In situ synchrotron radiation monitoring of phase transitions during microwave heating of Al–Cu–Fe alloys

Vaucher, S.; Nicula, R.; Catalá-Civera, J.M.; Schmitt, B.; Pàtterson, B. D.

doi:10.1557/jmr.2008.0009

Cited by 34 publications

(16 citation statements)

References 34 publications

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“…Recently, externally applied fields such as direct electric fields and electromagnetic (EM) fields have been used to reduce the time and temperature requirements for material processing . In addition to saving time and energy, applied fields can also affect material properties by inducing phase transformations or altering microstructure and morphologies of nanoparticles . One such externally applied field is microwave radiation (MWR), which comprise EM waves within the frequency range of 0.3–300 GHz.…”

Section: Introductionmentioning

confidence: 99%

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

et al. 2019

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Electromagnetic (EM) fields can trigger a range of surprising responses in materials. Microwave radiation (MWR), a type of EM field in the frequency range of 0.3–300 GHz, can lower the synthesis temperature required for ceramics such as TiO2 and induces mixed amorphous–crystalline phase compositions. To better understand the effects of MWR on matter, structural changes during microwave heating and MWR‐assisted synthesis using in situ synchrotron X‐ray diffraction are studied. Anisotropic expansion–contraction of lattice parameters under microwave‐radiation is observed, which contradicts the results from conventional thermal heating. When as‐received TiO2 powders are heated with MWR, an instantaneous decrease in the intensities of diffraction peaks indicates decrystallization/amorphization. High‐resolution electron microscopy supports these observations. Raman spectroscopy and X‐ray photoemission spectroscopy indicate increased defect‐generation under microwave exposure. Molecular dynamics simulations on the anatase phase of TiO2 suggests that introducing an oxygen vacancy can lead to the formation of an interstitial–vacancy pair resulting in anisotropic expansion–contraction of the lattice. These unique responses of ceramics under externally applied fields provide direct evidence for nonthermal coupling between EM fields and matter. Understanding such nonthermal, field‐driven processes has implications in engineering low‐temperature processes for integrating ceramics with polymers for flexible electronics, energy harnessing, and storage applications.

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Section: Introductionmentioning

confidence: 99%

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

et al. 2019

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“…We have used a proprietary monomode microwave applicator operating at 2.4 GHz. More details on the experimental setup can be found in our previous papers on in situ microwave heating [8,9].…”

Section: Methodsmentioning

confidence: 99%

Nanocrystallization of amorphous alloys using microwaves:In situtime-resolved synchrotron radiation studies

Nicula

Stir

Ishizaki

et al. 2009

J. Phys.: Conf. Ser.

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Important energy and time savings can be achieved with the thermal treatment of materials by replacing conventional heating methods with microwave heating. The nanocrystallization of Co-Fe-W-B amorphous alloy powders under microwave irradiation was followed for the first time by in situ time-resolved synchrotron radiation powder diffraction. It is shown that even a very short exposure to the electromagnetic field (single pulse microwave application) typically of the order of a few seconds is sufficient to obtain the bulk nanocrystalline state. A metastable high-temperature Co-W-B orthorhombic phase forms during the microwave heating, which gradually transforms to the tetragonal Co 2 B stable phase.

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“…In another report, Nicula et al utilized a single-mode microwave applicator with a rectangular cavity to study E (electric) and H (magnetic) field-assisted heating separately, including phase transitions during the reduction of magnetite (Fe 3 O 4 ) to iron, 40,41 intermetallic synthesis, 42,43 and crystallization of amorphous materials. [44][45][46] We will focus our discussion here on the reduction of the ceramic oxide system of Fe 3 O 4 .…”

Section: In Situ Synchrotron X-ray Studies Of Mwr-assisted Synthesismentioning

confidence: 99%

Synchrotron X-ray characterization of materials synthesized under microwave irradiation

Nakamura

Reeja‐Jayan

2019

J. Mater. Res.

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In situ synchrotron radiation monitoring of phase transitions during microwave heating of Al–Cu–Fe alloys

Cited by 34 publications

References 34 publications

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

Defect‐Mediated Anisotropic Lattice Expansion in Ceramics as Evidence for Nonthermal Coupling between Electromagnetic Fields and Matter

Nanocrystallization of amorphous alloys using microwaves:In situtime-resolved synchrotron radiation studies

Synchrotron X-ray characterization of materials synthesized under microwave irradiation

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