Temperature-dependent vibrational (Raman and infrared) spectroscopy and
X-ray diffraction studies have been performed on polycrystalline Na2WO4
center dot 2H(2)O and Na2MoO4 center dot 2H(2)O crystals. Raman data at
low temperature 13-300 K for sodium tungstate Na2WO4 center dot 2H(2)O
was compared with the sodium molybdate Na2MoO4 center dot 2H(2)O. The
infrared and the X-ray diffraction obtained in the 80-300 K suggest that
both crystals have undergone conformational changes connected with an
increase in the Raman intensity of NaO6 modes and the libration modes of
water molecules at about 100-120 K. Additionally, Raman spectroscopy
measurements of Na2WO4 center dot 2H(2)O under hydrostatic pressure
(from 0 to 5 GPa) were performed. The pressure-dependent studies
indicate the starting orthorhombic structure is stable in the 0.0-3.2
GPa pressure range, and undergoes a phase transition at about 3.9 GPa,
associated with rotation of WO4-2 units. (C) 2012 Elsevier B.V. All
rights reserved.
%0 Journal Article
%1 WOS:000312965800023
%A Saraiva, G D
%A Luz-Lima, C
%A Freire, P T C
%A de Castro, A J Ramiro
%A de Sousa, G P
%A Melo, F E A
%A Silva, J H
%A Filho, J Mendes
%C RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
%D 2013
%I ELSEVIER
%J JOURNAL OF MOLECULAR STRUCTURE
%K Infrared; Molybdate; Phase Tungstates; X-ray; transition} {Raman;
%P 154-161
%R 10.1016/j.molstruc.2012.08.024
%T Vibrational and structural properties in the dihydrate sodium tungstate
and in the dihydrate sodium molybdate crystals
%V 1033
%X Temperature-dependent vibrational (Raman and infrared) spectroscopy and
X-ray diffraction studies have been performed on polycrystalline Na2WO4
center dot 2H(2)O and Na2MoO4 center dot 2H(2)O crystals. Raman data at
low temperature 13-300 K for sodium tungstate Na2WO4 center dot 2H(2)O
was compared with the sodium molybdate Na2MoO4 center dot 2H(2)O. The
infrared and the X-ray diffraction obtained in the 80-300 K suggest that
both crystals have undergone conformational changes connected with an
increase in the Raman intensity of NaO6 modes and the libration modes of
water molecules at about 100-120 K. Additionally, Raman spectroscopy
measurements of Na2WO4 center dot 2H(2)O under hydrostatic pressure
(from 0 to 5 GPa) were performed. The pressure-dependent studies
indicate the starting orthorhombic structure is stable in the 0.0-3.2
GPa pressure range, and undergoes a phase transition at about 3.9 GPa,
associated with rotation of WO4-2 units. (C) 2012 Elsevier B.V. All
rights reserved.
@article{WOS:000312965800023,
abstract = {Temperature-dependent vibrational (Raman and infrared) spectroscopy and
X-ray diffraction studies have been performed on polycrystalline Na2WO4
center dot 2H(2)O and Na2MoO4 center dot 2H(2)O crystals. Raman data at
low temperature 13-300 K for sodium tungstate Na2WO4 center dot 2H(2)O
was compared with the sodium molybdate Na2MoO4 center dot 2H(2)O. The
infrared and the X-ray diffraction obtained in the 80-300 K suggest that
both crystals have undergone conformational changes connected with an
increase in the Raman intensity of NaO6 modes and the libration modes of
water molecules at about 100-120 K. Additionally, Raman spectroscopy
measurements of Na2WO4 center dot 2H(2)O under hydrostatic pressure
(from 0 to 5 GPa) were performed. The pressure-dependent studies
indicate the starting orthorhombic structure is stable in the 0.0-3.2
GPa pressure range, and undergoes a phase transition at about 3.9 GPa,
associated with rotation of WO4-2 units. (C) 2012 Elsevier B.V. All
rights reserved.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS},
author = {Saraiva, G D and Luz-Lima, C and Freire, P T C and de Castro, A J Ramiro and de Sousa, G P and Melo, F E A and Silva, J H and Filho, J Mendes},
biburl = {https://www.bibsonomy.org/bibtex/26d3e9df0ce31d2f9000b6f9c9e0c078f/ppgfis_ufc_br},
doi = {10.1016/j.molstruc.2012.08.024},
interhash = {d50c117bf67bf5b38931d21c21f7a27f},
intrahash = {6d3e9df0ce31d2f9000b6f9c9e0c078f},
issn = {0022-2860},
journal = {JOURNAL OF MOLECULAR STRUCTURE},
keywords = {Infrared; Molybdate; Phase Tungstates; X-ray; transition} {Raman;},
pages = {154-161},
publisher = {ELSEVIER},
pubstate = {published},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {Vibrational and structural properties in the dihydrate sodium tungstate
and in the dihydrate sodium molybdate crystals},
tppubtype = {article},
volume = 1033,
year = 2013
}