Phase modifications and functional properties of Ba(Ti1-xFex)O3-x/2 diluted magnetic ceramics

In the present study, polycrystalline samples of BaTi1-xFexO3-x/2 (0≤x≤0.02) have been synthesized by solid state reaction technique. X-ray diffraction analysis (Fig.1(a)) and Rietveld refinement have shown that by doping... [ view full abstract ]

In the present study, polycrystalline samples of BaTi_1-xFe_xO_3-x/2 (0≤x≤0.02) have been synthesized by solid state reaction tech^{nique. X-ray diffraction analysis (Fig.1(a)) and Rietveld refinement have shown that by doping with Fe in Barium Titanate, the composition with x=0÷1% presents a tetragonal crystalline symmetry, while a superposition of tetragonal and hexagonal phases was found for composition with x= 1.5 and 2% Fe. The dielectric properties of BaTi_1-xFe_xO_3-x/2 ceramics exhibit a shift in transition temperature strongly dependent upon the dopant concentration and a decrease of dielectric permittivity with increasing Fe concentration (Fig.1(b)). The EPR analysis for the compositions x=0.5% and x=2% supports the X-ray diffraction results and it was found that paramagnetic Fe3+ ions reside at the Ti lattice sites. The presented results have indicated that the BaTi_1-xFe_xO_3-x/2 system can be considered as a possible candidate for modern electronics applications and functionalized materials.}

Fig.1. (a) The X-ray diffraction patterns and (b) Temperature dependence of the real part of the dielectric constant for BaTi_1-xFe_xO₃ (0≤x≤0.02) ceramics

Acknowledgements: This work was financial supported by UEFISCDI project no PN-III-P1-1.1-TE-2016-0499