Abstract
The oxygen vacancies in perovskite-type dielectric ceramic influence the crystal structure and electrical properties of the ceramics significantly. In the work, the oxygen vacancies are investigated for typical barium titanate (BT) ceramic through a control of sintering atmosphere. A lattice deformation with preferred orientation of (111), (002) and (200) planes are observed due to the oxygen vacancies. The electrical properties are systematically studied through temperature-dependent dielectric constants, leakage currents, complex impedance spectra and breakdown strengthens (Eb). The results suggest that the oxygen vacancies account for low resistance, low Eb and large leakage current. Such variations are elaborated from the views of the energy band structure based on the DFT and the finite element simulation. Besides, the mechanical properties are calculated and the increased elastic constant (C) along z-axis and modulus of BT-Vo gives rise to the sharply decreased of piezoelectric constant (d33).
Published Version
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