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Lithium Substitution in LaMnO3: Synthesis, Structure, and Properties of LaMn1−xLixO3 Perovskites

✍ Scribed by Z. Serpil Gönen; J. Gopalakrishnan; Scott A. Sirchio; B.W. Eichhorn; Vera Smolyaninova; Richard L. Greene

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
281 KB
Volume
159
Category
Article
ISSN
0022-4596

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✦ Synopsis

LaMn

؊x Li x O 3 perovskites have been synthesized by a 6ux method using LiCl. Substitution of Li> creates mixed-valent manganese according to the formula LaMn 3؉ 1؊3x Mn 4؉ 2x Li ؉ x O 3 , for 0.104x40.20. 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 e4ect of &90% at 50 K and 8.5 T. The e4ect of Li ؉ substitution in LaMnO 3 cannot be explained on the basis of a simple percolation model.

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