Chemical interaction and electronic structure in a compositionally complex alloy: A case study by means of X-ray absorption and X-ray photoelectron spectroscopy

How Atomic Bonding Plays the Hardness Behavior in the Al–Co–Cr–Cu–Fe–Ni High Entropy Family

“…Finally, the Cr– M and the Ni– M ones have the most dispersed bond length distributions, implying that their role changes most when removing one (any) element from the mother compound CCA, possibly driven by specific interactions such as SRO. [ 28 ]…”

“…Synchrotron radiation [23][24][25] has been used for these purposes on few occasions on refractory bcc-based medium-and high-entropy alloys: correlations have been found between microhardness and pair distribution function peak widths, [23] yield strength, and Debye-Waller factors from several techniques, [24] and between a tensile tested/as-prepared specimen and atomic pair distances from extended X-ray absorption fine structure (EXAFS). [25] A Cantor-related Al-Co-Cr-Cu-Fe-Ni system, already widely investigated in literature by coauthors, [26][27][28][29][30] was chosen for extending the knowledge on the high entropy in terms of lattice distortion and electronic structure effects in fcc systems, and for correlating such knowledge with chemical short-range order (SRO) information. Individual alloying elements in a senary compositionally complex alloy Al 8 Co 17 Cr 17 Cu 8 Fe 17 Ni 33 (CCA) were removed one at a time preserving the ratio between alloying elements, so that a systematic study on the CCA and its five fccstructured quinary subsystems can be carried out, ideally, by isolating the role of each element in the solid solution.…”

“…A Cantor‐related Al – Co–Cr–Cu–Fe–Ni system, already widely investigated in literature by coauthors, [ 26–30 ] was chosen for extending the knowledge on the high entropy in terms of lattice distortion and electronic structure effects in fcc systems, and for correlating such knowledge with chemical short‐range order (SRO) information. Individual alloying elements in a senary compositionally complex alloy Al 8 Co 17 Cr 17 Cu 8 Fe 17 Ni 33 (CCA) were removed one at a time preserving the ratio between alloying elements, so that a systematic study on the CCA and its five fcc‐structured quinary subsystems can be carried out, ideally, by isolating the role of each element in the solid solution.…”

Self-Circulating Adsorption–Desorption Structure of Non-Noble High-Entropy Alloy Electrocatalyst Facilitates Efficient Water Splitting

“…At the same time, it has also been pointed out that the stacking fault energies of some HEAs with cubic crystal structure systems decrease along with a decrease in temperature . With the introduction of a high-entropy alloy (HEA), the mechanism of the synergistic catalytic action of multiprincipal metal elements has been proposed. − Taking an AlCoCrCuFeNi HEA as an example, the occupied and empty Ni 3d states shift away from the Fermi level. In contrast, the Cr 3d empty states move toward the Fermi level about the pure counterpart to improve the electron transfer ability and increase the catalytic activity.…”

Desarrollo de estrategias para mejorar la reversibilidad estructural de materiales base cobre y níquel como cátodos de baterías de ion-Li

“…La presencia de dos señales es debido al Cu 2+ en la fase ortorrómbica y el Cu 3+ en la posición de ion Ni 3+ , en la estructura de Cu-LNO. Los desplazamientos en las energías de enlace con respecto a las muestras de referencia se asocian a las interacciones químicas entre los cationes de níquel y cobre en la estructura cristalina, atribuidas a cualquier modificación en la densidad de electrones en un átomo dado, que induce un cambio en la energía de enlace para sus electrones de nivel de núcleo interno y es detectado por los espectros de XPS[68][69][70].…”