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Electric and magnetic properties of lanthanum barium cobaltite

AuthorsSzpunar, I.; Wachowski, S.; Miruszewski, T.; Dzierzgowski, K.; Górnicka, K.; Klimczuk, T.; Sørby, M.H.; Serra Alfaro, José Manuel; Balaguer, María
Issue Date23-Oct-2019
PublisherJohn Wiley & Sons
CitationJournal of American Ceramic Society 103(3): 1809-1818 (2020)
AbstractThe cubic BaLaCoO was synthesized using solid state reaction. The structural properties were determined by the simultaneous refinement of Synchrotron Powder X-ray Diffraction and Neutron Powder Diffraction data. Iodometric titration was used to examine the oxygen stoichiometry and average cobalt oxidation state. Low-temperature magnetic studies show soft ferromagnetic character of fully oxidized material, with θ = 198(3) K and µ = 2.11(2) µ. Electric measurements show the thermally activated nature of conductivity at low temperatures, whereas, due to the variable oxidation and spin state of cobalt, a single charge transport mechanism cannot be distinguished. Around room temperature, a wide transition from thermally activated conductivity to semi-metallic behavior is observed. Under the inert atmosphere, the oxygen content lowers and the cation ordering takes place, leading to coexistence of two, ordered and disordered, phases. As a result of this change, thermally activated conductivity is observed also at high temperatures in inert atmosphere.
Publisher version (URL)http://dx.doi.org/10.1111/jace.16865
Identifiersdoi: 10.1111/jace.16865
issn: 1551-2916
Appears in Collections:(ITQ) Artículos
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