Dear people of the Rietveld club, please delete my previous message addressed by error to the Rietveld club. Dr. Gustavo A. Cifredo Chacon Universidad de Cadiz Departamento de Ciencias de los Materiales e Ingenieria Metalurgica y Quimica Inorganica CASEM 11510 Puerto Real, Cadiz, SPAIN phone: 956 470856
