Order-Disorder Mechanism and a Phenomenological Model in (Bi,Pb)-Sr-Ca-Cu-O
K. Elboussiria,b, M. Clinb and T. Raisa
aDépartment de Chimie, Faculté des Sciences, Université Hassan II Route d'Eljadida, Casablanca, Maroc
bDépartment de Physique, Faculté des Sciences, Université de Picardie 33 rue Saint Leu, 80039 Amiens, France
Received: August 19, 1996; in final form: October 23, 1996
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We established a relationship between the structures of the bismuth high Tc superconducting compounds and a symmetry of disordered perovskite type. This description which we propose, leads to considering the structures of these materials in terms of a commensurate superstructure obtained from a latent perovskite structure of space group Im3m. A phenomenological model was elaborated in order to describe the two types of modulations realized in these compounds.
DOI: 10.12693/APhysPolA.91.1097
PACS numbers: 74.20.-z