ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Structure, Electrical Conductivity, and Dielectric Constant of Ni_1-xZn_xFe₂0₄

S. M. Hammad

National Research Center, Physics Department, Dokki, Cairo, Egypt

Abstract: The structural, electrical, and dielectric properties were studied at room temperature for the Ni_1-xZn_xFe₂0₄  ferrite samples (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) prepared by the usual ceramic technique. The analysis of X-ray diffraction patterns proved that the studied samples have single-phase cubic spinel structure. The lattice constant a, radius of tetrahedral ion r_tet, oxygen positional parameter u, relative permittivity ε_r', dielectric loss tg δ, DC σ_dc(T) and real AC σ_ac' (ω, T) electrical conductivities, and parameters n and B for the electrical conductivity σ₂(ω, T) increase while the radius of octahedral ion r_oct decreases on increasing Zn²⁺ ion addition. σ_ac' (ω, T) increases while ε_r' and tg δ decrease on increasing the frequency of the applied AC electric field. Empirical formulae were suggested for the compositional dependence of each of the electrical conductivities δ and parameters n and B, respectively.

Full paper in Portable Document Format: 522a107.pdf

Chemical Papers 52 (2) 107–113 (1998)