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Journal of Advanced Ceramics 2020, 9(2): 255-268 https://doi.org/10.1007/s40145-020-0366-9
Research Article | Open Access | Issue | Published: 23 March 2020

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato–tungstates

Show Author's Information T. GROŃa,  M. MACIEJKOWICZb,  E. TOMASZEWICZb( ),  M. GUZIKc,  M. OBOZa,  B. SAWICKIa,  S. PAWLUSa,  A. NOWOKa,  Z. KUKUŁAa
Institute of Physics, University of Silesia, 40-007 Katowice, Poland
Faculty of Chemical Technology and Engineering, Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology in Szczecin, Al. Piastów 42, 71-065 Szczecin, Poland
Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland
Keywords:
magnetic properties, dielectric properties, solid solution, scheelite, Gd3+-substituted PbMoO4, combustion
Cite this article:
GROŃ T, MACIEJKOWICZ M, TOMASZEWICZ E, et al. Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato–tungstates. Journal of Advanced Ceramics, 2020, 9(2): 255-268. https://doi.org/10.1007/s40145-020-0366-9
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Abstract Full text About this article

Gd3+-doped lead molybdato–tungstates with the chemical formula of Pb1–3xħxGd2x(MoO4)1–3x(WO4)3x (where x = 0.0455, 0.0839, 0.1430, corresponding to 9.53, 18.32, 33.37 mol% of Gd3+, respectively, as well as ħ denotes cationic vacancies) were successfully synthesized via combustion route. The XRD and SEM results confirmed the formation of single-phase, tetragonal scheelite-type materials (space group I41/a) with the uniform, spherical and oval grains ranging from 5 to 20 μm. Individual grains are strongly agglomerated into big clusters with the size even above 50 μm. The magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with characteristic superparamagnetic-like behaviour and the short-range ferromagnetic interactions. The electrical and broadband dielectric spectroscopy studies revealed insulating properties with the residual electrical n-type conduction of 2×10–9 S/m and low energy loss (tanδ ≈ 0.01) below 300 K. Dielectric analysis showed that no dipole relaxation processes in the Gd3+-doped materials were observed. A fit of dielectric loss spectra of Gd3+-doped samples by sum of the conductivity and the Havriliak–Negami, Cole–Cole, and Cole–Davidson functions confirmed this effect.


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About this article

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato–tungstates

Show Author's information T. GROŃa, M. MACIEJKOWICZb, E. TOMASZEWICZb( ), M. GUZIKc, M. OBOZa, B. SAWICKIa, S. PAWLUSa, A. NOWOKa, Z. KUKUŁAa
Institute of Physics, University of Silesia, 40-007 Katowice, Poland
Faculty of Chemical Technology and Engineering, Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology in Szczecin, Al. Piastów 42, 71-065 Szczecin, Poland
Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland

Abstract

Gd3+-doped lead molybdato–tungstates with the chemical formula of Pb1–3xħxGd2x(MoO4)1–3x(WO4)3x (where x = 0.0455, 0.0839, 0.1430, corresponding to 9.53, 18.32, 33.37 mol% of Gd3+, respectively, as well as ħ denotes cationic vacancies) were successfully synthesized via combustion route. The XRD and SEM results confirmed the formation of single-phase, tetragonal scheelite-type materials (space group I41/a) with the uniform, spherical and oval grains ranging from 5 to 20 μm. Individual grains are strongly agglomerated into big clusters with the size even above 50 μm. The magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with characteristic superparamagnetic-like behaviour and the short-range ferromagnetic interactions. The electrical and broadband dielectric spectroscopy studies revealed insulating properties with the residual electrical n-type conduction of 2×10–9 S/m and low energy loss (tanδ ≈ 0.01) below 300 K. Dielectric analysis showed that no dipole relaxation processes in the Gd3+-doped materials were observed. A fit of dielectric loss spectra of Gd3+-doped samples by sum of the conductivity and the Havriliak–Negami, Cole–Cole, and Cole–Davidson functions confirmed this effect.

Keywords: magnetic properties, dielectric properties, solid solution, scheelite, Gd3+-substituted PbMoO4, combustion

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Publication history
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Publication history

Received: 28 October 2019
Revised: 24 January 2020
Accepted: 09 February 2020
Published: 23 March 2020
Issue date: April 2020

Copyright

© The author(s) 2020

Acknowledgements

This work was partly supported by Ministry of Science and Higher Education (Poland) and funded from Science Resources: No. 1S-0300–500-1-05-06 and UPB-DZS 518-10-020-3101-01/18. One of us (M. Maciejkowicz) would like to thank for the financial support from National Science Center of Poland for the grant PRELUDIUM 14 No. UMO-2017/27/N/ST8/00741.

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