Investigation on structural, Mössbauer and ferroelectric properties of (1−x)PbFe0.5Nb0.5O3–(x)BiFeO3 solid solution

Abstract

a b s t r a c tIn this study, (1 À x)PbFe 0.5 Nb 0.5 O 3 (PFN)-(x)BiFeO 3 (BFO) multiferroic solid solutions with x ¼ 0.0, 0.1, 0.2, 0.3 and 0.4 were synthesized through single step solid state reaction method and characterized thoroughly through X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform InfraRed (FTIR), Raman, Mössbauer spectroscopy and ferroelectric studies. The room temperature (RT) XRD studies confirmed the formation of single phase with negligible amount of secondary phases (x ¼0.2 and 0.4). The zoomed XRD patterns of (1 À x)PFN-(x)BFO solid solutions showed the clear structural phase transition from monoclinic (Cm) to rhombohedral (R3c) at x ¼0.4. The Raman spectra of the (1 À x)PFN-(x)BFO solid solutions showed the composition dependent phase transition from monoclinic (Cm) to rhombohedral (R3c). With increasing x in PFN, the modes related monoclinic symmetry changes to those of rhombohedral symmetry. The RT Mössbauer spectroscopy results evidenced the existence of composition dependent phase transition from paramagnetic to weak antiferromagnetic ordering and weak antiferromagnetic to antiferromagnetic ordering. The Mössbauer spectroscopy showed paramagnetic behavior with a doublet for x ¼ 0.0, 0.1 and 0.2 are shows the weak antiferromagnetic with paramagnetic ordering. For x ¼ 0.3 and 0.4 shows the sextet pattern and it is a clear evidence of antiferromagnetism. The ferroelectric (P-E) loops at RT indicate the presence of small polarization, as the x concentration increases in PFN, the remnant polarization and coercive field were decreased, which may due to the increase in the conductivity and leaky behavior of the samples.

Strong Impact of Cr Doping on Structural and Magnetic Properties of Bi0.5La0.5Fe1−xCrxO3−δ

“…Such materials can thus be employed in various fields such as the design of sensitive electromagnetic sensors, fast transducers, ferromagnetic resonance devices controlled by an electric field, electrically tunable microwave devices, etc. [1][2][3][4][5] A pronounced (Received September 22, 2020; accepted November 21, 2020; published online January 4, 2021) magnetoelectric effect has been observed in many materials such as TbMnO 3 , 6 RMn 2 O 5 (R = Tb, Ho, Dy, Y, and Bi), and RbFe(MoO 4 ), 7 in which the formation of modulated magnetic order breaks the lattice inversion symmetry, thereby resulting in the occurrence of ferroelectricity. In such materials, the ferroelectric transition and magnetic ordering temperatures nearly coincide and are much lower than room temperature, restricting their practical applications.…”

Single phase synthesis, neutron diffraction and dielectric studies on 0.6PbFe0.5Nb0.5O3-0.4BiFeO3 multiferroic

“…Pb(NO 3 ) 2 and Bi 2 O 3 to compensate the evaporation of lead and bismuth loss during sintering. The detailed synthesis method and optimized conditions were explained elsewhere[7]. Single phase was confirmed by room temperature (RT) XRD (RIGAKU (Ultima IV model) with Cu K radiation of wavelength ( ) 1.5406 Å.…”