Phase transition in niobophosphate glass-ceramic

被引：2

作者：

Stunda, Agnese ^{[1
]}

Mironova-Ulmane, Nina ^{[2
]}

Borodajenko, Natalija ^{[1
]}

Berzina-Cimdina, Liga ^{[1
]}

机构：

[1] RTU Riga Biomat Innovat & Dev Ctr, Riga, Latvia

[2] Univ Latvia, Inst Solid State Phys, Riga, Latvia

来源：

INTER ACADEMIA 2010: GLOBAL RESEARCH AND EDUCATION | 2011年 / 222卷

关键词：

niobophosphate; phase transition; crystallization; glass-ceramic; XRD; RAMAN; FTIR;

D O I：

10.4028/www.scientific.net/AMR.222.259

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase transition during crystallization of glass to glass-ceramic in system P2O5-CaO-Nb2O5-Na2O was studied. Several heating rates were compared - 1, 2, 5, 11 and 20 degrees Cmin(-1). DTA, XRD, FTIR and Raman analyses were performed. Niobophosphate glass-ceramic is found to form utterly different crystalline phases depending on maximal heating temperature, heating rate and time of maximal temperature maintenance. Crystallization temperatures of the same phases are strongly dependent on heating rate, while crystallinity of obtained phases is not. At lower temperatures poorly crystalline phosphates (Ca-3(PO4)(2), Ca10Na(PO4)(7), Ca2P2O7) and niobates (NaNbO3 and Nb2O5) are identified. At higher temperatures a large amount of well crystalline niobophosphate (Na-4(Nb8P4O32) and Ca2P2O2 forms. With increasing amount of Na-4(Nb8P4O32), amount of NaNbO3 and Nb2O5 decreases.

引用

页码：259 / +

页数：2

共 6 条

[1] Solubility of glasses in the system P2O5-CaO-MgO-Na2O-TiO2:: Experimental and modeling using artificial neural networks [J].