Structure and magnetism of the Rh⁴⁺-containing perovskite oxides La_0.5Sr_0.5Mn_0.5Rh_0.5O₃and La_0.5Sr_0.5Fe_0.5Rh_0.5O₃

Abstract

Synchrotron X-ray powder diffraction data indicate that La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3 adopt distorted perovskite structures (space group Pnma) with A-site and B-site cation disorder. A combination of XPS and 57Fe Mössbauer...

Metal-doped niobate pyrochlores and double-perovskites for glycerol valorization: structural and electronic properties and DFT calculations

“…This is reasonable because the local environment of the Fe and Mn in perovskites might have the Fe 2+ -O2-Fe 3+ and Mn 3+ -O2-Mn 4+ double exchange interactions in reason for the increment in terms of the number of the d-d orbitals with oxygen. 58 These findings are consistent with the changes in the surface of the La 2 FeMnO 6 perovskite observed in the present work.…”

“…8h) illustrates two main components for the doublet Mn 2 p 1/2 –Mn 2 p 3/2 at 652.8 and 640.9 eV, which is due to the Mn 3+ ions. 58 It is important to note that the multiplet associated with the Mn oxidation state is found with additional binding energies at 643.1 and 656.3 eV, which are due to the Mn 3+ and Mn 4+ species, respectively. This is reasonable because the local environment of the Fe and Mn in perovskites might have the Fe 2+ –O2–Fe 3+ and Mn 3+ –O2–Mn 4+ double exchange interactions in reason for the increment in terms of the number of the d–d orbitals with oxygen.…”

“…This is reasonable because the local environment of the Fe and Mn in perovskites might have the Fe 2+ –O2–Fe 3+ and Mn 3+ –O2–Mn 4+ double exchange interactions in reason for the increment in terms of the number of the d–d orbitals with oxygen. 58…”

“…Two other emission lines for O 1 s appears for the ZnNb, PbNb and LaFeMn with lower intensity at 530.3–532.0 and 533.2 eV, which is likely due to the adsorbed oxygen (O ads ) and adsorbed water molecules, and carbonates. 56–58 Of importance, the ratio between lattice (O 529 ) and adsorbed oxygen (O 530 ) can be used to estimate the concentration of oxygen defects in perovskites and niobates. 60 Accordingly, the O 529 /O 530 ratios are 0.11, 0.84, 0.23 and 0.36 for CuNb, LaFeMn, ZnNb and PbNb, respectively.…”

“…The peak at 709.9 eV suggests the trivalent iron in a 3d 5 configuration, as found in the LaFe-based perovskites. [57][58][59] Noteworthily, the presence of the satellites close to the Fe 2p 3/2 at 718.0 eV indicates a charge transfer during the photoemission process, as observed for perovskites. 59 Besides, the Mn 2p core level spectrum (Fig.…”