Structural, dielectric, and ferroelectric characterization of lead-free calcium-cerium co-doped BaTiO3 ceramics

Juan Alberto Duran, University of Texas at El Paso

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-y O3; 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.^

Subject Area

Mechanical engineering|Nanotechnology|Materials science

Recommended Citation

Duran, Juan Alberto, "Structural, dielectric, and ferroelectric characterization of lead-free calcium-cerium co-doped BaTiO3 ceramics" (2016). ETD Collection for University of Texas, El Paso. AAI10250074.
http://digitalcommons.utep.edu/dissertations/AAI10250074

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