Systematic detection of an EPR signal was conducted for three alkali oxide‐Al2O3−SiO2 glass systems. Observed EPR spectra, having a main line with g=2.03 and a broad and anisotropic shape, are attributed to the unsaturated bridging oxygen bond resulting from the breakup of the SiO2 random network. This signal appears in the area AValkali atom ratio >1 for the Na20 and K2O systems, indicating that the collapse of the Al 4‐coordinated structure begins at an equimolar ratio when alumina is substituted for the alkali oxide, whereas somewhat different behavior was observed for the Li2O system.
A new method is proposed for the multiplication of the mass transport effect of thermal diffusion and is applied to gas compression using thermal energy without any machinery. Experiments were carried out for compression of air using a highly porous material as a diffusion medium in order to confirm the principle of the method.
Aus den EPR‐Spektren von Alkalimetalloxid‐Al2O3‐SiO,‐Gläsern geht hervor, daß bei den N320′ und K2O‐Gläsern die Struktur mit vierfach koordiniertem Al zusammenzubrechen beginnt, wenn das Atomverhältnis Al : Na(K) den Wert 1 übersteigt.
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