Details
| Original language | English |
|---|---|
| Pages (from-to) | 243-250 |
| Number of pages | 8 |
| Journal | European journal of mineralogy |
| Volume | 17 |
| Issue number | 2 |
| Publication status | Published - 29 Apr 2005 |
Abstract
A simplified thermodynamic model is proposed assuming nepheline-like and trydimite-like structural units being major constituents of polymerized aluminosilicate melts. In the frame of the model, dissolution of albite in the melt can be described by the dissociation reaction AbL = NeL + QzL. Static 23Na NMR spectra recorded on glasses along the binary join Ab-Qz are consistent with the proposed structural units. The NMR spectra can be decomposed into two mixed (Lorentzian + Gaussian) components. The narrow line is comparable in chemical shift and width with the symmetric position of sodium in crystalline nepheline. The second much broader line is assigned to a more asymmetric albite-like environment. The proportions of both sites estimated from static NMR of glasses of the dry Ab-Qz binary are close to the calculated proportion in the melt at the glass transition. Using the new thermodynamic model, the liquidus of silica polymorphs in the system Ab-Qz can be described well by assuming non-ideal mixing of structural units in the melt with small interaction parameters.
Keywords
- Na NMR spectroscopy, Aluminosilicate melts, Liquidus, Melting relations, Thermodynamics model
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: European journal of mineralogy, Vol. 17, No. 2, 29.04.2005, p. 243-250.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A thermodynamic model for polymerized sodium aluminosilicate melts
AU - Simakin, Alexander G.
AU - Zavel'sky, Vladimir O.
AU - Behrens, Harald
AU - Kucherinenko, Jaroslav
AU - Salova, Tamara
PY - 2005/4/29
Y1 - 2005/4/29
N2 - A simplified thermodynamic model is proposed assuming nepheline-like and trydimite-like structural units being major constituents of polymerized aluminosilicate melts. In the frame of the model, dissolution of albite in the melt can be described by the dissociation reaction AbL = NeL + QzL. Static 23Na NMR spectra recorded on glasses along the binary join Ab-Qz are consistent with the proposed structural units. The NMR spectra can be decomposed into two mixed (Lorentzian + Gaussian) components. The narrow line is comparable in chemical shift and width with the symmetric position of sodium in crystalline nepheline. The second much broader line is assigned to a more asymmetric albite-like environment. The proportions of both sites estimated from static NMR of glasses of the dry Ab-Qz binary are close to the calculated proportion in the melt at the glass transition. Using the new thermodynamic model, the liquidus of silica polymorphs in the system Ab-Qz can be described well by assuming non-ideal mixing of structural units in the melt with small interaction parameters.
AB - A simplified thermodynamic model is proposed assuming nepheline-like and trydimite-like structural units being major constituents of polymerized aluminosilicate melts. In the frame of the model, dissolution of albite in the melt can be described by the dissociation reaction AbL = NeL + QzL. Static 23Na NMR spectra recorded on glasses along the binary join Ab-Qz are consistent with the proposed structural units. The NMR spectra can be decomposed into two mixed (Lorentzian + Gaussian) components. The narrow line is comparable in chemical shift and width with the symmetric position of sodium in crystalline nepheline. The second much broader line is assigned to a more asymmetric albite-like environment. The proportions of both sites estimated from static NMR of glasses of the dry Ab-Qz binary are close to the calculated proportion in the melt at the glass transition. Using the new thermodynamic model, the liquidus of silica polymorphs in the system Ab-Qz can be described well by assuming non-ideal mixing of structural units in the melt with small interaction parameters.
KW - Na NMR spectroscopy
KW - Aluminosilicate melts
KW - Liquidus
KW - Melting relations
KW - Thermodynamics model
UR - http://www.scopus.com/inward/record.url?scp=18544379621&partnerID=8YFLogxK
U2 - 10.1127/0935-1221/2005/0017-0243
DO - 10.1127/0935-1221/2005/0017-0243
M3 - Article
AN - SCOPUS:18544379621
VL - 17
SP - 243
EP - 250
JO - European journal of mineralogy
JF - European journal of mineralogy
SN - 0935-1221
IS - 2
ER -