Crystallization and microstructure of Na2O-CaO-Nb2O5-P2O5 glasses

被引：0
|
作者：
Stunda-Zujeva, Agnese [1 ]
Krieke, Guna [1 ]
Jakovlevs, Dmitrijs [1 ]
Berzina-Cimdina, Liga [1 ]
机构：
[1] RTU Riga Biomat Innovat & Dev Ctr, LV-1007 Riga, Latvia
来源：
PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B | 2012年 / 53卷 / 03期
关键词：
D O I：
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Glasses in the system Na2O-CaO-Nb2O5-P2O5 were crystallized during cooling and reheating up to 900 degrees C and crystalline phases were compared. Most of glasses showed surface nucleation, except the glass with a 10 mol% niobium content exhbited bulk nucleation. During cooling phosphates (Ca-3(PO4)(2), Ca2P2O7) and niobophosphates (NbPO5, NbOPO4 and Nb18P2.5O50) crystallized. Sodium niobophosphates recrystallized to Na4Nb8P4O32 or Na2Nb6P4O26 during reheating. Samples with highest amount of sodium formed more NaNbO3, samples with phosphate in excess of 35 mol% formed Na2Nb6P4O26 instead of Na4Nb8P4O32. The microstructure for all samples was inhomogeneous and contained crystallites with a large distribution of sizes.
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页码：93 / 98
页数：6
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