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Advances in Molten Salts

ISSN:
1-56700-142-4 (Print)

Reactivity in molten oxonitrates of lanthanum and magnanese salts. Synthesis of La1-x MnO3

R. Lyonnet
LESI UPRES A no 5079, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne cedex

C. Ciaravino
LESI UPRES A no 5079, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne cedex

P. Marote
LESI UPRES A no 5079, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne cedex

J.P. Scharff
LESI UPRES A no 5079, Universite Claude Bernard Lyon 1, F-69622 Villeurbanne cedex

B. Durand
Laboratoire de Chimie des Materiaux Inorganiques et Energetiques, UPRES A 5070, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex 04, France

J. P. Deloume
Laboratoire Energetique et Synthese Inorganique, UPRES A 5079, Universite Claude Bernard Lyon-1, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne cedex, France

Abstract

The reactivity of each lanthanum and manganese nitrate and chloride is studied in four molten media, NaN03, NaN02, KN03 and KN02 at 500°C. The lanthanum salts produce mainly hydroxide and oxychloride. The manganese salts give a variety of compounds, mainly oxides and also oxychloride and sodium manganate. The reaction of the mixed metal salts leads to the perovskite non-stoichiometric La1-xMn03. The results can be interpreted in terms of acido-basicity of the lanthanum ion and of oxidation pathway of the manganese species. The simultaneous presence of both metal ions in the media forces Lal-xMn03 to precipitate. The obtained crystallites are nanosized with a large surface area.