COMPOSITION, MAGNETIC PROPERTIES AND STRUCTURES OF TWO TYPES OF HEXAGONAL FERRITES : Zn SUBSTITUTED SrMn2-W AND BaCo-Y G. Litsardakis, A. Collomb, M. A. Hadj Farhat, D. Samaras, J. Pannetier, J. P. Mignot et J. C. Joubert J. Phys. Colloques, 49 C8 (1988) C8-935-C8-936 DOI: 10.1051/jphyscol:19888426