Article ID Journal Published Year Pages File Type
1623004 Journal of Alloys and Compounds 2009 5 Pages PDF
Abstract
In this study, the effects of Cu and Ti substitution on the sintering behavior, substitution mechanism, resistivity and dielectric properties of (Zn)(Cux Tix Fe1.98−2x)O3.97 were investigated using X-ray diffractometer, scanning electron microscopy, and dilatometer. The results indicate that codoped Cu2+ and Ti4+ can effectively promote zinc ferrite densification. For the samples with x = 0-0.05, Cu2+ and Ti4+ ions dissolved into the spinel structure and mainly occupied the octahedral sites, which resulted in an increase in resistivity. For the specimen with x = 0.1 and 0.2, the Cu-rich and Zn-rich precipitates occurred at the grain boundary, leading to a decrease in resistivity. The variations in dielectric constant for samples with various x values as a function of frequency can be explained using the space charge polarization arising from the differences between the conductivity of the various phases present.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, ,