Electric and magnetic properties of lanthanum barium cobaltite

Iga Szpunar; Sebastian Wachowski; Tadeusz Miruszewski; Kacper Dzierzgowski; Karolina Górnicka; Tomasz Klimczuk; Magnus Helgerud Sørby; María Balaguer; José M. Serra; Ragnar Strandbakke; Maria Gazda; Aleksandra Mielewczyk-Gryń

doi:10.1111/jace.16865

Electric and magnetic properties of lanthanum barium cobaltite

Iga Szpunar, Sebastian Wachowski, Tadeusz Miruszewski, Kacper Dzierzgowski, Karolina Górnicka, Tomasz Klimczuk, Magnus Helgerud Sørby, María Balaguer, José M. Serra, Ragnar Strandbakke, Maria Gazda, Aleksandra Mielewczyk-Gryń

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The cubic Ba_0.5La_0.5CoO_3-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.

Original language	English
Pages (from-to)	1809-1818
Number of pages	10
Journal	Journal of the American Ceramic Society
Volume	103
Issue number	3
DOIs	https://doi.org/10.1111/jace.16865
State	Published - Mar 1 2020
Externally published	Yes

Funding

The authors acknowledge the skillful assistance from the staff of the Swiss‐Norwegian Beamline (SNBL), at the European Synchrotron Radiation Facility (ESRF), Grenoble, France. The research has been supported by the National Science Centre Poland under m.ERA.net funding scheme (2016/22/Z/ST5/00691). Funding from the Spanish Government (PCIN‐2017‐125, RTI2018‐102161) is kindly acknowledged. Financial and scientific contributions from the Research Council of Norway (Grant no 272797 “GoPHy MiCO”) through the M‐ERA.NET Joint Call 2016. The authors acknowledge the skillful assistance from the staff of the Swiss-Norwegian Beamline (SNBL), at the European Synchrotron Radiation Facility (ESRF), Grenoble, France. The research has been supported by the National Science Centre Poland under m.ERA.net funding scheme (2016/22/Z/ST5/00691). Funding from the Spanish Government (PCIN-2017-125, RTI2018-102161) is kindly acknowledged. Financial and scientific contributions from the Research Council of Norway (Grant no 272797 “GoPHy MiCO”) through the M-ERA.NET Joint Call 2016.

Keywords

electrical properties
magnetic materials/properties
perovskites

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10.1111/jace.16865

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title = "Electric and magnetic properties of lanthanum barium cobaltite",

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 θP = 198(3) K and µeff = 2.11(2) µB. 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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doi = "10.1111/jace.16865",

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AU - Szpunar, Iga

AU - Wachowski, Sebastian

AU - Miruszewski, Tadeusz

AU - Dzierzgowski, Kacper

AU - Górnicka, Karolina

AU - Klimczuk, Tomasz

AU - Sørby, Magnus Helgerud

AU - Balaguer, María

AU - Serra, José M.

AU - Strandbakke, Ragnar

AU - Gazda, Maria

AU - Mielewczyk-Gryń, Aleksandra

PY - 2020/3/1

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N2 - 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 θP = 198(3) K and µeff = 2.11(2) µB. 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.

AB - 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 θP = 198(3) K and µeff = 2.11(2) µB. 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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Electric and magnetic properties of lanthanum barium cobaltite

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