“…All the peaks can be assigned to the n = 3 Ruddlesden−Popper phase. The relatively high residual values obtained for the samples and the intensity difference observed on some peaks can be ascribed to the presence of intergrowth phenomena, as previously observed by other authors. − 1 Observed and calculated (solid line) Rietveld refinement plot of the XRD patterns for Ca 4 Mn 3 - x V x O 10 . The difference plot is at the bottom of the figure and tick marks represent allowed reflections.…”
Section: Resultssupporting
confidence: 68%
“…All samples were refined on the basis of an orthorhombic Ca 4 Mn 3 O 10 type structure (space group Pbca ), considering a statistical distribution of Mn and V cations on the two independent crystallographic sites, based on nominal composition. The initial positional parameters were taken from previous reported data of Ca 4 Mn 3 O 10 . All the peaks can be assigned to the n = 3 Ruddlesden−Popper phase.…”
In this work, electron doping of the anisotropic phase Ca4Mn3O10 was achieved by substitution of
manganese by vanadium. No significant structural modifications were detected to the highest substitution
ratio of 10% achieved. The introduction of vanadium decreases the electrical resistivity, described as
two-dimensional variable range hopping, and induces the appearance of a ferromagnetic behavior.
Consistently negative magnetoresistance develops in the magnetic ordered state. These results are
characteristic of the presence of double exchange interactions, indicating that vanadium doping induces
mixed valence of manganese.
“…All the peaks can be assigned to the n = 3 Ruddlesden−Popper phase. The relatively high residual values obtained for the samples and the intensity difference observed on some peaks can be ascribed to the presence of intergrowth phenomena, as previously observed by other authors. − 1 Observed and calculated (solid line) Rietveld refinement plot of the XRD patterns for Ca 4 Mn 3 - x V x O 10 . The difference plot is at the bottom of the figure and tick marks represent allowed reflections.…”
Section: Resultssupporting
confidence: 68%
“…All samples were refined on the basis of an orthorhombic Ca 4 Mn 3 O 10 type structure (space group Pbca ), considering a statistical distribution of Mn and V cations on the two independent crystallographic sites, based on nominal composition. The initial positional parameters were taken from previous reported data of Ca 4 Mn 3 O 10 . All the peaks can be assigned to the n = 3 Ruddlesden−Popper phase.…”
In this work, electron doping of the anisotropic phase Ca4Mn3O10 was achieved by substitution of
manganese by vanadium. No significant structural modifications were detected to the highest substitution
ratio of 10% achieved. The introduction of vanadium decreases the electrical resistivity, described as
two-dimensional variable range hopping, and induces the appearance of a ferromagnetic behavior.
Consistently negative magnetoresistance develops in the magnetic ordered state. These results are
characteristic of the presence of double exchange interactions, indicating that vanadium doping induces
mixed valence of manganese.
“…previous studies have reported the presence of either Cr 3+ and Cr 6+ in Cr doped Ruddlesden-Popper systems. In particular, Sousa et al46 reported the presence of Cr 3+ and Cr 6+ in Cr doped Ca 4 Mn 3 O 10 , whereas Bréad et al 33 reported only Cr 3+ in the Sr 4 FeCrO 6 CO 3 Ruddlesden-Popper system. The X-ray absorption near edge structure (XANES) data for Sr 4 Fe 2.6 Cr 0.4 O 10-δ and the LaCrO 3 and SrCrO 4 standards are shown in Figure 5.…”
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