Peculiarities of 57-Fe NMR Spectrum in Micro- and Nanocrystalline Europium Orthoferrites

TL;DR

This study investigates the 57-Fe NMR spectra of europium orthoferrite with micro- and nanocrystalline particles, revealing complex spectral features and differences related to particle size, which were characterized for the first time.

Contribution

First analysis of 57-Fe NMR spectra in dispersed europium orthoferrite micro- and nanocrystals, highlighting spectral complexity and size-dependent differences.

Findings

Spectra are more complex than expected for a single Fe3+ site.

Noticeable differences between micro- and nanocrystalline samples.

Assumptions proposed for the physical nature of observed effects.

Abstract

NMR spectra of 57-Fe dispersed europium orthoferrite in powder samples with micro- and nanocrystalline particles were studied for the first time. The material was synthesized by glycine-nitrate combustion, which allowed to obtain the specimens with granular diameters of 60 nm(nano-EuFeO3) and 1.5 um (micro-EuFeO3). It was found out that the spectra are more complex than could be expected for a compound with a single crystallographic position of Fe3+ ions, and it was also identified that there is a noticeable difference in samples with different fineness. Assumptions about the possible physical nature of the observed effects are made.