TY - JOUR

T1 - Functional properties and structure-size factor in La1.4A0.6Ni0.6Fe0.4O4+δ (A=Ca, Sr, Ba)

AU - Sukhanov, K.

AU - Gilev, A.

AU - Kiselev, E.

AU - Cherepanov, V.

N1 - This work was supported by the Ministry of Science and Higher Education of the Russian Federation [project registration No 123031300049–8].

PY - 2024/6/1

Y1 - 2024/6/1

N2 - La1.4Ca0.6Ni0.6Fe0.4O4+δ (LCNF), La1.4Sr0.6Ni0.6Fe0.4O4+δ (LSNF), La1.4Ba0.6Ni0.6Fe0.4O4+δ (LBNF) have been synthesized by the citrate-nitrate technique. The X-Ray powder diffraction (XRPD) results show an increase in the unit cell parameters and the unit cell volume with the increase in radius of the alkaline earth metal. The oxides possess oxygen excess equal to 0.06 at room temperature and demonstrate semiconductor-type behavior in the 25–950 °C range. The thermal expansion coefficient (TEC) determined in the 200–1000 °C interval decreases from 13.910−6 (A=Ca) to 13.2 10−6 К−1 (A=Ba) with increasing the dopant size. The electrochemical studies have revealed that the overall polarization resistance of La1.4A0.6Ni0.6Fe0.4O4+δ is equal to 1.85, 2.61 and 0.4 Ω cm2 at 800 °C for A=Ca, Sr and Ba, respectively. The predominant contribution to the polarization resistance is assigned to the charge transfer – ionic diffusion in the electrodes. It decreases in the row LSNF-LCNF-LBNF, which correlates with the increase in ionic conductivity in the oxides.

AB - La1.4Ca0.6Ni0.6Fe0.4O4+δ (LCNF), La1.4Sr0.6Ni0.6Fe0.4O4+δ (LSNF), La1.4Ba0.6Ni0.6Fe0.4O4+δ (LBNF) have been synthesized by the citrate-nitrate technique. The X-Ray powder diffraction (XRPD) results show an increase in the unit cell parameters and the unit cell volume with the increase in radius of the alkaline earth metal. The oxides possess oxygen excess equal to 0.06 at room temperature and demonstrate semiconductor-type behavior in the 25–950 °C range. The thermal expansion coefficient (TEC) determined in the 200–1000 °C interval decreases from 13.910−6 (A=Ca) to 13.2 10−6 К−1 (A=Ba) with increasing the dopant size. The electrochemical studies have revealed that the overall polarization resistance of La1.4A0.6Ni0.6Fe0.4O4+δ is equal to 1.85, 2.61 and 0.4 Ω cm2 at 800 °C for A=Ca, Sr and Ba, respectively. The predominant contribution to the polarization resistance is assigned to the charge transfer – ionic diffusion in the electrodes. It decreases in the row LSNF-LCNF-LBNF, which correlates with the increase in ionic conductivity in the oxides.

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85190064370

U2 - 10.1016/j.jallcom.2024.174369

DO - 10.1016/j.jallcom.2024.174369

M3 - Article

VL - 990

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 174369

ER -