Issue 35, 2024

CoNiCuCrS alloy nanoparticles: synthesis and atomically resolved T/STEM studies

Abstract

In this paper, we reported the synthesis and characterization of CoNiCuCrS nanoparticle alloys using scanning transmission electron microscopy (STEM) techniques. The nanoparticles form hexagonal platelets with an average size of 34.5 nm. Atomic resolution STEM imaging reveals an ordered FCC crystal structure with a lattice parameter of 0.93 nm, consistent with a (CuCo)6Ni3Cr1S13.333 intermetallic phase. The paper provided direct experimental evidence of the strain distribution at the atomic scale using advanced STEM techniques. The findings are consistent with previous studies, confirming the presence of small but significant strains in high entropy alloys (HEAs). By studying nanoparticles, we achieved atomic-resolution imaging and characterization, which is challenging with bulk HEA samples. The work revealed that defects like stacking faults and partial dislocations, stabilized by the presence of sulphur in our sample, play an important role in the mechanical properties of HEAs. This research demonstrated that nanoparticles can be used as a model for studying bulk properties of HEAs, providing insights into local strain effects and crystal growth dynamics.

Graphical abstract: CoNiCuCrS alloy nanoparticles: synthesis and atomically resolved T/STEM studies

Article information

Article type
Paper
Submitted
16 May 2024
Accepted
08 Aug 2024
First published
22 Aug 2024

Phys. Chem. Chem. Phys., 2024,26, 22894-22899

CoNiCuCrS alloy nanoparticles: synthesis and atomically resolved T/STEM studies

C. E. Rufino da Silva, D. Bahena Uribe, J. J. Velázquez Salazar, D. Karna, J. Agyei-Mensah and M. J. Yacamán, Phys. Chem. Chem. Phys., 2024, 26, 22894 DOI: 10.1039/D4CP02042A

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