Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba)

  • Olexandr Dziazko Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
  • Sergiy Nedilko Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
  • Olexandr Zaslavsky Ukrainian State Scientific Research Institute "Resurs", Kyiv, Ukraine
  • Vadym Kulichenko Kyiv National University of Construction and Architecture, Kyiv, Ukraine
  • Igor Fesych Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
  • Anastasiia Bolotnikova Bogomolets National Medical University of Kyiv, Kyiv, Ukraine
  • Nataliia Sabadash Food Technologies National University of Food Technologies, Kyiv, Ukraine
Keywords: LaCoO3, mixed oxides, lanthanum cobaltates, perovskite-like structure, surface morphology, FMR, diffuse reflection spectra, cluster spin glass

Abstract

Samples of La1-3xLixM2xCoO3-δ (M = Ca, Sr, Ba; 0≤x≤0,1) were synthesized by co-precipitation method. It is shown that the region of their homogeneity lies in the range of substitutions 0≤ x ≤0.05. The volume of the unit cell increases   with the size of the alkaline earth metal that replaces lanthanum. Surface morphology of the obtained mixed oxides was studied by SEM. In all samples (except strontium - containing) paramagnetic Co2+ ions from the impurity Co3O4, which are in different local environments and have different degrees of exchange interaction with each other, are contained in the form of chain fragments -Co2+-O2--Co2+-O2--Co2+-O2—  and contain defective centers Со2+, which are formed during the desorption of lattice oxygen from the surface, or in the process of diffusion of oxygen from the volume of material to the surface. In strontium-containing samples La0,85Lix0,05Sr0,01CoO3-δ there are mainly ferromagnetic clusters Co3+-Co4+.

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Published
2022-08-16
How to Cite
DziazkoO., Nedilko S., ZaslavskyO., Kulichenko V., FesychI., BolotnikovaA., & Sabadash N. (2022). Synthesis and properties of polycharge phases in the system La-Li-M-Co-O (M=Ca, Sr, Ba). Physics and Chemistry of Solid State, 23(3), 435-442. https://doi.org/10.15330/pcss.23.3.435-442
Section
Scientific articles (Chemistry)