Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates
Abstract Gd3+-doped lead molybdato-tungstates with the chemical formula of Pb1−3x □ x Gd2x (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...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2020-03-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40145-020-0366-9 |
| _version_ | 1827834842910294016 |
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| author | T. Groń M. Maciejkowicz E. Tomaszewicz M. Guzik M. Oboz B. Sawicki S. Pawlus A. Nowok Z. Kukuła |
| author_facet | T. Groń M. Maciejkowicz E. Tomaszewicz M. Guzik M. Oboz B. Sawicki S. Pawlus A. Nowok Z. Kukuła |
| author_sort | T. Groń |
| collection | DOAJ |
| description | Abstract Gd3+-doped lead molybdato-tungstates with the chemical formula of Pb1−3x □ x Gd2x (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 (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. |
| first_indexed | 2024-03-12T05:57:49Z |
| format | Article |
| id | doaj.art-a8a3a0db1d4545a4b53e8fefaaa46b19 |
| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-12T05:57:49Z |
| publishDate | 2020-03-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-a8a3a0db1d4545a4b53e8fefaaa46b192023-09-03T04:25:17ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082020-03-019225526810.1007/s40145-020-0366-9Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstatesT. Groń0M. Maciejkowicz1E. Tomaszewicz2M. Guzik3M. Oboz4B. Sawicki5S. Pawlus6A. Nowok7Z. Kukuła8Institute of Physics, University of SilesiaFaculty of Chemical Technology and Engineering, Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology in SzczecinFaculty of Chemical Technology and Engineering, Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology in SzczecinFaculty of Chemistry, University of WrocławInstitute of Physics, University of SilesiaInstitute of Physics, University of SilesiaInstitute of Physics, University of SilesiaInstitute of Physics, University of SilesiaInstitute of Physics, University of SilesiaAbstract Gd3+-doped lead molybdato-tungstates with the chemical formula of Pb1−3x □ x Gd2x (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 (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.https://doi.org/10.1007/s40145-020-0366-9scheeliteGd3+-substituted PbMoO4combustionsolid solutionmagnetic propertiesdielectric properties |
| spellingShingle | T. Groń M. Maciejkowicz E. Tomaszewicz M. Guzik M. Oboz B. Sawicki S. Pawlus A. Nowok Z. Kukuła Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates Journal of Advanced Ceramics scheelite Gd3+-substituted PbMoO4 combustion solid solution magnetic properties dielectric properties |
| title | Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates |
| title_full | Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates |
| title_fullStr | Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates |
| title_full_unstemmed | Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates |
| title_short | Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates |
| title_sort | combustion synthesis structural magnetic and dielectric properties of gd3 doped lead molybdato tungstates |
| topic | scheelite Gd3+-substituted PbMoO4 combustion solid solution magnetic properties dielectric properties |
| url | https://doi.org/10.1007/s40145-020-0366-9 |
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