Structural and electrical properties of Sn substituted double sintering   derived Ni-Zn ferrite
  The Sn substituted Ni-Zn ferrites were synthesized by the standard double sintering technique using nano powders of nickel oxide (NiO), zinc oxide (ZnO), iron oxide (Fe2O3) and tin oxide (SnO2). The structural and electrical properties have been investigated by the X-ray diffraction, scanning electron microscopy, DC resistivity and dielectric measurements. Extra intermediate phase has been detected along with the inverse cubic spinel phase of Ni-Zn ferrite. Enhancement of grain size is observed in Sn substituted Ni-Zn ferrites. DC resistivity as a function of temperature has been investigated by two probe method. The DC resistivity was found to decrease whereas the dielectric constants increase with increasing Sn content in Ni-Zn ferrites. The dielectric constant of the as prepared samples is high enough to use these materials in miniaturized memory devices based capacitive components or energy storage principles. 
M.A. Ali, M.N.I. Khan, F.-U.-Z. Chowdhury, S.M. Haque, M.M. Uddin
cond-mat.mtrl-sci