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Title: Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato–tungstates
Authors: Groń, Tadeusz
Maciejkowicz, M.
Tomaszewicz, E.
Guzik, M.
Oboz, Monika
Sawicki, Bogdan
Pawlus, Sebastian
Nowok, Andrzej
Kukuła, Zenon
Keywords: scheelite; Gd3+-substituted PbMoO4; combustion; solid solution; magnetic properties; dielectric properties
Issue Date: 2020
Citation: "Journal of Advanced Ceramics" Vol. 9, iss. 2 (2020), s. 255-268
Abstract: Gd3+-doped lead molybdato–tungstates with the chemical formula of Pb1–3x□xGd2x(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 □ 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 (tanς ~ 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.
DOI: 10.1007/s40145-020-0366-9
ISSN: 2226-4108
Appears in Collections:Artykuły (WNŚiT)

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