Structural, magnetic, and dielectric studies of cubically ordered Sr2FeMnO6

D. Triyono, Afla Hannisa, Heidi Laysandra

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we determined the atomic composition, microstructure, crystallography, magnetisation, thermal, and dielectric properties of a double perovskite Sr2FeMnO6 system synthesised using sol–gel and sintering methods. X-ray fluorescence confirms the atomic composition of the Sr2FeMnO6 system. Scanning electron microscopy and energy-dispersive X-ray analyses reveal nonuniform grain distribution, with an average grain size of approximately 2.12 µm. X-ray diffraction analysis confirms that the Sr2FeMnO6 crystallised as a double-perovskite structure with a cubic cell belonging to Fm3m (225) symmetry. X-ray photoelectron spectroscopy (XPS) spectra of Fe 2p and Mn 2p core levels confirm the mixed chemical ionic states of Fe (Fe3+ and Fe4+) and Mn (Mn3+ and Mn4+) in the Sr2FeMnO6 system. O 1 s XPS spectra reveal oxygen existing in the form of lattice oxygen and oxygen vacancies while Sr is presented as Sr2+. The Raman phonon modes confirm phase purity and Fe/MnO6 octahedral vibration of the system. The Sr2FeMnO6 system exhibits a ferrimagnetic nature with a remnant magnetisation value of approximately 0.11 µB/f.u. Differential scanning calorimetry reveals a heat-flow peak temperature of 862.1 °C, which possibly corresponds to a magnetic transition temperature. Finally, the temperature-dependent dielectric constant confirms the existence of a ferroelectric–paraelectric transition at 528 K. Dielectric relaxation behaviour, with an activation energy of approximately 1.93 eV, is observed and is caused by the thermal motion of double ionised oxygen vacancies.

Original languageEnglish
Article number232
JournalApplied Physics A: Materials Science and Processing
Volume128
Issue number3
DOIs
Publication statusPublished - Mar 2022

Keywords

  • Cubic symmetry
  • Electrical transition
  • Ferrimagnetic
  • SrFeMnO

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