Investigation of structural, morphological, optical, magnetic and dielectric properties of (1-x)BaTiO3/xSr0.92Ca0.04Mg0.04Fe12O19 composites

• Published in: Journal of magnetism and magnetic materials 2020-09, Vol.510, p.166933, Article 166933
• Main Authors: Slimani, Y., Almessiere, M.A., Shirsath, Sagar E., Hannachi, E., Yasin, Ghulam, Baykal, A., Ozçelik, B., Ercan, I.
• Format: Article
• Language: English
• Subjects: Barium titanates; Coercivity; Composite materials; Composites; Crystallites; Dielectric properties; Diffraction patterns; Electron diffraction; Energy gap; Ferrimagnetism; Ferroelectric materials; Ferroelectricity; Iron constituents; Magnetic properties; Magnetic saturation; Microstructure; Nanoparticles; Optical properties; Parameters; Phases; Remanence; Structure; Temperature effects
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2020.166933

•(1-x)BaTiO3/xSr0.92Ca0.04Mg0.04Fe12O19 composites were prepared.•The grains size of BTO phase decreased with increasing SrCaMg hexaferrite content.•The band gap energy (Eg) reduced with the increase in x ratio.•Ms, Mr and Hc increased with increasing x ratio.•Dielectric properties depend largely on x content and microstructure of composite. In the present work, we investigated the correlation between structure, microstructure, optical, electrical, dielectric and magnetic properties in composites based on ferrimagnetic Sr0.92Ca0.04Mg0.04Fe12O19 (noted SrCaMg) and ferroelectric BaTiO3 (noted BTO) phases in different ratio. Series of (1-x)BaTiO3/xSr0.92Ca0.04Mg0.04Fe12O19 mixtures (with x = 0.00, 0.25, 0.50, 0.75 and 1.00) were synthesized. The constituents were selected by taking into consideration the perspective ferroelectric and ferrimagnetic characteristics of BaTiO3 and Sr0.92Ca0.04Mg0.04Fe12O19, respectively. X-ray diffraction (XRD) investigations showed the co-existence of tetragonal BaTiO3 (noted BTO hereafter) and Sr0.92Ca0.04Mg0.04Fe12O19 hexagonal ferrite (noted SrCaMg HF) phases in the produced composites. The phase content of ferrimagnetic SrCaMg HF phase is increasing with increasing x content. The lattice parameter ‘a’ for both BTO and SrCaMg HF phases is almost constant with increasing the x content. However, the lattice parameter ‘c’ is decreasing for BTO phase and increasing for SrCaMg HF phase. The crystallites size (DXRD) is decreasing for BTO phase and increasing in SrCaMg HF phase as the x content increases. The homogeneous distribution of different phases was confirmed via scanning and transmission electron microscopies analyses and the corresponding selected area electron diffraction (SAED) patterns. On increasing the content of SrCaMg hexaferrite phase, the grains size of BTO phase is decreasing. The band gap energy (Eg) values were determined from the analysis of UV–vis diffuse reflectance spectra. BTO nanoparticles (x = 0.00) displays Eg value equal to 3.27 eV. It is found that Eg value is reduced with increasing the concentration of SrCaMg hexaferrite phase reaching values of 3.21, 3.08, 2.91 and 1.23 eV for x = 0.25, 0.50, 0.75 and 1.00, respectively. The saturation magnetization (Ms) and remanence (Mr) were increased with increasing the concentration of SrCaMg HF in the composite. Ms and Mr values are increased from about 0.09 and 0.02 emu/g for x = 0.00 to around 68.8 and 44.7 emu/g for x = 1.00. Compared to x = 0.00 sample, t