Abstract

The research in Zaragoza and Barcelona has been supported by Grant No. MAT88-0174, from the Comision Interministerial de Ciencia y Tecnologia. The research in Chicago has been supported by Grants No. DMR-8515224 and DMR-8815798 from the Solid State Chemistry Program, Division of Materials Research of the National Science Foundation. Cooperative work has been supported by Grant CCB-8504/001 from the American-Spain Joint Committee for Technical and Scientific Cooperation. M.C.M. also acknowledges a student fellowship from the Ministerio de Educacion y Ciencia.

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