The effect of interionic distance on the properties of Al-doped Mn-Zn ferrites M. A. Amer, S. A. Saafan and S. M. Attia Eur. Phys. J. Appl. Phys., 35 3 (2006) 201-210 Published online: 23 August 2006 DOI: 10.1051/epjap:2006089