Yb MnO3 Research Articles

Doping effect on structural, morphological and magnetic properties of YbMnO3 compound with non-magnetic Lutetium ion

The present study presents an analysis of the structural, morphological and magnetic properties of multiferroic YbMnO3 (YBO) due to Lu doping. YbMnO3 (YBO) and Yb0.85Lu0.15MnO3 (YBLu) were prepared using a conventional solid state reaction method. The investigation employed techniques such as X-ray diffraction (XRD), Field Effect Scanning Electron Microscope (FE-SEM), Raman spectroscopy and magnetic measurements. The X-ray diffraction (XRD) patterns of both samples confirmed the growth of these samples in a polycrystalline single hexagonal phase having space group P63cm with no detectable impurities. The evaluation of crystalline parameters, such as lattice parameters, cell volume, specific bond lengths etc. has been carried out. The Lu-doped sample shows a minor reduction in cell parameters and cell volume which can be attributed to the smaller ionic radius of Lu3+. Lu doping in YBO results in slight shift in Raman Lines towards slightly frequencies which is the result of a small change in the average bond length. The effective magnetic moment of YBLu is found to decrease ∼6 % and the antiferromagnetic ordering temperature TN nearly remains the same because Lu3+ has zero magnetic moment. Both samples show ferri/ferromagnetic behaviour below 5 K due to the ordering of the Yb3+ lattice.

Structure evolution of Yb substituted PCMO manganites

In the present investigation, we have made an effort to synthesize and study the structure of Yb substituted Pr0.67-xYbxCa0.33MnO3 (PYCMO) [x = 0.0, 0.09, 0.2, 0.4 and 0.6] manganites. The tolerance factor estimated decreases while the A-site variance increases with an increase in Yb concentration. This gives an insight of the impact of Yb on the structure of the system. Detailed Rietveld analysis of the X-ray diffraction pattern suggests the structural changes to be temperature sensitive and a mixed-phase is found to evolve as the concentration of Yb increases. The parasitic secondary phase has been identified as YbMnO3 (YMO) which crystallizes in hexagonal structure. A strong immiscibility of the orthorhombic and hexagonal phases has been evident from the two-phase Rietveld analysis.

Compositional Dependence of Ferroelectric Properties for (Y,Yb)MnO3 Thin Films Prepared by Chemical Solution Deposition

The (Y,Yb)MnO3 thin films were prepared using alkoxy-derived precursor solutions. The hexagonal phase crystallized in Ar atmosphere and the films had high crystallinity and high degrees of c-axis orientation. The substitution of Y by Yb in YMnO3 lowered the crystallization temperature. The Y0.5Yb0.5MnO3 and YbMnO3 films crystallized at 700°C had c-axis orientation and showed the saturated P-E hysteresis loop. The remanent polarization and coercive field were 1.7 μC/cm2 and 100 kV/cm for Y0.5Yb0.5MnO3 film, and 2.1 μC/cm2 and 100 kV/cm for YbMnO3 film, respectively. The Y0.5Yb0.5MnO3 film crystallized at 700°C showed good fatigue property.