Abstract
Through a combination of 1H MAS NMR, 1H → 29Si → 1H double cross-polarization (CP) MAS NMR and 27Al → 1H CP MAS NMR, different OH species [SiOH, AlOH, and (Ca,Mg)OH (free OH)] have been unambiguously identified for hydrous Ca,Mg-(alumino)silicate glasses. This confirms my earlier speciation assignments made partially on the basis of 1H chemical shift arguments. The dissolution mechanisms of water in both Al-free silicate and aluminosilicate glasses (quenched melts) are fundamentally similar. For relatively polymerized compositions, it involves dominantly the formation of TOH species (T: Si, Al) through the rupture of T-O-T linkages, in addition to molecular H2O; for more depolymerized compositions containing network-modifying cations of large field strength (e.g., Ca, Mg), free OH species are also important.
| Original language | English |
|---|---|
| Pages (from-to) | 395-398 |
| Number of pages | 4 |
| Journal | American Mineralogist |
| Volume | 94 |
| Issue number | 2-3 |
| DOIs | |
| Publication status | Published - Feb 2009 |
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Keywords
- Aluminosilicate
- Glass
- Melt
- NMR
- Silicate
- Structure
- Water speciation
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Water speciation in hydrous silicate and aluminosilicate glasses : Direct evidence from 29si-1h and 27al-1h double-resonance NMR. / Xue, Xianyu.
In: American Mineralogist, Vol. 94, No. 2-3, 02.2009, p. 395-398.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Water speciation in hydrous silicate and aluminosilicate glasses
T2 - Direct evidence from 29si-1h and 27al-1h double-resonance NMR
AU - Xue, Xianyu
PY - 2009/2
Y1 - 2009/2
N2 - Through a combination of 1H MAS NMR, 1H → 29Si → 1H double cross-polarization (CP) MAS NMR and 27Al → 1H CP MAS NMR, different OH species [SiOH, AlOH, and (Ca,Mg)OH (free OH)] have been unambiguously identified for hydrous Ca,Mg-(alumino)silicate glasses. This confirms my earlier speciation assignments made partially on the basis of 1H chemical shift arguments. The dissolution mechanisms of water in both Al-free silicate and aluminosilicate glasses (quenched melts) are fundamentally similar. For relatively polymerized compositions, it involves dominantly the formation of TOH species (T: Si, Al) through the rupture of T-O-T linkages, in addition to molecular H2O; for more depolymerized compositions containing network-modifying cations of large field strength (e.g., Ca, Mg), free OH species are also important.
AB - Through a combination of 1H MAS NMR, 1H → 29Si → 1H double cross-polarization (CP) MAS NMR and 27Al → 1H CP MAS NMR, different OH species [SiOH, AlOH, and (Ca,Mg)OH (free OH)] have been unambiguously identified for hydrous Ca,Mg-(alumino)silicate glasses. This confirms my earlier speciation assignments made partially on the basis of 1H chemical shift arguments. The dissolution mechanisms of water in both Al-free silicate and aluminosilicate glasses (quenched melts) are fundamentally similar. For relatively polymerized compositions, it involves dominantly the formation of TOH species (T: Si, Al) through the rupture of T-O-T linkages, in addition to molecular H2O; for more depolymerized compositions containing network-modifying cations of large field strength (e.g., Ca, Mg), free OH species are also important.
KW - Aluminosilicate
KW - Glass
KW - Melt
KW - NMR
KW - Silicate
KW - Structure
KW - Water speciation
UR - http://www.scopus.com/inward/record.url?scp=67649964545&partnerID=8YFLogxK
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U2 - 10.2138/am.2009.3088
DO - 10.2138/am.2009.3088
M3 - Article
VL - 94
SP - 395
EP - 398
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 2-3
ER -