A theoretical interpretation of the chemical shift of 29Si NMR peaks in alkali borosilicate glasses
β Scribed by Tokuro Nanba; Mitsunori Nishimura; Yoshinari Miura
- Book ID
- 116501374
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 489 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-7037
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A new approach to the analysis oftbe U-shaped dependence of \*%i NMR chemical shifts on the sum ofgroup electronegativities of ligands, based on a proper account of the presence of the silicon core A0 of the same symmetry as the silicon valence 3p A0 is presented. A new dependence between I,,= ( T-'
The "!%I MAS NMR spxu-um or dehydrawd CaY zeobm IS comphcared wilh re\_~pec~ LO the h>drakd SKILS .md show\_+ ~1 leasr IWO extra hncs. The spectrum can be ralionahzed by assuming each 01 the lour Si( JIAI) Imes LO be sp11~ IIIICI 1-o Iins nith a chemical shah difrerence of 8 8 ppm and XI inlensiIy r