Pędzich Zbigniew, Lisińska-Czekaj Agata, Czekaj Dionizy, Wojteczko Agnieszka, Garbarz-Glos Barbara
Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, AGH University of Krakow, 30-059 Krakow, Poland.
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, 11/12, Narutowicza St., 80-233 Gdansk, Poland.
Materials (Basel). 2025 Aug 6;18(15):3690. doi: 10.3390/ma18153690.
BiFeTiO (BFTO) ceramics were synthesized via a solid-state reaction route using stoichiometric amounts of BiO, TiO, and FeO powders. A thermal analysis of the powder mixture was conducted to optimize the heat treatment parameters. Energy-dispersive X-ray spectroscopy (EDS) confirmed the conservation of the chemical composition following calcination. Final densification was achieved through hot pressing. The crystal structure of the sintered samples, examined via X-ray diffraction at room temperature, revealed a tetragonal symmetry for BFTO ceramics sintered at 850 °C. Electron backscatter diffraction (EBSD) provided detailed insight into the crystallographic orientation and microstructure. Broadband dielectric spectroscopy (BBDS) was employed to investigate the dielectric response of BFTO ceramics over a frequency range of 10 mHz to 10 MHz and a temperature range of -30 °C to +200 °C. The temperature dependence of the relative permittivity (ε) and dielectric loss tangent (tan δ) were measured within a frequency range of 100 kHz to 900 kHz and a temperature range of 25 °C to 570 °C. The impedance data obtained from the BBDS measurements were validated using the Kramers-Kronig test and modeled using the Kohlrausch-Williams-Watts (KWW) function. The stretching parameter () ranged from ~0.72 to 0.82 in the impedance formalism within the temperature range from 200 °C to 20 °C.
通过使用化学计量的BiO、TiO和FeO粉末，采用固态反应路线合成了BiFeTiO（BFTO）陶瓷。对粉末混合物进行了热分析，以优化热处理参数。能量色散X射线光谱（EDS）证实了煅烧后化学成分的守恒。通过热压实现了最终致密化。在室温下通过X射线衍射检查烧结样品的晶体结构，结果表明在850℃烧结的BFTO陶瓷具有四方对称性。电子背散射衍射（EBSD）提供了对晶体取向和微观结构的详细洞察。采用宽带介电谱（BBDS）研究了BFTO陶瓷在10 mHz至10 MHz频率范围和-30℃至+200℃温度范围内的介电响应。在100 kHz至900 kHz频率范围和25℃至570℃温度范围内测量了相对介电常数（ε）和介电损耗正切（tan δ）的温度依赖性。从BBDS测量获得的阻抗数据使用Kramers-Kronig测试进行了验证，并使用科尔劳施-威廉姆斯-瓦茨（KWW）函数进行了建模。在200℃至20℃温度范围内，阻抗形式中的拉伸参数（）范围约为0.72至0.82。
