SPIN RELAXATION EFFECTS IN Fe(NO3)3 AND Fe(ClO4), FROZEN SOLUTIONS AND IN Fe(ClO4)3 CRYSTAL HYDRATES F. SONTHEIMER, D.L. NAGY, I. DÉZSI, T. LOHNER, G. RITTER, D. SEYBOTH et H. WEGENER J. Phys. Colloques, 35 C6 (1974) C6-443-C6-448 DOI: 10.1051/jphyscol:1974690