Synthesis, Structure, Electrical and Magnetic Properties of Li Substituted La/BaMnO_3–δ

Abstract

The characterization of the polycrystalline La 0.7 Ba 0.3 MnO 3−δ (LBM) and La 0.7 Ba 0.3 Mn 0.9 Li 0.1 O 3−δ (LBMLi) samples synthesized via the polymerized complex, sol-gel technique indicates the formation of cubic perovskite crystal structure of both samples by sintering at 900 • C for 2 h. Substitution of Mn by Li having smaller ionic radius, leads to decrease the lattice constant and the cell volume which gives rise to a small shift and small intensity difference of the XRD patterns. A nanocrystalline structure of LBMLi with particles in the size range of 30-100 nm was obtained. The temperature dependence of electrical conductivity and magnetic susceptibility of LBM and LBMLi were studied. The smaller electrical conductivity values and the calculated magnetic properties of Li substituted the Mn in LBM sample were investigated.