Date of Award
2013-01-01
Degree Name
Master of Science
Department
Mechanical Engineering
Advisor(s)
Chintalapalle V. Ramana
Abstract
The effect of hafnium ion (Hf4+) incorporation in cobalt ferrite (CFO) was studied. Samples of Hf substituted CFO ceramic (CoFe2-xHfxO4), were synthesized in the laboratory with hafnium concentrations ranging from x=0.000 to x=0.200. X-ray diffraction scans show that the Hafnium CFO crystalizes in the inverse spinel phase. Inclusion of hafnium causes lattice expansion, increasing the lattice parameter from 8.374 í? for pure CoFe2O4 to 8.391 í? for the highest concentration of hafnium tested (x=0.020). The dielectric properties of CFO are greatly enhanced by inclusion of hafnium. The enhancement is due to the distortion on the lattice from the larger Hf-ions substituting the smaller Fe-ions. Frequency variation of the dielectric properties is well modeled by the modified Debye function, which takes into account multiple ions contributing to relaxation.
Language
en
Provenance
Received from ProQuest
Copyright Date
2013
File Size
43 pages
File Format
application/pdf
Rights Holder
Stephen Josiah Wells
Recommended Citation
Wells, Stephen Josiah, "Effect Of Hafnium-Incorporation On The Microstructure And Dielectric Properties Of Cobalt Ferrite Ceramics" (2013). Open Access Theses & Dissertations. 1757.
https://scholarworks.utep.edu/open_etd/1757
Included in
Electrical and Electronics Commons, Materials Science and Engineering Commons, Mechanical Engineering Commons, Mechanics of Materials Commons