Glasses in the system NaAlSiO4-KAlSiO4-SiO2: preliminary study of structural characteristics using 29Si MAS NMR spectroscopy

M. Coltorti

Glasses in the system NaAlSiO4-KAlSiO4-SiO2: preliminary study of structural characteristics using 29Si MAS NMR spectroscopy

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Abstract

Nuclear Magnetic Resonance analyses on nuclei of ²⁹Si on glasses of the series NaAlSi₂O₆ - KAlSi₂O₆ (Jd-Leuc) and NaAlSi₃ O₈ - KAlSi₃O₈ (Ab-Or) have been carried out. The chemical shift δ ranges between -93 and -94.2 ppm for the join Jd-Leuc, while it varies between -97.8 and -98.7 ppm for the join Ab-Or. The chemical shift decreases, increasing the Si/Al and the K/Na ratios of the liquid. The presence of different Q⁴ (mAl) units, their different statistical distribution, or change in the bond angle could be responsible for the observed δ variations. Moreover the spectra of the glasses of the series Jd-Leuc suggest that Al in jadeitic glasses enters tetrahedral coordination instead of octahedral, as for the Jadeite crystals. -Author

Original language	English
Pages (from-to)	789-794
Number of pages	6
Journal	Rendiconti - Societa Italiana di Mineralogia e Petrologia
Volume	43
Issue number	3
Publication status	Published - 1988
Externally published	Yes

Cite this

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title = "Glasses in the system NaAlSiO4-KAlSiO4-SiO2: preliminary study of structural characteristics using 29Si MAS NMR spectroscopy",

abstract = "Nuclear Magnetic Resonance analyses on nuclei of 29Si on glasses of the series NaAlSi2O6 - KAlSi2O6 (Jd-Leuc) and NaAlSi3 O8 - KAlSi3O8 (Ab-Or) have been carried out. The chemical shift δ ranges between -93 and -94.2 ppm for the join Jd-Leuc, while it varies between -97.8 and -98.7 ppm for the join Ab-Or. The chemical shift decreases, increasing the Si/Al and the K/Na ratios of the liquid. The presence of different Q4 (mAl) units, their different statistical distribution, or change in the bond angle could be responsible for the observed δ variations. Moreover the spectra of the glasses of the series Jd-Leuc suggest that Al in jadeitic glasses enters tetrahedral coordination instead of octahedral, as for the Jadeite crystals. -Author",

author = "M. Coltorti",

year = "1988",

language = "English",

volume = "43",

pages = "789--794",

journal = "Rendiconti - Societa Italiana di Mineralogia e Petrologia",

publisher = "Societa italiana di mineralogia e petrologia",

number = "3",

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TY - JOUR

T1 - Glasses in the system NaAlSiO4-KAlSiO4-SiO2

T2 - preliminary study of structural characteristics using 29Si MAS NMR spectroscopy

AU - Coltorti, M.

PY - 1988

Y1 - 1988

N2 - Nuclear Magnetic Resonance analyses on nuclei of 29Si on glasses of the series NaAlSi2O6 - KAlSi2O6 (Jd-Leuc) and NaAlSi3 O8 - KAlSi3O8 (Ab-Or) have been carried out. The chemical shift δ ranges between -93 and -94.2 ppm for the join Jd-Leuc, while it varies between -97.8 and -98.7 ppm for the join Ab-Or. The chemical shift decreases, increasing the Si/Al and the K/Na ratios of the liquid. The presence of different Q4 (mAl) units, their different statistical distribution, or change in the bond angle could be responsible for the observed δ variations. Moreover the spectra of the glasses of the series Jd-Leuc suggest that Al in jadeitic glasses enters tetrahedral coordination instead of octahedral, as for the Jadeite crystals. -Author

AB - Nuclear Magnetic Resonance analyses on nuclei of 29Si on glasses of the series NaAlSi2O6 - KAlSi2O6 (Jd-Leuc) and NaAlSi3 O8 - KAlSi3O8 (Ab-Or) have been carried out. The chemical shift δ ranges between -93 and -94.2 ppm for the join Jd-Leuc, while it varies between -97.8 and -98.7 ppm for the join Ab-Or. The chemical shift decreases, increasing the Si/Al and the K/Na ratios of the liquid. The presence of different Q4 (mAl) units, their different statistical distribution, or change in the bond angle could be responsible for the observed δ variations. Moreover the spectra of the glasses of the series Jd-Leuc suggest that Al in jadeitic glasses enters tetrahedral coordination instead of octahedral, as for the Jadeite crystals. -Author

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M3 - Article

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VL - 43

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JO - Rendiconti - Societa Italiana di Mineralogia e Petrologia

JF - Rendiconti - Societa Italiana di Mineralogia e Petrologia

IS - 3

ER -

Glasses in the system NaAlSiO4-KAlSiO4-SiO2: preliminary study of structural characteristics using 29Si MAS NMR spectroscopy

Abstract

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