X-ray photoemission spectroscopy investigation of Ce_{1 −x}Eu_xCrO₃nano-powders

Abstract

To reveal the surface elemental composition and chemical states of the Ce1 − xEuxCrO3 nano‐powders (x= 0.0, 0.3, 0.5, 0.7, 0.8, 1.0), X‐ray photoelectron spectroscopy was carried out in two conditions of before and after surface cleaning. This surface characterization described the core level binding energies of cerium, europium and chromium with different oxidation states. These results verified the morphology of the particles' surface which can be a confirmation of the spin disorder in these core‐shell structures. The effect of surface Ar sputtering on the oxidation states were studied. Copyright © 2016 John Wiley & Sons, Ltd.

Effect of Ce substitution on the local magnetic ordering and phonon instabilities in antiferromagnetic DyCrO3 perovskites

“…On the other hand, the deconvolution of Ce-3d core-level spectra requires four independent peaks located at 881.4, 884.5, 899.4, and 901.5 eV corresponding to the doublets at 3d 5/2 and 3d 3/2 in-line with the previous studies cited in the reference [48]. The core level of Ce with xenon like configuration with filled s orbital and d orbital validating the trivalent oxidation state [48]. While the transition metal Cr-2p core-level spectra consists of four peaks located at 575.2, 576.3, 584.3, and 586.3 eV in which the peaks centred at 587 eV and 584.2 eV are originating from the doublet of 2p 1/2 electronic state.…”

“…These two peaks are separated by the difference in the binding-energy, Δ ∼ 2 eV are commonly characterized as the spin-orbit coupling strength and its magnitude confirms the trivalent oxidation state of Dy in each composition. On the other hand, the deconvolution of Ce-3d core-level spectra requires four independent peaks located at 881.4, 884.5, 899.4, and 901.5 eV corresponding to the doublets at 3d 5/2 and 3d 3/2 in-line with the previous studies cited in the reference [48]. The core level of Ce with xenon like configuration with filled s orbital and d orbital validating the trivalent oxidation state [48].…”

Impact of Rare-earth site Substitution on the Structural, Magnetic and Thermal Properties of Ce$_{1-x}$Eu$_x$CrO$_3$ Orthochromite Solid-solutions

“…Chemical and structural properties and the morphology of the boundary phases CeCrO 3 and EuCrO 3 as well as a surface analysis of the Ce 1−x Eu x CrO 3 nano-powders have been described in detail elsewhere. 16,20,23,28 The results of our NPD on CeCrO 3 and the XRPD experiments on Ce 1−x Eu x CrO 3 together with the Rietveld refinements are shown in Figures 3 and 4(a -c). The comparison of the refined structural parameters compiled in Table I reveals good agreement between parameters refined from our XRPD and NPD patterns and previously reported data.…”