Coarsening Kinetics of Al&lt;SUB&gt;3&lt;/SUB&gt;Sc Precipitates in an Al&amp;ndash;Mg&amp;ndash;Sc Alloy Aged at 573 K

Watanabe, Daizen; Watanabe, Chihiro; Monzen, Ryoichi

doi:10.2320/matertrans.mrp2007048

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…For instance, graphene possesses anomalous quantum Hall effect and high carrier mobility at room temperature 1-3 that offer novel applications in nanodevices. While a single-layer h-BN is an insulator with a wide bandgap energy of $5.9 eV, 4-6 which is very promising for applications in optoelectronic devices 4 and field-effect transistors. 7,8 Recently, research efforts have been devoted to explore the possibility of creating Graphene/h-BN (G/h-BN) heterostructures for broader applications such as atomically thin integrated circuitry.…”

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confidence: 99%

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Wang

Zhang

Peng

et al. 2015

Funct. Mater. Lett.

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Graphene/hexagonal boron nitride (G/h-BN) heterostructure has attracted tremendous research efforts owing to its great potential for applications in nanoscale electronic devices. In such hybrid materials, tilt grain boundaries (GBs) between graphene and h-BN grains may have unique physical properties, which have not been well understood. Here we have conducted non-equilibrium molecular dynamics simulations to study the energetic and thermal properties of tilt GBs in G/h-BN heterostructures. The effect of misorientation angles of tilt GBs on both GB energy and interfacial thermal conductance are investigated.

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confidence: 99%

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Wang

Zhang

Peng

et al. 2015

Funct. Mater. Lett.

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“…In a previous study [9], we have examined the coarsening behaviour of Al 3 Sc precipitates in the same Al-Mg-Sc alloy aged at a temperature of 573K by TEM and electrical resistivity. On ageing at 573 K, the average radius of precipitates was only 7 nm even in the case that the longest ageing time (5000 h) was applied, and the precipitates were perfectly coherent with the Al matrix and had a sphere shape.…”

Section: Calculation Of γ From Experimental Datamentioning

confidence: 99%

Coarsening of cuboidal Al₃Sc precipitates in an Al–Mg–Sc alloy

Watanabe

Tanii

et al. 2010

Philosophical Magazine Letters

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The coarsening of {001}-faceted cuboidal Al 3 Sc precipitates in an Al-Mg-Sc alloy during ageing at 698, 723 and 748 K have been examined by transmission electron microscopy and electrical resistivity. Application of the theory of Kuehmann and Voorhees for coarsening of second-phase precipitates in ternary systems, generalized to any centro-symmetric precipitates, has enabled independent derivation of the {001} interface energy without assuming values of the diffusivity of solute atoms (Sc and Mg) in the Al matrix. The {001} interface energy is estimated as 0.19 J/m 2 , which is excellent agreement with the value of 0.192 J/m2 obtained using the first-principles calculation method. The sphere-to-cuboidal shape change of the Al 3 Sc precipitate during ageing is discussed by means of a simple energy consideration.

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“…Four bands at 550 cm À1 , 650 cm À1 , 1197 cm À1 and 1453 cm À1 can be observed for all the samples which are ascribed to the vibration of B-O bonds. 18,19 The strong absorption characteristic of BN (B-N-B vibration) can be found on 803 cm À1 , which can be attributed to the in-plane vibration modes of the sp2 boned BN. 20 are observed in all the samples.…”

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Fluorescence properties of full-color-emitting BCNO phosphors synthesized under different oxygen pressure

Feng

Zhang

et al. 2014

Funct. Mater. Lett.

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The colorful BCNO phosphors comprised of boron, carbon, nitrogen, and oxygen atoms have been novelty synthesized by varying the environmental oxygen pressure without changing the compositions of the raw materials such as boric, urea, and poly-ethylene glycol. X-ray diffraction (XRD), fourier-transformed infrared (FTIR), and photoluminescence (PL) spectra were employed to characterize the effect of environmental oxygen pressure on the structure and PL properties of the synthesized phosphors. The results of their PL properties indicates that the emission color of these BCNO phosphors has been easily tailored for a large-range from violet to near-red regions through variations of the environmental oxygen pressure as prepared under the excitation of 365 nm. This provides a new approach to tailor the emitting colors.Since phosphors materials are indispensable for our cultural life, excellent phosphors have been vigorously developed so far. Usually, common phosphor materials are composed by host materials and doped rare earth ions. However, the used luminescent centers in these phosphors are rare-earth elements that are typically expensive. Thus, the development of inexpensive phosphor materials is exciting from the viewpoint of not only cost of fabrication, but also of rare earth resource conservation. Up to now, much attention has been paid to this issue, for instance, developing phosphors consisting of transition-metal ions 1,2 and defect-related luminescence materials. 3 Chemically stable and highly emissive phosphor materials are always demanded for various applications such as display and lighting. Thus, oxynitride and nitride compounds as host lattices for phosphors arouse a fast-growing interest due to their excellent properties, such as non-toxicity, outstanding thermal and chemical stability, broad available range of excitation and emission wavelengths, and high luminescence efficiency upon activation using rare-earth ions. 4 However, the production of these materials generally requires high temperatures and pressures which increases the cost of production.Based on these reasons, the development of the materials with low fabrication cost is desirable for phosphors. Recently, an oxynitride phosphor BCNO without rare earth ions is developed by a one-step liquid process at low temperature (below 900 ○ C). 5 Due to the easy production and inexpensive raw materials in the synthetic process, it is a potential phosphor for applications in the fields of lighting, and optoelectronic nanodevices etc. Subsequently, much attention has been drawn to BCNO and many interesting results have been obtained. One of the important things is to obtain multicolors in the BCNO composition due to the prominent advantage of low cost. Usually, there are many ways to control the emitting color of a certain phosphor, for instance, valence state-controlled means, 6 energy transfer among activators, 7 and changing the crystal field or the bond covalence of Eu 2þ , Ce 3þ , Mn 2þ doped phosphors. 8 Different from the situation mentioned abov...

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Coarsening Kinetics of Al<SUB>3</SUB>Sc Precipitates in an Al–Mg–Sc Alloy Aged at 573 K

Cited by 6 publications

References 12 publications

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Coarsening of cuboidal Al₃Sc precipitates in an Al–Mg–Sc alloy

Fluorescence properties of full-color-emitting BCNO phosphors synthesized under different oxygen pressure

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Coarsening Kinetics of Al<SUB>3</SUB>Sc Precipitates in an Al&ndash;Mg&ndash;Sc Alloy Aged at 573 K

Cited by 6 publications

References 12 publications

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

Coarsening of cuboidal Al3Sc precipitates in an Al–Mg–Sc alloy

Fluorescence properties of full-color-emitting BCNO phosphors synthesized under different oxygen pressure

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Coarsening Kinetics of Al<SUB>3</SUB>Sc Precipitates in an Al–Mg–Sc Alloy Aged at 573 K

Coarsening of cuboidal Al₃Sc precipitates in an Al–Mg–Sc alloy