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Beilstein J. Nanotechnol. 2023, 14, 467–477, doi:10.3762/bjnano.14.37
Figure 1: XRD diffractograms of (a) alumina showing the θ-Al2O3 phase, (b) sample 1 showing a mixture of alum...
Figure 2: Raman spectroscopy of (a) sample 1, which presents the four vibrational modes E1g characteristic of...
Figure 3: Scanning electron microscopy images of (a) sample 1 (low magnification, SE detector), (b) sample 1 ...
Figure 4: XPS core level spectra. (a) Al 2p of alumina, (b) Al 2p of sample 1, (c) Cr 2p of sample 1, (d) Al ...
Figure 5: UV–vis absorption spectra of (a) sample 1 and (b) sample 2, both confirming the oxidation state 3+ ...
Figure 6: Distribution of samples according to the hue value (h*): alumina (87.20), sample 1 (80.65), and sam...
Figure 7: Reflectance spectra in the visible region. Black line: alumina, green line: sample 1, and red line:...
Figure 8: Color stability. Total color difference (ΔE) as a function of the exposure time to different enviro...
Figure 9: Scheme of the synthetic route used to obtain mixed oxides.