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Optical and Electromagnetic Properties of LaCoO3:Li+;M2+(M = Ca, Sr, Ba)

Author:
Fesich, I. V.   Trachevsky, V. V.   Dziazko, A. G.   Nedilko, S. A.   Melnik, A. K.   


Journal:
Journal of Applied Spectroscopy


Issue Date:
2014


Abstract(summary):

Lanthanum cobaltates modified by alkaline-earth-metal (0.10 mol%) and lithium (0.05 mol%) ions were synthesized. The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of Li+ and M2+ (M = Ca, Sr, Ba) to the LaCoO3 matrix was shown to increase the unit-cell parameters, the optical band width (E-g), and the average Co oxidation state (Con+). Pure and doped LaCoO3 were characterized by the presence of paramagnetic centers as isolated structural and surface Co2+ ions and adsorption complexes [Co3 + a <-aEuro parts per thousand O (2) (-) ](center dot) on the surface of the oxide matrix at a concentration that increased in the order Ba > Sr > Ca. The cobaltates were found to possess Mott hopping conduction in the temperature range 77-298 K.


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