Abd Elmadjid Khiat, Gheorghiu Felicia, Zerdali Mokhtar, Turcan Ina, Hamzaoui Saad
Laboratoire de Microscopie Electronique & Sciences des Matériaux, Université des Sciences et de Technologie d'Oran (USTO), BP 1505, El M'Naouer, Oran 31000, Algeria.
Research Center in Industrial Technologies (CRTI), P.O. Box 64 Cheraga, Algiers 16014, Algeria.
Materials (Basel). 2021 Feb 16;14(4):927. doi: 10.3390/ma14040927.
PbTiFeO ( = 0, 0.3, 0.5, and 0.7) ceramics were prepared using the classical solid-state reaction method. The investigated system presented properties that were derived from composition, microstructure, and oxygen deficiency. The phase investigations indicated that all of the samples were well crystallized, and the formation of a cubic structure with small traces of impurities was promoted, in addition to a tetragonal structure, as Fe concentration increased. The scanning electron microscopy (SEM) images for PbTiFeO ceramics revealed microstructures that were inhomogeneous with an intergranular porosity. The dielectric permittivity increased systematically with Fe concentration, increasing up to = 0.7. A complex impedance analysis revealed the presence of multiple semicircles in the spectra, demonstrating a local electrical inhomogeneity due the different microstructures and amounts of oxygen vacancies distributed within the sample. The increase of the substitution with Fe ions onto Ti sites led to the improvement of the magnetic properties due to the gradual increase in the interactions between Fe ions, which were mediated by the presence of oxygen vacancies. The PbTiFeO became a multifunctional system with reasonable dielectric, piezoelectric, and magnetic characteristics, making it suitable for application in magnetoelectric devices.
采用经典的固态反应法制备了PbTiFeO（ = 0、0.3、0.5和0.7）陶瓷。所研究的体系呈现出源于成分、微观结构和氧缺陷的特性。相研究表明，所有样品均结晶良好，随着铁浓度的增加，除了四方结构外，还促进了具有少量杂质痕迹的立方结构的形成。PbTiFeO陶瓷的扫描电子显微镜（SEM）图像显示出微观结构不均匀且存在晶间孔隙率。介电常数随铁浓度系统地增加，直至 = 0.7时仍在增加。复阻抗分析表明光谱中存在多个半圆，这表明由于样品内不同的微观结构和氧空位数量导致了局部电不均匀性。由于氧空位的存在介导了铁离子之间相互作用的逐渐增加，用铁离子取代钛位点导致磁性能得到改善。PbTiFeO成为具有合理介电、压电和磁特性的多功能体系，使其适用于磁电装置。
