Alkali metal impact on structural and phonon properties of Er3+ and Tm3+ co-doped MY(WO4)2 (M ¼ Li, Na, K) nanocrystals

Paulina Ropuszyńska-Robak , Paweł Edward Tomaszewski , L. Kępiński , Lucyna Macalik

Abstract

The Pechini and microwave-assisted hydrothermal syntheses of nanocrystalline Er3+ and Tm3+ co-doped MY(WO4)2, where M ¼ Li, Na, K, double tungstates are reported. The obtained samples were characterized using standard X-ray powder diffraction (XRD) technique, Rietveld method, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and IR spectroscopy. The smallest crystallites (about 13 nm) could be obtained for the sodium samples synthesized by both the Pechini (for the resin calcined at 550 C) and hydrothermal methods (synthesis at 230 C). The average particle size of nanocrystalline powders increases with increasing temperature. It was found that nanocrystals retain the bulk structure with tetragonal and monoclinic symmetry for the sodium and potassium analogues, respectively. In contrast to this behaviour, LiY(WO4)2 undergoes a size-induced structural transformation from monoclinic (space group P2/n) to tetragonal (space group I41/a) symmetry. IR spectra of the synthesized sodium and potassium compounds are very similar to their bulk counterparts. IR spectra of the lithium analogues show, however, abrupt changes when the calcination temperature increases to 850 C or higher. This behaviour is consistent with the size-induced phase transition in this compound.
Author Paulina Ropuszyńska-Robak (EaE / IChaFT / DBCh)
Paulina Ropuszyńska-Robak,,
- Department of Bioorganic Chemistry
, Paweł Edward Tomaszewski
Paweł Edward Tomaszewski,,
-
, L. Kępiński
L. Kępiński,,
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, Lucyna Macalik - Institute of Low Temperatures and Structure Research Polish Academy of Sciences (INTiBS PAN) [Polish Academy of Sciences (PAN)]
Lucyna Macalik,,
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Journal seriesRSC Advances, ISSN 2046-2069, (A 35 pkt)
Issue year2018
No8
Pages2632-2641
Publication size in sheets0.5
ASJC Classification1500 General Chemical Engineering; 1600 General Chemistry
DOIDOI:10.1039/c7ra10706d
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
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Ropuszynska_Robak_Tomaszewski_Kepinski_Macalik_Alkali_Metal_Impact.pdf 2,16 MB
Score (nominal)35
Score sourcejournalList
Publication indicators WoS Citations = 2; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.736; WoS Impact Factor: 2018 = 3.049 (2) - 2018=3.168 (5)
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