The Raman spectra of the surfaces of N

The Raman spectra of the surfaces of N50 subjected to the various experimental conditions contain three primary features in Fig. 2. The shoulders on the higher wavenumber side of the spectra A 205804 characteristic of Fe3O4 ∼670 cm−1 and FeCr2O4 spinel structures ∼685 cm−1. The features observed at ∼625 cm−1 and 610 cm−1 in Fig.