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Electric and magnetic properties of Lanthanum Barium Cobaltite

Szpunar, Iga; Wachowski, Sebastian; Miruszewski, Tadeusz; Dzierzgowski, Kacper; Górnicka, Karolina; Klimczuk, Tomasz; Sørby, Magnus Helgerud; Balaguer, María; Serra, José M.; Strandbakke, Ragnar; Gazda, Maria; Mielewczyk-Gryń, Aleksandra
Journal article; AcceptedVersion; Peer reviewed
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Szpunar2019_BLCO_postprint.pdf (769.2Kb)
Year
2019
Permanent link
http://urn.nb.no/URN:NBN:no-81162

CRIStin
1753545

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Appears in the following Collection
  • Kjemisk institutt [921]
  • Det matematisk-naturvitenskapelige fakultet [329]
  • CRIStin høstingsarkiv [16801]
Original version
Journal of The American Ceramic Society. 2019, 103 (3), 1809-1818, DOI: https://doi.org/10.1111/jace.16865
Abstract
The cubic Ba0.5La0.5CoO3‐δ 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 P = 198(3) K and µ eff = 2.11(2) µ B. 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.
 
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