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

Olexandr Dziazko; Sergiy Nedilko; Olexandr Zaslavsky; Vadym Kulichenko; Igor Fesych; Anastasiia  Bolotnikova; Nataliia  Sabadash

doi:10.15330/pcss.23.3.435-442

Authors

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

DOI:

https://doi.org/10.15330/pcss.23.3.435-442

Keywords:

LaCoO3, mixed oxides, lanthanum cobaltates, perovskite-like structure, surface morphology, FMR, diffuse reflection spectra, cluster spin glass

Abstract

Samples of La_1-3xLi_xM_2xCoO_3-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⁺-O^2--Co²⁺-O^2--Co²⁺-O^2— 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 La_0,85Li_x0,05Sr_0,01CoO_3-δthere are mainly ferromagnetic clusters Co³⁺-Co⁴⁺.

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