OBSERVATIONS OF STRUCTURAL DEFECTS IN FERRITES WITH SPINEL (Ni0.66Fe2.34O4) AND GARNET (Y3Fe5O12) STRUCTURES J. RABIER, G. RIVAUD, P. VEYSSIÈRE et B. PAVIS J. Phys. Colloques, 38 C1 (1977) C1-125-C1-129 DOI: 10.1051/jphyscol:1977124