The location of Mn2+ ions in ZnO:Mn nanocrystals synthesized by ultrasonic aerosol pyrolysis

Authors

  • O. V. Kovalenko Oles Honchar Dnipro National University, Dnipro, Ukraine
  • V. Yu. Vorovsky Oles Honchar Dnipro National University, Dnipro, Ukraine
  • V. V. Slavnyi Oles Honchar Dnipro National University, Dnipro, Ukraine

DOI:

https://doi.org/10.15421/332516

Keywords:

method of ultrasonic aerosol pyrolysis, oxygen vacancies, X-ray diffraction analysis, Mn2+ ions, ferromagnetic properties, heat treatment

Abstract

The paper presents the results of EPR studies of ZnO:Mn nanocrystals with an impurity concentration of 2 at.% obtained by ultrasonic pyrolysis of aerosol. It is shown that under non-equilibrium conditions of synthesis by this method, Mn2+ impurity ions are unevenly distributed in the volume of the nanocrystal, and the nanocrystal itself has a defective surface layer. Mn2+ ions located in this surface layer, together with oxygen vacancies, determine the ferromagnetic properties of the sample. Significant thermal stability of the defective surface layer is established during heat treatment of the sample at T=550°C for 1 hour. The possibility of restoring the ferromagnetic properties of ZnO:Mn nanocrystals by heat treatment in hydrogen is established. Such treatment restores the concentration of oxygen vacancies in the surface layer, which are lost during the previous heat treatment in air.

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Published

26-12-2025

Issue

Vol. 33 No. 2 (2025)

Section

Articles