University of California, Santa Barbara
Faculty Sponsor's Department(s):
Structural and Dielectric Properties of Tungsten Substituted Cobalt Ferrite Ceramics
Cobalt ferrite (referred to CFO) has been widely used in many applications including information storage systems, magnetic drug delivery, telecommunications, electronic and magneto-electronic devices. CFO is considered to be one of the most significant magnetic material that has good mechanical stability, low thermal conductivity, high dielectric constant, tunable magnetic properties, and high coercivity. Recent observation of coexistence of both magnetic ordering and ferroelectricity with giant dielectric constant in doped CFO motivated us to study the effect of tungsten incorporation as a part of our ongoing work on transition-metal-doped CFO materials. CoFe2-xWxO4 ceramics were prepared using standard high-temperature ceramics processing method. W content (x) was varied in the range of 0.0-0.3. The effect of W-substitution on the structure and dielectric properties of CFO was investigated. The crystal structure, surface morphology, chemical composition and dielectric properties of CoFe2-xWxO4 ceramics were evaluated using an array of analytical techniques. The results indicate that dielectric properties of CoFe2-xWxO4 ceramics can be tuned by controlling the W-content and processing conditions.