Microwave-hydrothermal processing for synthesis of electroceramic powders

Komarneni, Sridhar; Li, Q.; Stefansson, Karin M.; Roy, Rustum

doi:10.1557/jmr.1993.3176

Cited by 180 publications

(70 citation statements)

References 18 publications

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“…It has been reported recently that the microwave synthesis methods could provide an efficient way to control phase selectivity as well as fast crystallization. 11 Komarneni et al 12,13 reported the microwave-hydrothermal synthesis of BiFeO 3 at 194°C for 2 h, but the product was highly crystalline agglomerated particles. Until now there is no other report of microwave synthesis of BiFeO 3 perovskite nanomaterials.…”

Section: Eco-friendly Catalysis and Energy Laboratory (Nrl) Departmementioning

confidence: 99%

Microwave synthesis of single-crystalline perovskite BiFeO3 nanocubes for photoelectrode and photocatalytic applications

Joshi¹,

Jang²,

Borse³

et al. 2008

Applied Physics Letters

237

135

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A simple microwave synthesis procedure has been developed for the single-crystalline perovskite nanocubes composed of bismuth ferrite (BiFeO3). Typical nanocubes had sizes ranging from 50to200nm. The single-crystalline nature of nanocubes was confirmed by high resolution transmission electron microscopy and selected area electron diffraction pattern. X-ray diffraction pattern showed the rhombohedral phase with R3c space group. The material showed photoinduced water oxidation activity in both photoelectrochemical and photocatalytic modes. It could become a useful material for photoelectrode and photocatalytic applications.

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Section: Eco-friendly Catalysis and Energy Laboratory (Nrl) Departmementioning

confidence: 99%

Microwave synthesis of single-crystalline perovskite BiFeO3 nanocubes for photoelectrode and photocatalytic applications

Joshi¹,

Jang²,

Borse³

et al. 2008

Applied Physics Letters

237

135

View full text Add to dashboard Cite

show abstract

“…The first studies about microwave-assisted hydrothermal crystallization were conducted by Komarneni et al [44] [45]. In these studies, authors observed several advantages over the conventional technique such as a significant reduction of reaction times and, in some cases, the formation of different crystalline phases than those obtained by the conventional hydrothermal route.…”

Section: Microwave-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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“…Preliminary evidences of the microwave athermal effects appeared from some experiments on microwave-hydrothermal synthesis of ceramic powders 34,[49][50][51] , in which microwave-induced kinetic acceleration was demonstrated in comparison to conventional synthesis with nearly identical hydrothermal (temperature and pressure) conditions. These studies, however, should be refined since they did not give quantitative evaluations on the microwave effects.…”

Section: Identification and Evaluation Of Microwave Athermal Effectmentioning

confidence: 99%

Microwave-assisted wet chemical synthesis: advantages, significance, and steps to industrialization

Shi¹,

Hwang²

2003

JMMCE

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Previous research has revealed several advantages from microwave-assisted wet chemical synthesis in reaction acceleration, yield improvement, enhanced physicochemical properties and the evolvement of new material phases. The study present examples that demonstrate the significance of these advantages to industrial application. In order to achieve successful industrial application there is a need to distinguish between the microwave athermal (not excited by heat) effect from the microwave-induced thermal effect (temperature rise). The optimization of this new process has to be systematically investigated, so the advantages and benefits of this new technology can be fully exploited. Advantages and significance ?-Fe 2 O 3 based magnetic materials?-Fe 2 O 3 based magnetic materials have been extensively used as recording materials because of their good magnetic properties. The emergence of nanomagnetic technology has imposed new demands upon magnetic materials. To fabricate ultrahigh density and ultrahigh speed data storage devices, which work on the magnetic -spintronic concept, magnetic materials with nanoscale particles are highly preferred 1 . Conventionally, ? -Fe 2 O 3 powders with monodispersed particles are synthesized first by means of forced hydrolysis of ferric nitrate or ferric chloride in aqueous solutions, which produces α-Fe 2 O 3 , and then the α-Fe 2 O 3 are transformed into ?-Fe 2 O 3 in a high-temperature process 2,3 . To effectively control the particle shape and particle size, which are essential for achieving the desired magnetic properties, the hydrolysis solution must be very dilute. For producing micron-and submicron-sized particles, the concentrations of the ferric irons are generally within a range around 0.02M 2, 4, 5 and for producing nanosized powders, the ferric concentration should be much lower. In addition to dilute solutions, the conventional hydrolysis has to be carefully controlled and it generally requires 2-7 days. This means that, even based upon the shortest processing time and highest concentration, the rate for producing the nanosized iron oxide powders would be less than 0.014 gram per liter per hour. In order to use nanosized magnetic materials for industrial applications, appreciable acceleration of the process and an increase in the ferric concentration are required.Several researchers have attempted the iron oxide synthesis via microwave-assisted hydrolysis. Komarneni et al demonstrated that under otherwise identical processing conditions, synthesis of crystalline hematite by a microwave-hydrothermal approach was 36 times faster than by conventional hydrothermal methods 6 . Our study shows the capability of controlling the particle shape and particle size with this rapid synthesis approach. Rigneau et al further shortened the processing time to 30 minutes and also increased the ferric concentration to 0.05M 7 , which could increase the production rate over one hundred times. The even more striking finding from their results was that the microwave synthesized Fe 2 O 3 p...

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Microwave-hydrothermal processing for synthesis of electroceramic powders

Cited by 180 publications

References 18 publications

Microwave synthesis of single-crystalline perovskite BiFeO3 nanocubes for photoelectrode and photocatalytic applications

Microwave synthesis of single-crystalline perovskite BiFeO3 nanocubes for photoelectrode and photocatalytic applications

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Microwave-assisted wet chemical synthesis: advantages, significance, and steps to industrialization

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