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Research Article | Open Access

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

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
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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

scheeliteGd3+-substituted PbMoO4combustionsolid solutionmagnetic propertiesdielectric properties

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Journal of Advanced Ceramics
Volume 9 Issue 2,
April 2020
Pages 255-268
DOI: 10.1007/s40145-020-0366-9
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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Received: 28 October 2019
Revised: 24 January 2020
Accepted: 09 February 2020
Published: 23 March 2020
© The author(s) 2020

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