Article ID Journal Published Year Pages File Type
9834179 Journal of Magnetism and Magnetic Materials 2005 4 Pages PDF
Abstract
Oxide compounds, Mg0.5Cu0.5Fe2−xMxO4, in which M=La, Ga, Y and x=0 and 0.2, were prepared by self-combustion method and studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electric measurements. The XRD analysis evidenced that the compounds containing Y3+ and La3+ ions are pluriphasic, whereas the others are monophasic. An increase in average grain size and a decrease in the porosity in the Y- and La-substituted compounds were observed from SEM images. The electrical resistivity decreased by La and Y incorporation and increased by Ga incorporation. Concerning the humidity sensitivity of the electrical resistivity, the porous Ga-containing ferrite is the most sensitive to humidity change. For this ferrite the resistivity response time to humidity change is shorter.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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