SOL-GEL PROCESSING AND CRYSTALLIZATION OF LITHIUM TETRAGERMANATE

被引：7

作者：

ARONNE, A ^{[1
]}

CATAURO, M ^{[1
]}

PERNICE, P ^{[1
]}

MAROTTA, A ^{[1
]}

机构：

[1] UNIV NAPOLI FEDERICO II,DEPT MAT & PROD ENGN,PIAZZALE TECCHIO,I-80125 NAPLES,ITALY

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1993年 / 152卷 / 2-3期

关键词：

D O I：

10.1016/0022-3093(93)90242-P

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Lithium tetragermanate gel was synthesized by hydrolitic polycondensation of germanium ethoxide with lithium hydroxide monohydrate in alcoholic medium. Crystallization behaviour of the gel, examined by differential thermal analysis and X-ray diffraction, is reported and discussed. Lithium tetragermanate gel crystallizes in two steps. In the primary transformation, at about 560-degrees-C, microcrystallites of Li2Ge4O9 and GeO2 are crystallized in an amorphous matrix. In the second transformation, at about 600-degrees-C, well shaped Li2Ge4O9 and Li2Ge7O15 are formed. The values of activation energy for the two stages are found to be 557 and 405 kJ mol-1, respectively. Activation energies are comparable with those reported with conventional melt glasses from oxides.

引用

页码：137 / 142

页数：6

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