Amongst the investigated salts of tungstophosphoric acid (WPA), special attention has been paid to barium salt of WPA (BaHWPA), because of its different behavior in comparison with other WPA salts. In order to complete the characterization of this salt we performed IR, Raman and photoluminescent spectroscopy as well as conductivity measurements. The obtained spectra were compared with the spectra of other large-strong cation salts. A very wide photoluminescent spectrum of the investigated compound in the visible range, with an emission maximum at 630 nm was recorded. There are some indications that this photoluminescence effect arose from a phase transformation at about 60°C, caused by the reversible reduction of tungsten ion (W 6+ + e ⇔ W 5+ ). This phase transformation of BaHWPA has already been observed in previous dielectric studies. Specific structural characteristics of BaHWPA affect the mechanism of proton conductivity.
Keywords:
Barium salt of 12-tungstophosphoric acid / Conductivity of solids / IR / Partial reduction / Photoluminescence spectra / Raman spectra / Structural modification
Source:
Current Research in Advanced Materials and Processes, 2002, 413, 135-140
TY - CONF
AU - Bošnjaković, N
AU - Uskoković-Marković, Snežana
AU - Mioč, Ubavka B.
PY - 2002
UR - https://farfar.pharmacy.bg.ac.rs/handle/123456789/398
AB - Amongst the investigated salts of tungstophosphoric acid (WPA), special attention has been paid to barium salt of WPA (BaHWPA), because of its different behavior in comparison with other WPA salts. In order to complete the characterization of this salt we performed IR, Raman and photoluminescent spectroscopy as well as conductivity measurements. The obtained spectra were compared with the spectra of other large-strong cation salts. A very wide photoluminescent spectrum of the investigated compound in the visible range, with an emission maximum at 630 nm was recorded. There are some indications that this photoluminescence effect arose from a phase transformation at about 60°C, caused by the reversible reduction of tungsten ion (W 6+ + e ⇔ W 5+ ). This phase transformation of BaHWPA has already been observed in previous dielectric studies. Specific structural characteristics of BaHWPA affect the mechanism of proton conductivity.
PB - Trans Tech Publications Ltd
C3 - Current Research in Advanced Materials and Processes
T1 - Characterization of the barium salt of 12-tungstophosphoric acid by spectroscopic methods
VL - 413
SP - 135
EP - 140
UR - https://hdl.handle.net/21.15107/rcub_farfar_398
ER -
@conference{
author = "Bošnjaković, N and Uskoković-Marković, Snežana and Mioč, Ubavka B.",
year = "2002",
abstract = "Amongst the investigated salts of tungstophosphoric acid (WPA), special attention has been paid to barium salt of WPA (BaHWPA), because of its different behavior in comparison with other WPA salts. In order to complete the characterization of this salt we performed IR, Raman and photoluminescent spectroscopy as well as conductivity measurements. The obtained spectra were compared with the spectra of other large-strong cation salts. A very wide photoluminescent spectrum of the investigated compound in the visible range, with an emission maximum at 630 nm was recorded. There are some indications that this photoluminescence effect arose from a phase transformation at about 60°C, caused by the reversible reduction of tungsten ion (W 6+ + e ⇔ W 5+ ). This phase transformation of BaHWPA has already been observed in previous dielectric studies. Specific structural characteristics of BaHWPA affect the mechanism of proton conductivity.",
publisher = "Trans Tech Publications Ltd",
journal = "Current Research in Advanced Materials and Processes",
title = "Characterization of the barium salt of 12-tungstophosphoric acid by spectroscopic methods",
volume = "413",
pages = "135-140",
url = "https://hdl.handle.net/21.15107/rcub_farfar_398"
}
Bošnjaković, N., Uskoković-Marković, S.,& Mioč, U. B.. (2002). Characterization of the barium salt of 12-tungstophosphoric acid by spectroscopic methods. in Current Research in Advanced Materials and Processes
Trans Tech Publications Ltd., 413, 135-140.
https://hdl.handle.net/21.15107/rcub_farfar_398
Bošnjaković N, Uskoković-Marković S, Mioč UB. Characterization of the barium salt of 12-tungstophosphoric acid by spectroscopic methods. in Current Research in Advanced Materials and Processes. 2002;413:135-140.
https://hdl.handle.net/21.15107/rcub_farfar_398 .
Bošnjaković, N, Uskoković-Marković, Snežana, Mioč, Ubavka B., "Characterization of the barium salt of 12-tungstophosphoric acid by spectroscopic methods" in Current Research in Advanced Materials and Processes, 413 (2002):135-140,
https://hdl.handle.net/21.15107/rcub_farfar_398 .
