Date of Award
2016-01-01
Degree Name
Master of Science
Department
Mechanical Engineering
Advisor(s)
Ramana V. Chintalapalle
Abstract
Structure, morphology, and regulation of the dielectric properties via close-composition intervals is demonstrated for variable-cerium, constant-calcium co-doped barium titanate (Ba0.80Ca0.20CeyTi1-yO3; y=0.0-0.25; referred to BCCT). The effect of variable Ce-content on the structure and dielectric properties of BCCT is investigated. X-ray diffraction spectra confirms the studied samples are mainly in BT tetragonal phase with a small secondary phase detected as CaTiO3 in BCCT for y = 0.20 and 0.25. However, the lattice parameter reduction was evident with increasing Ce-content. Composition-driven dielectric constant leap (4,000-5,500) was observed from intrinsic BCT to BCCT for (y = 0.0-0.04). The temperature dependent dielectric constant showed a transition temperature, which decreased with progressive addition of Cerium content. The Curie point, Tc, diminishes from 120 to 50 °C for (y = 0.0-0.04) showing a decrease in the ferroelectric to paraelectric state. Hence, the solubility limit for cerium in BCCT ceramics may have been reached.
Language
en
Provenance
Received from ProQuest
Copyright Date
2016
File Size
74 pages
File Format
application/pdf
Rights Holder
Juan Alberto Duran
Recommended Citation
Duran, Juan Alberto, "Structural, Dielectric, and Ferroelectric Characterization of Lead-Free Calcium-Cerium Co-Doped BaTiO3 Ceramics" (2016). Open Access Theses & Dissertations. 641.
https://scholarworks.utep.edu/open_etd/641
Included in
Materials Science and Engineering Commons, Mechanical Engineering Commons, Mechanics of Materials Commons, Nanoscience and Nanotechnology Commons