Abstract
Photon correlation spectroscopy conducted on polymeric metaphosphate melts [NaPO3]1-y[Zn(PO3)2]y shows a systematic decrease in glass fragility as the more strongly bonding Zn cation replaces the more weakly bonding Na cation as a crosslinking agent between PO3 chains. This decrease is similar to that observed previously in Na-Al melts and the decrease in fragility for both systems is shown to be fully consistent with a recently reported universal pattern of fragility in network forming glasses as a function of network connectivity. Unique to the Na-Zn system is the appearance of an ultraslow relaxation in the dynamic structure factor (slower than the viscoelastic decay) that is not present in either Na-Al or Na-Li metaphosphate mixtures. This relaxation appears to originate from the diffusion of the Zn cation within the melt which is partially coupled to the oxide network. Taken together, these results underscore the need to distinguish between network-forming cations of high ionic bond strength that contribute to the connectivity of the oxide network and those of lower bond strength that do not contribute.
| Original language | English (US) |
|---|---|
| Article number | 164503 |
| Journal | Journal of Chemical Physics |
| Volume | 145 |
| Issue number | 16 |
| DOIs | |
| State | Published - Oct 28 2016 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
Cite this
Assessing the network connectivity of modifier ions in metaphosphate glass melts : A dynamic light scattering study of Na-Zn mixtures. / Sidebottom, David L.; Vu, D.
In: Journal of Chemical Physics, Vol. 145, No. 16, 164503, 28.10.2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Assessing the network connectivity of modifier ions in metaphosphate glass melts
T2 - A dynamic light scattering study of Na-Zn mixtures
AU - Sidebottom, David L.
AU - Vu, D.
PY - 2016/10/28
Y1 - 2016/10/28
N2 - Photon correlation spectroscopy conducted on polymeric metaphosphate melts [NaPO3]1-y[Zn(PO3)2]y shows a systematic decrease in glass fragility as the more strongly bonding Zn cation replaces the more weakly bonding Na cation as a crosslinking agent between PO3 chains. This decrease is similar to that observed previously in Na-Al melts and the decrease in fragility for both systems is shown to be fully consistent with a recently reported universal pattern of fragility in network forming glasses as a function of network connectivity. Unique to the Na-Zn system is the appearance of an ultraslow relaxation in the dynamic structure factor (slower than the viscoelastic decay) that is not present in either Na-Al or Na-Li metaphosphate mixtures. This relaxation appears to originate from the diffusion of the Zn cation within the melt which is partially coupled to the oxide network. Taken together, these results underscore the need to distinguish between network-forming cations of high ionic bond strength that contribute to the connectivity of the oxide network and those of lower bond strength that do not contribute.
AB - Photon correlation spectroscopy conducted on polymeric metaphosphate melts [NaPO3]1-y[Zn(PO3)2]y shows a systematic decrease in glass fragility as the more strongly bonding Zn cation replaces the more weakly bonding Na cation as a crosslinking agent between PO3 chains. This decrease is similar to that observed previously in Na-Al melts and the decrease in fragility for both systems is shown to be fully consistent with a recently reported universal pattern of fragility in network forming glasses as a function of network connectivity. Unique to the Na-Zn system is the appearance of an ultraslow relaxation in the dynamic structure factor (slower than the viscoelastic decay) that is not present in either Na-Al or Na-Li metaphosphate mixtures. This relaxation appears to originate from the diffusion of the Zn cation within the melt which is partially coupled to the oxide network. Taken together, these results underscore the need to distinguish between network-forming cations of high ionic bond strength that contribute to the connectivity of the oxide network and those of lower bond strength that do not contribute.
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U2 - 10.1063/1.4965815
DO - 10.1063/1.4965815
M3 - Article
VL - 145
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 16
M1 - 164503
ER -