Lithium substitution in LaMnO<SUB>3</SUB>: synthesis, structure, and properties of LaMn<SUB>1-x</SUB>Li<SUB>x</SUB>O<SUB>3</SUB> perovskites
- Serpil Gonen, Z.
- Gopalakrishnan, J.
- Sirchio, Scott A.
- Eichhorn, B. W.
- Smolyaninova, Vera
- Greene, Richard L.
DOIAbstract
LaMn1-xLixO3 perovskites have been synthesized by a flux method using LiCl. Substitution of Li+ creates mixed-valent manganese according to the formula LaMn3+1-3xMn4+2xLi+xO3, for 0.10≤x≤0.20. At low values of x, additional vacancies are found on the perovskite A and B sites. All the members crystallize in the rhombohedral (R-3c) perovskite structure and are semiconducting with no long-range magnetic order. The samples show spin-glass-like short-range magnetic correlations at low temperatures and Curie-Weiss behavior above ca. 150 K. The x=0.05 and 0.10 samples show a magnetoresistive effect of ~90% at 50 K and 8.5 T. The effect of Li+ substitution in LaMnO3 cannot be explained on the basis of a simple percolation model
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