Microwave hydrothermal synthesis of barium titanate powders

Guo, Litong; Luo, Hongjie; Gao, Jiyun; Guo, Lizhi; Yang, Jianyi

doi:10.1016/j.matlet.2006.02.035

Cited by 68 publications

(42 citation statements)

References 10 publications

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“…At all values of r T , the ratio of the volume of nanosized particles (size less than 1 µm) to the total volume of all the particles produced (V np /(V p ) 0 ) gradually increases during microwave irradiation; however, this increase is not prominent during thermostat bath heating. This is probably because of the rapid nucleation caused by the hot spots generated during microwave irradiation (Rodriguez-Clemente and Gomez-Morales 1996; Torrent- Burgues et al, 1999;Guo et al, 2006). 2.3 Reactive crystallization of Li 2 CO 3 by microwave irradiation of the solution containing CO 2 microbubbles 2.3.1 Effect of r T on particle size distribution of Li 2 CO 3 at a constant d bbl of 25 µm…”

Section: Resultsmentioning

confidence: 99%

“…During microwave irradiation, local hightemperature regions (hot-spots) are formed because of the vibration of polar molecules and ions, and thus, rapid and efficient internal heating is achieved. Microwave irradiation has been recently employed in the solid-phase synthesis of oxides and sulfides and fine metal powders, fabrication of superconductors and semiconductors, pyrolysis of metal-organic precursors for powder synthesis, and crystallization of inorganic compounds from solution (Wada et al, 2001;Guo et al, 2006;Heuser et al, 2007). In this study, for developing a crystallization technique that enables the control of the crystal properties of carbonates with high dissolubility by the generation of local supersaturation regions, we studied the reactive crystallization of Li 2 CO 3 using minute gas-liquid interfaces around CO 2 microbubbles activated by microwave irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

Matsumoto

Morita

Yoshinaga

et al. 2009

J. Chem. Eng. Japan

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In this study, we used minute gas-liquid interfaces around CO 2 microbubbles activated by microwave irradiation as new reaction fields and developed a crystallization technique to produce lithium carbonate (Li 2 CO 3 ) nanoparticles. At the minute gas-liquid interfaces, nucleation occurs predominantly because of the formation of numerous local supersaturation regions at higher temperatures; hence, fine-sized Li 2 CO 3 particles with a narrow size distribution are crystallized, as the Li 2 CO 3 solubility decreases sharply with an increase in temperature. Microwaves (2.45 GHz) were used to irradiate an aqueous solution containing lithium ions and CO 2 microbubbles in a waveguide-type microwave apparatus. The heating method, rate of temperature increase (r T r T r T ) and average bubble size (d bbl d bbl d bbl ) were considered as the operation parameters and varied; the combined effects of CO 2 microbubble formation and microwave irradiation on the reactive crystallization of Li 2 CO 3 nanoparticles were examined. Consequently, during microwave irradiation of the solution containing CO 2 microbubbles, the crystallization of Li 2 CO 3 nanoparticles was significantly accelerated with an increase in r T r T r T and a decrease in

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

Matsumoto

Morita

Yoshinaga

et al. 2009

J. Chem. Eng. Japan

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“…BaTiO 3 has ABO 3 (where A is Ba 2+ and B is Ti 4+ )-type perovskite structure with A at the corners, B at the center, and the O 2− at the face centers. [8] Doped and undoped barium titanate can be prepared by various methods-solidstate reaction method, [9] hydrothermal method, [10,11] sol-gel processing, [12,13] solvothermal method, [14] chemical coprecipitation method, [15] etc. [6] To obtain better dielectric results, many researchers have doped barium titanate with different elements such as lanthanum, yttrium, nickel, iron, and manganese.…”

Section: Introductionmentioning

confidence: 99%

A study of dielectric behavior of manganese doped barium titanate–polyimide composites

Kumari

Ghosh

2017

Adv Polym Technol

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In this work, a series of BaTi 1−x Mn x O 3 -polyimide films were prepared by simple solution casting method. For the preparation of composite films firstly, manganese doped barium titanate, BaTi 1−x Mn x O 3 (where x = 0.00, 0.01, 0.03, 0.05) was synthesized by sol-gel process. The effect of Mn doping on its structural and dielectric properties was nicely explained. The highest dielectric constant value of 7,104 was obtained for BaTi 0.99 Mn 0.01 O 3 (BTMn) nanoparticles with low dielectric loss value 2.44. It was observed that Mn-doping concentration on barium titanate influences its crystal structure. Improved dielectric properties were reported for nanocomposite thin films containing BaTi 0.99 Mn 0.01 O 3 and polyimide (PI). A series of five homogeneous nanocomposite films were successfully prepared and were characterized thoroughly. The dielectric properties were studied as a function of frequency and loading percentage of BTMn in PI. The dielectric constant of the BTMn/PI nanocomposite films increased from 3.23 to 8.63 with the increase in loading percentage of ceramic from 0 to 5 wt%, respectively. The nanocomposite films were flexible with good mechanical properties and the flexibility decreased with increase in loading percentage of BTMn. The films showed high thermal stability in nitrogen atmosphere up to 571°C with 10% weight loss and also exhibited high glass transition temperature up to 337°C. K E Y W O R D S dielectric properties, inorganic materials, mechanical properties, polyimides, thermal properties How to cite this article: Kumari A, Dasgupta Ghosh B. A study of dielectric behavior of manganese doped barium titanate-polyimide composites. Adv Polym

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“…By using microwave-hydrothermal method, high purity and single-phase nanopowders with a perovskite structure (e.g. BaTiO 3 , Ba 1-x Sr x TiO 3 with x = 0.1-0.4) have been synthesized at fast rate under moderate temperatures, which avoids from sintering, growing and agglomeration of the powders [8,9]. However, up to date the synthesis of bismuth ferrite nanostructures by microwave-hydrothermal process is rarely reported [10], and very few reports have associated with the nanoscale structural motifs of bismuth ferrite nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Hydrothermal Synthesis and Structural Characterization of Multiferroic Bismuth Ferrite Nanostructures

Zhu¹,

Yang²,

He³

et al. 2010

Ferroelectrics

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We report on the synthesis and structural characterization of bismuth ferrite multiferroic nanostructures, which were synthesized via microwave-hydrothermal method with a bismuth nitrate/iron nitrate mixture under alkaline conditions. Both BiFeO 3 (BFO) nanocrystallites with spherical and rectangle-like morphologies and Bi 2 Fe 4 O 9 nanowires were synthesized by microwave-hydrothermal process, and their nanoscale structural motifs were revealed by high-resolution transmission electron microscopy. The results showed that BFO nanocrystallites with rectangle-like morphology had an average width of 140 nm and length of 205 nm, and the long side grew along the [100] direction, whereas the BFO nanoparticles with spherical morphology had a particle size in the range of 15-55 nm, and nearly monodispersive behavior was observed in these nanoparticles. The synthesized Bi 2 Fe 4 O 9 nanowires growing along the [001] direction had a diameter of 40 nm and length up to about 0.5 µm.

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Microwave hydrothermal synthesis of barium titanate powders

Cited by 68 publications

References 10 publications

Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

Reactive Crystallization of Lithium Carbonate Nanoparticles by Microwave Irradiation of Aqueous Solution Containing CO2 Microbubbles

A study of dielectric behavior of manganese doped barium titanate–polyimide composites

Microwave-Hydrothermal Synthesis and Structural Characterization of Multiferroic Bismuth Ferrite Nanostructures

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