Deciphering the leakage conduction mechanism of BiFeO 3–BaTiO 3 lead-free piezoelectric ceramics

• DOI: 10.26599/jac.2023.9220792
• Publication Date: 2023-08-01T00:58:44Z
• Authors: Mengping Xue; Yucheng Tang; Zhihang Shan; Yijin Hao; Xiaoxiao Zhou; Xiaoqi Gao; Hezhang Li; Jun Pei; Boping Zhang
• Keywords: Atmospheric temperature range

BiFeO₃-BaTiO₃ based piezoelectric ceramic is a kind of high-temperature lead-free with great development prospects due to its high Curie temperature <em>T</em>_C and excellent electrical properties. However, the large leakage current limits performance improvement practical application. In this work, DC (direct current) test, AC (alternating impedance Hall tests were used investigate conduction mechanisms 0.75BiFeO₃-0.25BaTiO₃ over wide region. range RT−150 °C, Ohmic plays predominant effect, main carriers are <em>p</em>-type holes activation energy (<em>E</em>_a) 0.51 eV. When <em>T</em> &gt; 200 <em>E</em>_a value calculated from data 1.03 eV oxygen vacancies as cause conductivity. The diffusion behavior thermally activated affected by crystal symmetry, vacancy concentration distribution, dominating internal mechanism. Deciphering three ranges would pave way for further improving insulation properties ceramics.