Journal of the Australian Ceramic Society

, Volume 54, Issue 2, pp 307–316 | Cite as

Structural, electrical conductivity and dielectric relaxation behavior of LiHf2(PO4)3 ceramic powders

  • Tasiu Zangina
  • Jumiah Hassan
  • Raba’ah Syahidah Azis
  • Khamirul Amin Matori
  • Alex See
  • Ibrahim Mustapha Alibe
  • Sadiq Umar
Research
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Abstract

Lithium hafnium phosphate LiHf2(PO4)3 (LHP) was synthesized via solid-state synthesis technique. The sintering behavior, structure, and phase composition of the as-prepared sample was analyzed using X-ray diffraction (XRD) characterization technique. The XRD-Rietveld refinement analysis showed that after sintering at low temperatures 500 to 1000 °C, it exhibited various secondary phases. However, a single phase was observed as the sintering temperature increases from 1100 to 1200 °C. LHP sintered at 1100 °C produced real features of sodium superionic conductor type (NASICON-type) with hexagonal crystal axis indicating R-3c space group. The electrical properties were studied using impedance spectroscopy technique. Frequency and temperature dependence behavior of conductivity (ac and dc) and dielectric permittivity were studied. The results obtained describes the conduction mechanism in the system. Electric modulus formalism was performed to investigate the relaxation behavior which showed that as measuring temperature increases, the relaxation frequency increases whereas relaxation time decreases. This behavior explains the hopping mechanism of the charge carriers in the system. Likewise, the correlated barrier hopping model elucidates the dominant hopping mechanism.

Keywords

LiHf2(PO4)3 ceramics NASICON structure Conductivity Dielectric relaxation properties 
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Notes

Acknowledgements

The authors gratefully acknowledge the Department of Physics, Faculty of Science, Universiti Putra Malaysia (UPM) for the facilities provided.

Funding information

This research work was supported financially by the Fundamental Research Grant Scheme (FRGS) Project No. 01-02-14-1599FR.

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Copyright information

© Australian Ceramic Society 2017

Authors and Affiliations

  1. 1.Department of Physics, Faculty of ScienceUniversiti Putra MalaysiaSerdangMalaysia
  2. 2.Institute of Advanced Technology (ITMA)Universiti Putra MalaysiaSerdangMalaysia
  3. 3.Department of Physics, Faculty of ScienceAhmadu Bello University ZariaKadunaNigeria

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