Dynamics of microwave-induced currents in ionic crystals

Rybakov, K. I.; Semenov, V. E.; Freeman, S. A.; Booske, John H.; Cooper, R. F.

doi:10.1103/physrevb.55.3559

Cited by 53 publications

(28 citation statements)

References 4 publications

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“…It indicates that the microwave heating enables to reduce the synthesis temperature, avoiding the sintering-like glomeration phenomenon that is usually observed in GPS samples. The much lower synthesis temperature applied in the microwave heating method may be due to the fact that the microwave-irradiated processing gives rise to an additional driving force (named ponderomotive force) for mass transport beside driving forces provided by the matter concentration gradient and temperature gradient, which has been identified by Booske et al [15], Freeman et al [16] and Rybakov et al [17] through experimental evidence and numerical simulation in the study of ionic system under microwave radiation. They claimed that the ponderomotive force could pump defects to the crystal boundary and promote mass transport in a long-distance into the crystal interior through enhanced diffusion kinetics.…”

Section: Methodsmentioning

confidence: 99%

Facile synthesis of Ca-α-SiAlON:Eu2+ phosphor by the microwave sintering method and its photoluminescence properties

2012

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Pure Ca--SiAlON:Eu 2+ was synthesized by microwave sintering method at a relatively low temperature of 1550°C. Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by conventional gas-pressure sintering technique at 1750°C. When it was excited at 450 nm, the as-prepared yellow Ca--SiAlON:Eu 2+ sample had an external quantum efficiency of 42%, comparable to the sample synthesized at 1750°C under 0.5 MPa N 2 gas pressure by the GPS method reported in reference. The experimental results demonstrated that the microwave sintering method was also an interesting approach for synthesizing nitride phosphors, which promises lower firing temperature than those by carbothermal reduction and nitridation (CRN) methods, higher heating rate and shorter duration time compared with those by gas-pressure sintering.

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Section: Methodsmentioning

confidence: 99%

Facile synthesis of Ca-α-SiAlON:Eu2+ phosphor by the microwave sintering method and its photoluminescence properties

2012

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“…19,20 Therefore, the ionic transport in materials could provide a significant microwave absorption property, as previous papers suggested the Joule heating associated with ion migration is also one of component in MW heating. 21,22 Consequently, the desired object of heating of imperfect CH 3 NH 3 PbI 3 before the crystallization could be selectively heated under microwave, and thus the effect of selective heating would provide the high quality of perovskite crystals as a result of extended Ostwald ripening process duration.…”

Section: Resultsmentioning

confidence: 99%

Microwave Application to Efficient Annealing Process of CH3NH3PbI3 Perovskite Crystalline Films

et al. 2017

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As next-generation printable solar cells, perovskite solar cell utilizing organometal halide perovskite crystalline semiconductor as the active layer has been considered as one of the most promising systems for its high efficiency (>~22%) and construction with low-cost materials. Annealing process of organometal halide perovskite crystalline films are, however, relatively time-consuming process for the perovskite solar cells. We propose the microwave heating applied to the annealing process of the CH 3 NH 3 PbI 3 perovskite crystalline films for converting the intermediate state of as-coated precursor films into perovskite poly-crystalline films. Observed rapid conversion process into perovskite crystals with higher crystallinity and even the degradation of perovskite to be PbI 2 by evaporation of methylammonium iodide at relatively lower temperature to the conventional hotplate heating imply a promising potential to achieve novel high throughput annealing process with high-quality crystallinity of perovskite films at low-temperature due to direct and effective heating of CH 3 NH 3 PbI 3 films by the microwave irradiation.

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“…The principal achievement of the collaborative study was to demonstrate agreement between the theory and the experimental data regarding sophisticated details of transient features in the time-dependent ionic current induced by the microwave pulses. 16 …”

Section: ͑8͒mentioning

confidence: 99%

“…14 Careful comparisons with a recent theoretical model 15 have confirmed that this phenomenon is the result of microwave ponderomotive forces. 16 Numerical analyses 17 have established that these ponderomotive forces can, indeed, be strong enough to compete with conventional driving forces in various examples of heat processing of ceramics and glasses.…”

Section: Introductionmentioning

confidence: 99%

Microwave ponderomotive forces in solid-state ionic plasmas

et al. 1998

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Numerous observations have been reported in the literature of enhanced mass transport and solid-state reaction rates during microwave heating of a variety of ceramic, glass, and polymer materials. An explanation for these controversial observations has eluded researchers for over a decade. This paper describes a series of recent experimental and theoretical investigations that provide an explanation for these intriguing observations in terms of ponderomotive forces acting on mobile ionic species. The ponderomotive phenomenon, like its conventional-plasma analog, can be described in the continuum model limit by combining the continuity, Poisson's, and transport equations. However, the solid-state plasma version typically manifests as a result of gradients in mobile charge mobility ͑e.g., near physical surfaces or interfaces͒, whereas the conventional plasma ponderomotive transport is typically a consequence of gradients in the radiation field intensity. Both cases can be captured in a single, general, mathematical articulation developed in terms of the mobile particle fluxes.

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Dynamics of microwave-induced currents in ionic crystals

Cited by 53 publications

References 4 publications

Facile synthesis of Ca-α-SiAlON:Eu2+ phosphor by the microwave sintering method and its photoluminescence properties

Facile synthesis of Ca-α-SiAlON:Eu2+ phosphor by the microwave sintering method and its photoluminescence properties

Microwave Application to Efficient Annealing Process of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite Crystalline Films

Microwave ponderomotive forces in solid-state ionic plasmas

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