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

• Published in: Journal of solid state chemistry 2001-06, Vol.159 (1), p.68-71
• Main Authors: Serpil Gönen, Z., Gopalakrishnan, J., Sirchio, Scott A., Eichhorn, B.W., Smolyaninova, Vera, Greene, Richard L.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Conductivity of specific materials; Electronic transport in condensed matter; Exact sciences and technology; Inorganic compounds; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics; Saturation moments and magnetic susceptibilities; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Transition-metal compounds; Water, oxides, hydroxides, peroxides
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.2001.9132

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.