Microwave assisted preparation of Eu2+-doped Åkermanite Ca2MgSi2O7

Birkel, Alexander; Darago, Lucy E.; Morrison, Alasdair; Lory, Laurianne; George, Nathan C.; Mikhailovsky, Alexander; Birkel, Christina S.; Seshadri, Ram

doi:10.1016/j.solidstatesciences.2012.03.014

Cited by 29 publications

(16 citation statements)

References 33 publications

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“…Besides, the heating mechanism is direct due to the possible interaction/coupling of microwaves to the precursors and Joule Heating effects caused by the electric current during spark plasma sintering. Both techniques (independently or in combination) can be used to prepare a variety of inorganic materials, such as oxides, intermetallics,, and carbides …”

Section: Introductionmentioning

confidence: 99%

Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃

Hamm

Schäfer

Zhang

et al. 2016

Zeitschrift anorg allge chemie

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V4AlC3 belongs to the intriguing class of materials of so‐called MAX phases that are ternary carbides and nitrides crystallizing in a layered crystal structure with space group P63/mmc. They exhibit excellent mechanical properties combining characteristics of metals as well as ceramics. The synthesis of single‐phase products is far from being trivial since high temperatures are required, while most competing phases are also thermodynamically stable. Herein, we show the non‐conventional solid‐state preparation by susceptor‐assisted microwave heating within 60 min. The crystallinity of the nearly single‐phase compound is enhanced by subsequent densification using the spark plasma sintering technique. The formation mechanism of V4AlC3 is investigated by means of thermoanalysis. Intermediate as well as final products are characterized by powder X‐ray diffraction techniques.

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Section: Introductionmentioning

confidence: 99%

Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃

Hamm

Schäfer

Zhang

et al. 2016

Zeitschrift anorg allge chemie

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“…This gel was then dried at 125 C overnight and finely ground. The ground powder was then heated to 400 C and held for 4 h, and finally heated to 650 C and held for 6 h. The resultant powder was reground and heat-treated in a microwave setup, as described elsewhere [26,28,29].…”

Section: Methodsmentioning

confidence: 99%

“…There is no significant shift in the position of the emission band maximums originating from both dopant ions. While the f / f transitions usually show only very little temperature dependence in regards to their position, 5d / 4f transitions very often show a strong shift with an increase in temperature [29]. Additionally, it is observed that the emission intensity is strongly temperature dependent.…”

Section: Ba 3 Mgsi 2 O 8 Co-activated With Eu 2þ and Tb 3þmentioning

confidence: 98%

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Birkel

DeCino

Cozzan

et al. 2015

Solid State Sciences

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a b s t r a c tWe present a rapid and energy-efficient microwave-assisted approach to prepare a single-phase fullcolor phosphor based on Ba 3 MgSi 2 O 8 . The samples were prepared using a citric acid based solegel preparation pathway with a microwave-assisted heating step, which reduces the time required for the final heat treatment to less than 30 min. Thermogravimetric analysis was utilized to optimize the solution-based preparation prior to microwave heating. The structural properties of the obtained luminescent materials have been thoroughly investigated by means of X-ray powder diffraction and Rietveld analyses. To study the optical behavior, the excitation and emission spectra were recorded. Fullcolor emission is achieved using Eu 2þ (blue), Tb 3þ (green), and Mn 2þ (red) as the activator ions. The thermally robust emission was investigated using temperature-dependent luminescence spectroscopy. The energy-transfer processes within the samples were studied using time-dependent spectroscopy, and the quantum yield of this true color phosphor as a function of the composition was determined.

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“…This crucible was placed within alumina foam housing and covered using a lid also constructed from alumina foam. 24 A 2.45 GHz invertertype microwave (Panasonic) with a 1200 W power supply was then used to heat the sample for 2 min at full power. Subsequently, the alumina foam housing was allowed to cool to room temperature within the microwave oven.…”

Section: Methodsmentioning

confidence: 99%

Microwave-induced nucleation of conducting graphitic domains on silicon carbide surfaces

O'Loughlin

Depner

Schultz

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Microwave irradiation of the C-rich (0001¯) surface of 6H-SiC is seen to rapidly induce the nucleation of conductive nanoscopic graphitic grains. Discrete graphitic islands are observed and Raman spectroscopy suggests turbostratic stacking with minimal electronic coupling between adjacent graphene layers. Ensemble Raman and near-edge x-ray absorption fine structure (NEXAFS) spectroscopies are used in conjunction with spatially resolved atomic force microscopy, scanning Kelvin probe microscopy (SKPM), and colocalized Raman imaging to characterize the topography and electronic structure of the obtained graphitic domains and to develop a mechanistic description of the nucleation process. SKPM provides a direct spatially resolved means to differentiate conductive graphitic grains from the wide-bandgap SiC semiconductor. NEXAFS spectroscopy allows for evaluation of the planar alignment of the graphitic nuclei. The microwave processing method demonstrated here provides a facile route to patterning conductive domains on a ceramic component for applications in power electronics and multilayered ceramic capacitors.

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Microwave assisted preparation of Eu2+-doped Åkermanite Ca2MgSi2O7

Cited by 29 publications

References 33 publications

Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃

Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Microwave-induced nucleation of conducting graphitic domains on silicon carbide surfaces

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Microwave assisted preparation of Eu2+-doped Åkermanite Ca2MgSi2O7

Cited by 29 publications

References 33 publications

Non‐conventional Synthesis of the 413 MAX Phase V4AlC3

Non‐conventional Synthesis of the 413 MAX Phase V4AlC3

A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Microwave-induced nucleation of conducting graphitic domains on silicon carbide surfaces

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Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃

Non‐conventional Synthesis of the 413 MAX Phase V₄AlC₃