Influence of M2+ ions substitution on the structure of lanthanum hexaaluminates with magnetoplumbite structure |
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| Authors: | M. Gasperin M.C. Saine A. Kahn F. Laville A.M. Lejus |
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| Affiliation: | Laboratoire de Minéralogie-Cristallographie (LA 09) (Paris VI) 4, Place Jussieu 75230 (cxParis) Cedex 05, France;Laboratoire de Chimie Appliquée de l''Etat Solide (LA 302) ENSCP 11, rue Pierre et Marie Curie, 75231 Paris Cedex 05, France |
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| Abstract: | A series of compounds with the initial composition LaMxAl11O18+x has been studied with x ranging from 0 to 1, and M = Mn, Co, Cu. They exhibit a more or less distorted and defective magnetoplumbite arrangement. Their effective compositions have been determined by X-ray structure refinement. The smaller the content of M2+, the higher the disorder in the crystal lattice, the worse the crystal growth, and more intense the diffuse scattering in (001) planes. The role of M2+ is compared to that of M2+ stabilizing γ-Al2O3 to give MAl2O4 spinels. |
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| Keywords: | To whom correspondence should be addressed. |
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