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|Title:||Raman and X-ray photoelectron spectroscopic studies of lithium phosphotungstate glasses|
|Authors:||Chowdari, B.V.R. |
|Source:||Chowdari, B.V.R.,Tan, K.L.,Chia, W.T. (1992-07). Raman and X-ray photoelectron spectroscopic studies of lithium phosphotungstate glasses. Solid State Ionics 53-56 (PART 2) : 1172-1178. ScholarBank@NUS Repository.|
|Abstract:||Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) are used to investigate the 0.5 Li2O:0.5[(1-x)P2O5:xWO3] glassy system. Raman spectroscopy shows that besides the expected metaphosphate tetrahedra and tungstate tetrahedra, pyrophosphate tetrahedra and tungstate octahedra are also present. A reaction in the glass melt is proposed: 2 LiPO3+2 Li2WO4⇌Li4P2O7 +Li2W2O7. The proportions of the various structural groupings are determine d from the associated Raman peak areas. Structural groupings characteristic of the highly conducting Li4P2O7 and Li2W2O7 phases are the most abundant at around x=0.6. This offers a plausible explanation for the conductivity maximum previously observed near this composition. From the XPS spectra, binding energies of the Li 1s, P 2p, W 4f and O 1s core-levels are determined. The O 1s spectrum is found to consist of two peaks which are attributed to the P=O, P-O-P, P-O, W-O-W and W-O oxygen species. The proportion of the P-O-P species decreases as x increases. Good agreement is found between the XPS data and the Raman data. © 1992.|
|Source Title:||Solid State Ionics|
|Appears in Collections:||Staff Publications|
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