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. 2020 Oct 22;10:18062. doi: 10.1038/s41598-020-74816-0

Figure 3.

Figure 3

EPR spectra of the (a) PVP and (b) SHMTP ZnO:Mn samples, normalized by mass and spectrometer parameters; (c) Actual concentration of the Mn2+ ions in the ZnO:Mn samples with different nominal doping levels.