Morphology, thermal stability, electronic structure and mechanical properties of α-AlFeMnSi phases with varying Mn/Fe atomic ratios: Experimental studies and DFT calculations

Rational Regulation of Reducibility and Acid Site on Mn–Fe–BTC to Achieve High Low-Temperature Catalytic Denitration Performance

“…The model reported first by Chui et al has been successfully applied in previous work. , The TEM images (Figure S5, Figure S6a-c and Figure a-c) reveal that the catalysts showed nanospheres when the Fe content was high (1Mn-2Fe), which is because the weak growth anisotropy with lower Fe content. The catalysts showed nanorods with a diameter of about 40 nm when the Mn content gradually increased (1Mn-1Fe, 2Mn-1Fe, and 3Mn-1Fe) due to the fact that the growth anisotropy was enhanced and shown tip-preferred growth, and gradually transformed into nanorods . The catalyst after activation maintained a stable structure and showed obvious pore structure, indicating that impurities were fully removed during the calcination, so that pores and active sites were fully exposed.…”

“…Combined with SEM, it can be found that the catalyst structures remained intact after activation, and the frameworks did not collapse. It can also be found that the catalysts were mainly nanospheres when there was more Fe in the composition, which gradually grew into nanorods with the increase of the Mn contents due to the difference in anisotropy . Therefore, by adjusting the ratio of Mn and Fe, the crystallinity and thermal stability can be changed to a certain extent, and the morphology can also be changed, so as to realize the tuning of the pore structure and specific surface area.…”

“…The catalysts showed nanorods with a diameter of about 40 nm when the Mn content gradually increased (1Mn-1Fe, 2Mn-1Fe, and 3Mn-1Fe) due to the fact that the growth anisotropy was enhanced and shown tippreferred growth, and gradually transformed into nanorods. 37 The catalyst after activation maintained a stable structure and showed obvious pore structure, indicating that impurities were fully removed during the calcination, so that pores and active sites were fully exposed. Additionally, the lattices belonging to (4 2 0) and (2 0 0) of Mn 2 O 3 and the lattices belonging to (1 1 0), (2 1 1), and (1 2 1) of Fe 2 O 3 were found (Figure 2c).…”

Exploring the Relationship between the Structural Characteristics and Mechanical Behavior of Multicomponent Fe-Containing Phases: Experimental Studies and First-Principles Calculations

“…Fe-containing phases such as β-AlFeSi, α-AlFeSi, α-AlFeMnSi and α-AlFeMnCrSi phases are common in Al-Si alloys and show their influence on the thermophysical and mechanical properties of Al-Si alloys [1][2][3][4][5][6][7][8][9]. The Fe-containing phases with different crystal structures and compositions show different thermophysical and mechanical properties.…”

“…The Fe-containing phases with different crystal structures and compositions show different thermophysical and mechanical properties. The addition of Mn resulted in the transformation of monoclinic β-Al 4.5 FeSi (A2/a) into cubic α-Al 19 Fe 4 MnSi 2 (Im-3), and the precipitation temperature of quaternary Fe-containing phase increased after Mn addition [6][7][8]10,11]. After the co-addition of Mn and Cr, the monoclinic β-Al 4.5 FeSi phase transformed into an α-AlFeMnCrSi phase, which was ascertained to be a cubic crystal structure with complicated Fe/Mn/Cr atomic occupations; the α-AlFeMnCrSi phase showed a high precipitation temperature, high modulus and high intrinsic hardness [6,[12][13][14].…”