Regions of phase crystallization in the ternary system Na2O-Al2O3-B2O3

被引：4

作者：

Binev, D ^{[1
]}

Nikolov, V ^{[1
]}

Peshev, P ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2005年 / 391卷 / 1-2期

关键词：

optical materials; oxide materials; phase diagrams; crystallization; crystal growth;

D O I：

10.1016/j.jallcom.2004.08.046

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：

The concentration and temperature regions of formation of crystals from different phases in the ternary system Na2O-Al2O3-B2O3 were determined using the results on spontaneous crystallization in various high-temperature solutions of this system. The study was limited to solutions in which the contents of the three oxides varied between 20 and 55 mol% for Na2O, 0 and 35 mol% for Al2O3 and 25 and 55 mol% for B2O3, respectively. Evaporation losses, creeping and extremely high viscosities were not observed in these solutions. In the above limits, the crystallization regions of Al2O3, NaBO2, NaAlO2 and the double oxyborate Na2Al2B2O7 (Na2Al2(BO3)(2)O) were determined. As Na2Al2B2O7 was found to melt incongruently at 970 +/- 3 +/-degrees C, this made the high-temperature solution growth most appropriate for obtaining its single crystals. Studies on the habit of Na2Al2B2O7 crystals grown in different zones of its crystallization region led to some preliminary conclusions concerning the composition of the flux growth solutions. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：256 / 261

页数：6

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