The Effect of Grain Boundary Impedance on the Power Loss of Mn-Zn Ferrites over 1 MHz M.J. Tung, T.Y. Tseng, M.J. Tsay et W.C. Chang J. Phys. IV France, 07 C1 (1997) C1-129-C1-130 DOI: 10.1051/jp4:1997142