Magnetic and dielectric properties of Co–Zn ferrite

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 178; no. 16; pp. 1040 - 1047
• Main Authors: Slatineanu, Tamara, Iordan, Alexandra Raluca, Oancea, Victor, Palamaru, Mircea Nicolae, Dumitru, Ioan, Constantin, Cristin Petrica, Caltun, Ovidiu Florin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.09.2013
• Subjects: Dielectric property; Ferrite; FT-IR; Sol–gel method; VSM; XRD; VSM; FT-IR; Ferrite; XRD; Sol–gel method; Dielectric property
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2013.06.014

•Co–Zn ferrite series are synthesized by sol–gel method using tartaric acid.•XRD patterns reveal pure spinel structure and the crystallite size is max. 68nm.•The optimal dielectric properties belong to Co0.2Zn0.8Fe2O4 sample.•The maximum saturation magnetization value was found for Co0.8Zn0.2Fe2O4 sample. Nanocrystalline powders of Co substituted Zn ferrite with the chemical formula CoxZn1−xFe2O4 (x=0, 0.2, 0.4, 0.6, 0.8, 1) were synthesized by sol–gel autocombustion method using tartaric acid as fuel agent. The samples were sintered in static air atmosphere for 7h at 773K, 7h at 973K and 10h at 1173K. The organic phase extinction and the spinel phase formation were monitored by means of Fourier transform infrared spectroscopy. The X-ray diffraction patterns analysis confirmed the spinel single phase accomplishment. Crystallite size, average grains size, lattice parameter and cation distribution were estimated. Magnetic behavior of the as-obtained samples by means of M-H hysteresis measurements was studied at room temperature. Permeability and dielectric permittivity at room temperature versus frequency was the subject of a comparative study for the CoxZn1−xFe2O4 series. In agreement with the proposed cation distribution the sample with Co0.8Zn0.2Fe2O4 formula exhibits the optimal magnetic and dielectric properties.