Journal Articles - Natural Science - 2022

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Browsing Journal Articles - Natural Science - 2022 by Subject "Conduction mechanism"
  • Publication
    Magnetic and transport behaviors of Co substitution in La0.7Sr0.3MnO3 perovskite
    ( 2022)
    L.T.T. Ngan
    ;
    N.T. Dang
    ;
    N.X. Phuc
    ;
    L.V. Bau
    ;
    N.V. Dang
    ;
    D.H. Manh
    ;
    P.H. Nam
    ;
    L.H. Nguyen
    ;
    P.T. Phong
    The magnetic and electrical properties of the substituted La0.7Sr0.3Mn1-xCoxO3 perovskite (0 ≤ x ≤ 1) were studied. Analysis of the average spin value obtained from inverse magnetic susceptibility using Curie–Weiss law for the samples suggested Co4+ ions were in the high spin state, whereas the spin state of Co3+ ions transformed from high spin to intermediate-spin state at x= 0.8. The metallic conduction behavior of the x = 0 and x = 1 samples was analyzed using the empirical equation , reflecting the importance of electron–magnon scattering effects similarly to other manganites. All the other samples displayed semiconductor-like behavior throughout the studied temperature range. The resistivity data in semiconducting La0.7Sr0.3Mn1-xCoxO3 could be fitted to the model of variable range hopping, and both hopping distance and average hopping energy reduced with increasing doped Co concentration.