Mechanochemical activation of aluminum: 5. Formation of aluminum carbide upon heating of activated mixtures

Стрелецкий, А. Н.; Mudretsova, S. N.; Povstugar, Ivan; Butyagin, P. Yu.

doi:10.1134/s1061933x06050152

Cited by 9 publications

(24 citation statements)

References 3 publications

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“…7−9 Due to 27 Al being a quadrupolar nucleus (I = 5/2), 27 Al NMR spectra often have broad line shapes, resulting in overlapping resonances, especially in onedimensional spectra. These overlapping resonances can make it particularly difficult to accurately deconvolute 27 Al NMR spectra and extract important NMR parameters, such as the quadrupolar coupling constant (C Q ), the quadrupolar asymmetry parameter (η Q ), and the isotropic chemical shift (δ iso ). Utilizing high spinning frequencies, we can average out certain dipolar, CSA, and first-order quadrupolar interactions.…”

Section: Resultsmentioning

confidence: 99%

“…Identifying such species is significant because 27 Al quadrupolar tensors can only be determined with accuracy when those impurities can be accounted for in the spectra. Using the two-dimensional 3Q-MAS NMR pulse sequence, the two 27 Al sites pertaining to the crystal structure were both identified and computed through CASTEP-NMR DFT calculations. On the basis of this study, we have revised the reference values of C Q , η Q , and δ iso for the two 27 Al sites.…”

Section: Discussionmentioning

confidence: 99%

“…To retrieve the full line shapes (equivalent to a rotor-synchronized t 1 increment), the MQ-MAS spectra were postprocessed (with a Matlab script) by selectively summing the isotropic and spinning side band line shapes of the carbide and oxycarbide environments. 27 Al spectra were referenced to a 1.0 M Al(NO 3 ) 3 solution at 0.0 ppm.…”

Section: Methodsmentioning

confidence: 99%

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NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors

et al. 2020

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The structure of aluminum carbide (from two different manufacturers) has been interrogated by 27 Al solid-state NMR in an effort to accurately characterize the material. Quadrupolar line shapes for 27 Al sites such as these are important to catalogue, as efforts are underway to employ NMR crystallography tools to understand and predict both solid-state structures and perturbations to these that are relevant to NMR analyses. Impurities present in both of the samples are revealed to be aluminum oxycarbides, as well as an aluminum metal impurity in one and aluminum nitride in anotherpotentially important information for groups employing aluminum carbide in syntheses or in other applications. Triple-quantum magic-angle spinning (3Q-MAS) 27 Al NMR was employed to help determine the quadrupolar parameters of the two crystallographically inequivalent aluminum sites in Al 4 C 3 . Revised values for the quadrupolar tensors of this material were measured and simulated through use of CASTEP-NMR.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors

et al. 2020

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“…28 illustrates the role of mechanochemical activation and formation of nanocomposite on the synthesis of Al 4 C 3 . 488 Thermo-synthesis was completed in a cell of a thermoanalyzer. The progress of the synthesis was controlled by exothermal heat effect and via XRD patterns.…”

Section: Metal-ceramic Nanocompositesmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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“…In the previous research [7,8] mechanochemical synthesis of Al-C nanocomposites was studied in detail, and formation of composites with high reactivity was established. However, graphite is unsuitable for some applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical synthesis of activated Me–BN (MeAl, Mg, Ti) nanocomposites

Povstugar¹,

Стрелецкий

Permenov

et al. 2009

Journal of Alloys and Compounds

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Mechanochemical activation of aluminum: 5. Formation of aluminum carbide upon heating of activated mixtures

Cited by 9 publications

References 3 publications

NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors

NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors

Hallmarks of mechanochemistry: from nanoparticles to technology

Mechanochemical synthesis of activated Me–BN (MeAl, Mg, Ti) nanocomposites

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Mechanochemical activation of aluminum: 5. Formation of aluminum carbide upon heating of activated mixtures

Cited by 9 publications

References 3 publications

NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved 27Al NMR Tensors

NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved 27Al NMR Tensors

Hallmarks of mechanochemistry: from nanoparticles to technology

Mechanochemical synthesis of activated Me–BN (MeAl, Mg, Ti) nanocomposites

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Product

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NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors

NMR Crystallography of Aluminum Carbide: Impurities in the Reagent and Improved ²⁷Al NMR Tensors