Comparative Study of Structural and Electrical Study of Bismuth Doped At La and Mn Site of La0.7Sr0.3mno3
Abstract
We report the structural and electrical properties of
polycrystalline bismuth (Bi) doped La0.7Sr0.3MnO3 (x = 0, 0.1 and
0.2) at La(A) and Mn(B) site. Refinement of X-ray powder
diffraction patterns show that all samples crystallize in
Rhombohedral structure with R-3C space group. There is
decrease in unit cell volume as well as metal to insulator
transition temperature TMI in both site Bi doping. It is found that
values of resistivity are higher at B site doping compared that of
A site for all concentrations. It is found that the value of TMI is a
233K and 227K and resistivity at peak is 184m Ω-cm and
675mΩ-cm in La and Mn doped samples respectively for x=0.1.
The competition between the Mn–O–Mn double exchange and
the Bi–O–Mn super-exchange of Mn3+ by Bi3+ may explain the
increase in resistivity
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