Fine powders of Y 1−x Sm x FeO 3 (x = 0, 0.05, 0.10, 0.15) were synthesized via citrate based sol-gel route. While the as synthesized powders were amorphous, the calcined (900 °C/8 h) powders were confirmed to be polycrystalline by x-ray powder diffraction (XRD) studies. The calcined powders were found to crystallize in an orthorhombic structure associated with the lattice parameters a = 5.59 Å, b = 7.60 Å, c = 5.28 Å. These lattice parameters increased with the increase in Sm 3+ content at yttrium sites. The strain that was obtained by the Williamson-Hall method increased with the increase in dopant (Sm 3+ ) concentration vis-à-vis a decrease in crystallite size. Diffuse reflectance spectroscopic studies suggest an increase in band gap as Sm doping level increased. Significant enhancement in magnetization associated with a decrease in coercive field accompanied by a transition from anti-ferromagnetic to soft ferromagnetic behaviour in Sm doped YFeO 3 were encountered. It is hoped that these materials with the enhanced magnetic properties could be of potential use for multifarious applications.
The work investigates the impact of doping (Sm3+, Gd3+ at Y3+ site and Ti4+ at Fe3+ site respectively) on structural, optical and magnetic properties of YFeO3.
Critical examination of data from β-decays of 154Nd, 2.68m 154Pm and 1.73m 154Pm is undertaken with a view to unravelling the 15461Pm93 level structures. Guidance is sought from evaluation of two-quasi-particle (2qp) bandhead energies based on the mapping of the physically admissible configuration space with inputs from observed 1qp energies in the core odd-mass isotope and isotone, and the experimental 2qp level energies in the neighbouring odd–odd nuclei. Our analysis leads us to conclude that the 2.68m isomer is the 154Pm ground state (gs) with J π = 4+ and 2qp configuration 4+{p:5/2[532] ⊗ n:3/2[521]}. The 1.73m 154Pm isomer is assigned J π = 1− and 2qp configuration 1−{p:5/2[413] ⊗ n:3/2[521]}; our calculations place it (30 ± 10) keV above the 4+ gs. Structures of several other 154Pm levels are also discussed. These investigations again support our earlier stated proposition that the log ft values, by themselves, cannot yield the relative parity of β-connected states.
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