Lisińska-Czekaj Agata, Czekaj Dionizy, Garbarz-Glos Barbara, Bąk Wojciech
Faculty of Mechanical Engineering, Gdańsk University of Technology, 11/12, Narutowicza St., 80-233 Gdańsk, Poland.
Institute of Technology, Pedagogical University of Cracow, 2 Podchorążych Str., 30-084 Kraków, Poland.
Materials (Basel). 2020 Nov 22;13(22):5286. doi: 10.3390/ma13225286.
Results of studies focusing on the electric behavior of BiFeTiO (BFTO) ceramics are reported. BFTO ceramics were fabricated by solid state reaction methods. The simple oxides BiO, TiO, and FeO were used as starting materials. Immittance spectroscopy was chosen as a method to characterize electric and dielectric properties of polycrystalline ceramics. The experimental data were measured in the frequency range Δ = (10-10) Hz and the temperature range Δ = (-120-200) °C. Analysis of immittance data was performed in terms of complex impedance, electric modulus function, and conductivity. The activation energy corresponding to a non-Debye type of relaxation was found to be = 0.573 eV, whereas the activation energy of conductivity relaxation frequency was found to be = 0.570 eV. An assumption of a hopping conductivity mechanism for BFTO ceramics was studied by 'universal' Jonscher's law. A value of the exponents was found to be within the "Jonscher's range" (0.54 ≤ ≤ 0.72). The -conductivity was extracted from the measurements. Activation energy for -conductivity was calculated to be = 0.78 eV, whereas the hopping activation energy was found to be = 0.63 eV. The obtained results were discussed in terms of the jump relaxation model.
报道了聚焦于铋铁钛氧化物（BFTO）陶瓷电学行为的研究结果。BFTO陶瓷通过固态反应法制备。使用简单氧化物BiO、TiO和FeO作为起始原料。选择导纳谱作为表征多晶陶瓷电学和介电性能的方法。实验数据在频率范围Δ =（10 - 10）Hz和温度范围Δ =（-120 - 200）°C内测量。根据复阻抗、电模量函数和电导率对导纳数据进行分析。发现对应于非德拜型弛豫的活化能为 = 0.573 eV，而电导率弛豫频率的活化能为 = 0.570 eV。通过“通用”琼舍尔定律研究了BFTO陶瓷的跳跃电导率机制假设。发现指数值在“琼舍尔范围”（0.54 ≤ ≤ 0.72）内。从测量中提取了 - 电导率。计算出 - 电导率的活化能为 = 0.78 eV，而跳跃活化能为 = 0.63 eV。根据跳跃弛豫模型对所得结果进行了讨论。
