caa a22 4500 463187806 CHVBK 20180406164859.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10973-006-8078-0 doi (NATIONALLICENCE)springer-10.1007/s10973-006-8078-0 Partialthermal reduction of ammonium paratungstate tetrahydrate [Elektronische Daten] Evolved gas analysis (TG/DTA-MS) and solid state studies (XRD,FTIR) [I. Szilágyi, J. Madarász, F. Hange, G. Pokol] Thermal decomposition of ammonium paratungstate tetrahydrate, (NH4)10[H2W12O42]·4H2O has been followed by simultaneous TG/DTA and online evolved gas analysis (TG/DTA-MS) in flowing 10% H2/Ar directly up to 900°C. Solid intermediate products have been structurally evaluated by FTIR spectroscopy and powder X-ray diffraction (XRD). A previously unexplained exothermic heat effect has been detected at 700-750°C. On the basis of TG/DTA as well as H2O and NH3 evolution curves and XRD patterns, it has been assigned to the formation and crystallization heat of γ-tungsten-oxide (WO2.72/W18O49) from β-tungsten-oxide (WO2.9/W20O58) and residual ammonium tungsten bronze. Springer-Verlag, 2007 FTIR spectroscopy nationallicence mass spectrometry nationallicence simultaneous TG/DTA nationallicence tungsten nationallicence X-ray diffraction nationallicence Szilágyi I. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut Madarász J. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut Hange F. GE Hungary ZRt., GE Consumer & Industrial - Lighting, Váci út 77, 1340, Budapest, Hungary aut Pokol G. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 88/1(2007-04-01), 139-144 1388-6150 88:1<139 2007 88 10973 https://doi.org/10.1007/s10973-006-8078-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-8078-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Szilágyi I. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut NATIONALLICENCE 700 1- Madarász J. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut NATIONALLICENCE 700 1- Hange F. GE Hungary ZRt., GE Consumer & Industrial - Lighting, Váci út 77, 1340, Budapest, Hungary aut NATIONALLICENCE 700 1- Pokol G. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111, Budapest, Hungary aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 88/1(2007-04-01), 139-144 1388-6150 88:1<139 2007 88 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer