Electric field induced weak ferroelectricity in Ba_0.70Sr_0.30TiO₃, ceramics capacitors

Venkata Sreenivas PuliDepartment of Physics, University of Puerto Rico, San Juan, Puerto Rico, USA;Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana, USACorrespondence[email protected]

http://orcid.org/0000-0002-2074-0036

Dhiren K. PradhanDepartment of Physics, University of Puerto Rico, San Juan, Puerto Rico, USA

Shiva AdireddyDepartment of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana, USA

Douglas B. ChriseyDepartment of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana, USA

Ram S. KatiyarDepartment of Physics, University of Puerto Rico, San Juan, Puerto Rico, USA

ABSTRACT

Ba_0.70Sr_0.30TiO₃-(BST) ceramics were fabricated by conventional mixed oxide route. The structural phase transition, ferroelectric, dielectric and energy storage properties of BST ceramics capacitors were investigated. Electric field induced weak ferroelectricity is observed for BST ceramics. Temperature dependent dielectric property measurements of BST solid-solutions have shown a high dielectric constant and low dielectric loss. Room temperature breakdown field strength and energy densities were obtained from P-E loops. The recoverable energy density is 0.17 J/cm³ with dielectric breakdown strength as high as 150 kV/cm. BST ceramics have shown interesting energy densities; these might be the strong candidate materials for capacitor applications.

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Funding

This work was supported by the NSF-EFRI Award # 1038272 grant.

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Electric field induced weak ferroelectricity in Ba_0.70Sr_0.30TiO₃, ceramics capacitors