View in EDS

Structural studies of AgPO3 –MoO3 glasses using solid state NMR and vibrational spectroscopies

Saved in:
Bibliographic Details
Title: Structural studies of AgPO3 –MoO3 glasses using solid state NMR and vibrational spectroscopies
Authors: Santagneli, Silvia H.1, Ren, Jinjun2, Rinke, Matthias T.2, Ribeiro, Sidney J.L.1, Messaddeq, Younes1,3 younes.messaddeq@copl.ulaval.ca, Eckert, Hellmut2 eckerth@uni-muenster.de
Source: Journal of Non-Crystalline Solids. Apr2012, Vol. 358 Issue 6/7, p985-992. 8p.
Subjects: Metallic glasses, Chemical structure, Clustering of particles, Vibrational spectra, Nuclear magnetic resonance, Differential scanning calorimetry, Solid state chemistry
Abstract: Abstract: Vitreous samples (1-x) AgPO3–x MoO3 (0≤ x ≤0.5) were prepared by conventional melt-quenching and characterized by Differential Scanning Calorimetry (DSC). The structural evolution of the vitreous network was monitored by 31P solid state nuclear magnetic resonance and Raman scattering, and assignments were aided by corresponding studies on the model compound AgMoO2PO4. The 31P MAS-NMR data differentiate between species having two, one, and zero P―O―P linkages (Q(2) Q(1), and Q(0) species), respectively. Interatomic connectivities involving these units are revealed by two-dimensional INADEQUATE data, utilizing the formation of double quantum coherences mediated by indirect 31P–31P spin–spin interactions via P―O―P linkages. As this method discriminates against isolated P atoms, it also serves as an important spectral editing tool for constraining lineshape fits. 95Mo NMR data and Raman spectra suggest that the Mo species are most likely six-coordinate, forming four P―O―Mo linkages and are otherwise invariant with composition, except at MoO3 contents≥40 mole %, where some Mo―O―Mo bonding and/or clustering is observed. [Copyright &y& Elsevier]
Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Abstract: Vitreous samples (1-x) AgPO3–x MoO3 (0≤ x ≤0.5) were prepared by conventional melt-quenching and characterized by Differential Scanning Calorimetry (DSC). The structural evolution of the vitreous network was monitored by 31P solid state nuclear magnetic resonance and Raman scattering, and assignments were aided by corresponding studies on the model compound AgMoO2PO4. The 31P MAS-NMR data differentiate between species having two, one, and zero P―O―P linkages (Q(2) Q(1), and Q(0) species), respectively. Interatomic connectivities involving these units are revealed by two-dimensional INADEQUATE data, utilizing the formation of double quantum coherences mediated by indirect 31P–31P spin–spin interactions via P―O―P linkages. As this method discriminates against isolated P atoms, it also serves as an important spectral editing tool for constraining lineshape fits. 95Mo NMR data and Raman spectra suggest that the Mo species are most likely six-coordinate, forming four P―O―Mo linkages and are otherwise invariant with composition, except at MoO3 contents≥40 mole %, where some Mo―O―Mo bonding and/or clustering is observed. [Copyright &y& Elsevier]
ISSN:00223093
DOI:10.1016/j.jnoncrysol.2012.01.031