Abstract
This study reports significant differences in the defect-mediated electrostrain in B-site trivalent ions (Fe3+ and Mn3+) doped Barium titanate based system. Electron Paramagnetic Resonance (EPR) Spectroscopy has been employed as a structural probe for understanding the symmetry of defects. Differences in the reorientation of the defect dipoles have been correlated with the electrostrain. Mechanism for the higher strain in Mn-doped system has also been explained.
Highlights
In ferroelectric oxides having perovskite ABO3 structure, on substitution of trivalent acceptors such as Mn3+ at the B4+-site, oxygen vacancies are created to maintain charge neutrality[1] as represented below;
Where M = Fe3+, Mn3+; MT i, a negatively charged acceptor at the B-site and VO, a doubly positively charged oxygen vacancy with respect to the neutral lattice according to Kroger and Vink
The most important factor in this defect dipole-mediated electrostrain is the mobility of the point defects
Summary
In ferroelectric oxides having perovskite ABO3 structure, on substitution of trivalent acceptors such as Mn3+ at the B4+-site, oxygen vacancies are created to maintain charge neutrality[1] as represented below;. Influence of defect mobility on electrostrain in acceptor-doped Ba0.80Sr0.20TiO3
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