fig3

Figure 3. (A) The XRD patterns of LMNO and LMNO-A. The Rietveld refinement plots of (B) LMNO and (C) LMNO-A. The XPS spectra of (D) Al 2p and (E) O 1s. (F) The EPR spectrum of LMNO and LMNO-A. The XPS spectra of (G) Ni 2p and (H) Mn 2p. (I) The specific relative content of Mn⁴⁺, Ni²⁺ and lattice oxygen.