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Jahn–Teller distorted Cu1−xNixCr2O4 (x = 0, 0.5, 1) nanoparticles

Authors :
Pankaj Kumar Mohanty
Bryan P. Doyle
A. R. E. Prinsloo
Farai Rubengo
Emanuela Carleschi
C. J. Sheppard
Source :
Surface Science Spectra. 27:024015
Publication Year :
2020
Publisher :
American Vacuum Society, 2020.

Abstract

In this report, x-ray photoelectron spectroscopy data for three types of Cu-doped nickel chromite nanoparticles are presented. CuCr2O4, Cu0.5Ni0.5Cr2O4, and NiCr2O4 were prepared using the citric acid-assisted sol-gel method. All samples were amorphous after the initial gel preparations were dried, but after calcination at temperatures higher than 700 °C, the samples crystallized in a spinel structure. X-ray diffraction patterns for the samples were well fitted with the I41/amd space group. Survey scans were conducted as well as detailed scans of Cu 2p, Ni 2p, Cr 2p, and O 1s levels. The O 1s core level was well-fitted with three components, including lattice oxygen (low binding energy) and two higher binding energy components, which corresponded to surface-absorbed hydroxyl groups originating from water and alcohol used in the synthesis of the particles. The line shape of the Cu 2p core level was compatible with mixed 2+ and 1+/0+ oxidation states for Cu ions in these nanoparticles. The strong intensity of the high binding energy satellite indicated that the majority of the Cu 2p ions were in 2+ oxidation state. Finally, Ni 2p showed a mixed 3+/2+ oxidation state for Ni ions in these nanoparticles.

Details

ISSN :
15208575 and 10555269
Volume :
27
Database :
OpenAIRE
Journal :
Surface Science Spectra
Accession number :
edsair.doi...........8740b0546ec0dbfa280dfeb61fad8a42
Full Text :
https://doi.org/10.1116/6.0000444