The gel synthesis and the crystn. behavior of glass powders in the Li2Ge4O9-Na2Ge4O9 compn. range were studied. The effects of replacing Li2O by Na2O on the glass transition temp. and devitrification behavior were examd. The gel prepn. involves hydrolysis and polycondensation of germanium ethoxide with lithium methoxide and/or sodium ethoxide. The gels thus prepd. are amorphous solids contg. water and org. residues that are lost on heating. Progressive substitution of sodium oxide for lithium oxide causes the glass transition temp. to go through a min. according to the mixed alkali effect. The crystg. phases and gels have similar structures.
Gel synthesis and crystallization of glass powders in the Li2Ge4O9-Na2Ge4O9 composition range / M., Catauro; Aronne, Antonio; Pernice, Pasquale; A., Marotta. - In: JOURNAL OF MATERIALS SCIENCE LETTERS. - ISSN 0261-8028. - STAMPA. - 15:(1996), pp. 817-819. [10.1007/BF00274616]
Gel synthesis and crystallization of glass powders in the Li2Ge4O9-Na2Ge4O9 composition range
ARONNE, ANTONIO;PERNICE, PASQUALE;
1996
Abstract
The gel synthesis and the crystn. behavior of glass powders in the Li2Ge4O9-Na2Ge4O9 compn. range were studied. The effects of replacing Li2O by Na2O on the glass transition temp. and devitrification behavior were examd. The gel prepn. involves hydrolysis and polycondensation of germanium ethoxide with lithium methoxide and/or sodium ethoxide. The gels thus prepd. are amorphous solids contg. water and org. residues that are lost on heating. Progressive substitution of sodium oxide for lithium oxide causes the glass transition temp. to go through a min. according to the mixed alkali effect. The crystg. phases and gels have similar structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
