There are obviously temperature-dependent dielectric abnormalities in Fig. 2; that is the permittivity increases initially with temperature, reaches a maximum value and then decreases with further rise in temperature. Generally, dielectric permittivity is derived from dipolar, electronic, ionic,and interfacial polarizations. As for dipolar polarization,it is responsible for the rapid increase of the permittivity and strongly temperature-dependent. Zhang et al. have observed the existence of Fe in NiFeO.The presence of Fe,Ni and Zn dipolectively,and the rotational displacement of these dipoles results in orientational polarization that may be deemed as an exchange of electrons between the ions.Since the contribution due to p-type carriers should be smaller than the electronic exchange between Fe/Fe ions, n-type carriers will predominate in lower tempertures, contributing to the increase of permittivity with temperature,whereas carriers also becomes significant,thus finally leading to the decease of permittivity,since the two contributions oppose each other