Ceramic Processing Route and Characterization of a Ni-Zn Ferrite for Application in a Pulsed-Current Monitor

Abstract

Abstract-Pulsed-current sensors require transducers constituted of magnetic materials with high magnetic permeability in a frequency range compatible with the period and the frequency of the current pulse. The use of ferrites in this application has the advantage of low cost and low losses in high frequencies. The aim of this work is to present a procedure for selection of the ceramic processing route of Ni-Zn ferrite for application in a pulsed-current sensor. The ferrite samples were prepared under different processing parameters and characterized in terms of microstructure, chemical analysis, complex magnetic permeability, and magnetic hysteresis. The chosen processing route included high energy milling of the pre-sintered powder, its disaggregation before sample forming, and sintering of the samples in air for 2 h at 1300 • C. Tests were performed and it was verified that using this processing route for the fabrication of the sensor's core it was possible to monitor pulses of 0.1-1.0 µs.

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

“…The compounds show the presence of Ni, Fe, Zn and O without precipitating cations. X-ray density (dx) was determined using the following relation 3 Dx ZM Na  where Z is the number of molecules per unit cell (Z = 8), "M" is the molecular weight and "N" is the Avogadro's number. The bulk density of the specimens has been determined accurately by the hydrostatic method and the percentage of porosity was also calculated.…”

“…3 ) solution. The neutralized solution was evaporated to dry ness by heating at 100˚C on a hot plate with continuous stirring, until it becomes viscous and finally formed a very viscous gel, increasing the temperature up to 200˚C lead to ignition of gel.…”

“…Because of their high resistivity, relatively high permeability and low eddy current loss [3,4]. These soft magnetic materials, crystallizes in the spinel structure of the type (Zn 1-x Fe x ) (Ni x Fe 2-x )O 4 , where the metallic cations Fe 3+ /Zn 2+ occupy the tetrahedral A sites, and the metallic cations Fe 3+ /Ni 2+ occupy the octahedral B sites [5,6].…”

Mechanical, Magnetic, and Microstructural Characterization of Ni0.9Co0.1Fe2O4 Produced by the Ceramic Method

“…Ferrites are magnetic ceramics that have many applications in electronics, including magnetic 1,2 , magnetoelectric 3 , and magnetomechanical sensors 4 . Among ferrites, the cobaltbased retains the highest magnetostriction levels, which makes them promising candidates for applications in magnetomechanical and magnetoelectric sensors 5,6 .…”

Copper Cobalt Magnetic Ceramic Materials Characterization at Terahertz Frequencies

“…The solid state reaction route is a state-of-the-art method for the fabrication of magnetic ceramics (Brito et al 2009) and achieves the desired composition of a ceramic by weighting powders previously calculated with stoichiometric formula of the ceramic. This process is reproducible if well controlled.…”