Preparation and structure of organic-inorganic hybrid low-melting phosphite glasses from phosphonic acid H3PO3

2003 ◽  
Vol 18 (5) ◽  
pp. 1081-1086 ◽  
Author(s):  
Haruki Niida ◽  
Masahide Takahashi ◽  
Takashi Uchino ◽  
Toshinobu Yoko
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Phosphonic Acid ◽  
Acid Base ◽  
Inorganic Hybrid ◽  
Average Linkage ◽  
Nuclear Magnetic Resonance Spectra ◽  
Si Content

An organic–inorganic, hybrid, low-melting glass free of pollution elements such as Pb and F was prepared through nonaqueous acid-base reactions of Si—Cl + P—OH ⇉ Si—O—P + HCl⇈ and Sn—Cl + P—OH ⇉ Sn—O—P + HCl⇈ using phosphonic acid (H3PO3), dimethyldichlorosilane (Me2SiCl2), and tin(II)chloride (SnCl2) as starting materials. Transparent, colorless, and homogeneous phosphite glass was successfully obtained. The formation of P—O—Si linkage and the disappearance of P—OH were confirmed by 31P nuclear magnetic resonance spectra. With increasing Si content, the glass-transition temperature decreased, reflecting the decrease of the average linkage number per one cation.

scholarly journals Polymer Electrolytes with Exclusively Cationic Conductivity

1988 ◽  
Vol 135 ◽  
Author(s):  
H. Liu ◽  
Y. Okamoto ◽  
T. Skotheim ◽  
Y. S. Pak ◽  
S. G. Greenbaum ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Hydrostatic Pressure ◽  
Magnetic Resonance ◽  
Polymer Electrolytes ◽  
Ion Pair ◽  
Pair Formation ◽  
Motional Narrowing

AbstractThe synthesis of exclusively cation conducting polymer electrolytes based on a nylon-l backbone, ethylene-oxide side chains, and attached dibutyl phenolate anions is described. The tendency for ion pair formation appears to be reduced as the conductivity of the sodium-containing compound reaches −2 × 10−6 S-cm−1 at 50°C. 23Na nuclear magnetic resonance measurements demonstrate: i) motional narrowing of the mobile Na+ resonance above the glass transition temperature; ii) mobile Na+ concentrations of ∼75% at 40°C; iii) insensitivity of the linewidth to applied hydrostatic pressure up to 2 kbar. Similaries between these findings, and those in “conventional” polymer-salt electrolytes are discussed.

Energetics of oxidation of RE–Si–Al–O–N glasses

2003 ◽  
Vol 18 (7) ◽  
pp. 1607-1613 ◽  
Author(s):  
Yahong Zhang ◽  
Alexandra Navrotsky ◽  
Dirk Matusch ◽  
Hans Jürgen Seifert
Keyword(s):  
Glass Transition ◽  
Rare Earth ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Nitrogen Content ◽  
Ionic Radius ◽  
Composition Range ◽  
Enthalpies Of Formation ◽  
Acid Base ◽  
Nitrogen Ions

Enthalpies of drop solution in molten 52 wt.% LiBO2-48 wt.% NaBO2 at 1078 K were measured for RE1.1Si1.7Al0.6O6-1.5xNx (x = 0, 0.2, 0.4, 0.6, 0.8) glasses for RE = Nd, Gd, Dy, Er, and Y. Linear relations between enthalpies of formation from elements and nitrogen content indicate that, within the experimental composition range, sites occupied by nitrogen ions are approximately equivalent in energy for a given substitutional series. The energetics of different rare-earth SiAlON glasses appears to be dominated by differences in the acid/base character of the cations. The onset glass-transition temperature increases linearly with increasing nitrogen content for the same rare earth and with decreasing rare-earth ionic radius for the same nitrogen content.

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