The Structure and EPR Of The Lowsize Powders KNb1-XFeXO3

Iryna Golovina V.E. Lashkaryov Institute of semiconductor physics NAS of Ukraine https://orcid.org/0000-0002-5258-3039
V. Rodionov V.E. Lashkaryov Institute of semiconductor physics NAS of Ukraine
S. Khaynakov University of Oviedo, Spain
Volodymyr Lytvynenko Institute of electrophysics and radiation technologies NAS of Ukraine https://orcid.org/0000-0003-4850-2555

Keywords: potassium niobate, nanopowders, phase composition, electron paramagnetic resonance

Abstract

The compounds of KNb_1-xFe_xO₃ system (at 0.01 < х < 0.8), synthesized by a technique of oxidation of metal in molten potassium nitrate with the addition of potassium hydroxide, have been investigated by means of XRD, SEM and EPR methods. Homogeneity range and solubility limit of iron have been established. The XRD data showed that in the compositions with x>0.2, in addition to the solid solution, an impurity phase a-Fe₂O₃ is emerged. In the EPR spectra even at х=0.05, a ferromagnetic resonance signal at g=2.004 is registered, which presumably also corresponds to a-Fe₂O₃ phase. In the compositions with x=0.1 and above, another ferromagnetic signal at g »15 arises, which may corresponds to the formation of a-Fe clusters.

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References

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