Infrared (FT-IR) spectra. The specific surface area of obtained powder was 25.275 m2/g. Next, formed perovskite was dispersed in an acrylic poly(ethylene glycol) (superabsorbent polymer suspension, SAP) suspension prepared using microwave radiation. Final suspensions differed in the concentration of SAP applied. It was proven that the increase of SAP concentration does not affect the acidity of the suspension, but it does increase its dynamic viscosity. A sample with 83 wt.% of SAP reached a value of approximately 140 mPa∙s. Dispersions with higher values of SAP mass fraction exhibited lower sedimentation rates. Molecules such as SAP may adsorb to the surface of particles and thus prevent their agglomeration and make them well monodispersed. Based on the performed experiments, it can be concluded that acrylic poly(ethylene glycol) suspension is a suitable fluid that may stabilize barium titanate dispersions.

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The State and Optical Properties of Crystalline BaTiO3 Nanoparticles Dispersed in Various Suspension Media

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.350.51 ◽

2007 ◽

Vol 350 ◽

pp. 51-54 ◽

Cited By ~ 1

Author(s):

Mikiko Koyama ◽

Sachi Murakami ◽

Naoki Iwaji ◽

Hiromichi Takebe ◽

Makoto Kuwabara

Keyword(s):

Optical Properties ◽

Barium Titanate ◽

Ethylene Glycol ◽

Behavior Pattern ◽

Optical Transmittance ◽

Monomethyl Ether ◽

The State ◽

Ethylene Glycol Monomethyl Ether ◽

Glycol Monomethyl Ether

An investigation has been made on the state of barium titanate (BaTiO3; BTO, hereafter) nanoparticles of 10-15 nm in diameter dispersed in various suspension media, such as 2-methoxyethanol (ethylene glycol monomethyl ether: EGMME) with and without acetylacetone (Acac), ethanol, and isopropanol. The state of the nanoparticles dispersed in these suspension media is deduced from the behavior pattern of their optical transmittance (T), in the wavelength (λ) range of 300-900 nm; the concentration (c) of BTO nanoparticles in the suspensions was varied from 0.01 to 0.25 mol/L. T-c plots obtained for EGMME+Acac and EGMME suspensions at various wavelengths indicate that BTO nanoparticles take two and three different states in the suspensions, respectively, from mono-dispersed to agglomerated states with increasing c.

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