Evidence through Mössbauer spectroscopy of two different states for 57Fe probe atoms in RNiO3 perovskites with intermediate-size rare earths, R = Sm, Eu, Gd, Dy
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physics: Condensed Matter. 2007, vol. 19, n° 3, p. 036201 (12 p.)
IOP Publishing
Résumé en anglais
In the present work, 57Fe probe Mössbauer spectroscopy was developed to study the nickelates RNi0.98Fe0.02O3 (R = Sm,Eu,Gd,Dy) with the perovskite-like structure. The restoration method for a distribution function P(v) of ...Lire la suite >
In the present work, 57Fe probe Mössbauer spectroscopy was developed to study the nickelates RNi0.98Fe0.02O3 (R = Sm,Eu,Gd,Dy) with the perovskite-like structure. The restoration method for a distribution function P(v) of the positions (v) involving individual Lorentzian lines has been used for processing and analysing the Mössbauer spectra. The P(v) profile for the nickelates, at T Gd). The observed asymmetry of the P(v) profile indicates that 57Fe atoms used as a Mössbauer probe are simultaneously stabilized in two non-equivalent crystallographic positions. This result is an indirect evidence for the existence of two types of nickel position in the insulating state of nickelate RNiO3 lattices with intermediate R3+ size, which remained questionable from diffraction methods.< Réduire
Mots clés en anglais
Mössbauer spectroscopy
57Fe
Nickelates
Perovskite
Crystal structure
Origine
Importé de halUnités de recherche