Abstract
Wolframite-structured NaFe(WO4)2 (NFeW) micron sized particles with rod-type morphology were synthesized by sol–gel method with lower temperature and calcination time. The crystallization and melting temperature of the NFeW were noticed in thermal analysis. Rietveld refinement of powder X-ray diffraction data confirms the formation of high purity NFeW with monoclinic structure of P2/c space group. The evolution of wolframite structure with respect to different thermal treatments was verified by Fourier transform infrared and Raman analysis. The optical band-gap of NFeW was calculated to be 2.3 eV, a shift towards lower energy compared to other double tungstates. The field-emission scanning electron microscope images revealed rod-shape topography of the NFeW with a uniform size. Magnetic hysteresis measurements of NFeW powder exhibited the paramagnetic ordering at room temperature and antiferromagnetic ordering below 10 K. This antiferromagnetic ordering was further confirmed by Neel’s transitions point in both zero field cooled and field cooled magnetization measurements. Electron paramagnetic resonance measurement of NFeW showed Fe3+ ion symmetry with environment and interaction between Fe3+ ions. From the impedance spectroscopy analysis, the ac conductivity contribution was interpreted using the modified Jonscher’s power law and the activation energy was found to be 0.84 eV.
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Acknowledgements
This work is funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT—Portuguese Foundation for Science and Technology under the project UID/CTM/50025/2013. One of the authors Dr. A. Durairajan acknowledges the projects BPD/UI96/ 7799/2017 and BPD/UI96/ 7799/2018; 50025: I3N for the post-doctoral grant.
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Durairajan, A., Ramana, E.V., Teixeira, B. et al. Magnetic and electric characterizations of sol–gel-derived NaFe(WO4)2 rods. Appl. Phys. A 124, 618 (2018). https://doi.org/10.1007/s00339-018-2028-0
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DOI: https://doi.org/10.1007/s00339-018-2028-0