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Crystallization and phase equilibrium in the sodium barium metaphosphate system

机译:偏磷酸钠钡体系中的结晶和相平衡

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Crystallization of sodium barium metaphosphate glasses has been studied by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and thermal analysis. The glasses studied have compositions given by the general formula (50 - x)Na2O-xBaO-50P(2)O(5), where x = 0, 10, 20, 30, 40 or 50. These glasses crystallize from the surface in the absence of a nucleating agent, but interior crystallization can be induced by inclusion of a nucleating agent (Pt) in the batch. The nucleated glasses can be converted to glass-ceramics with an appropriate heat treatment. Phase relations have been determined for the pseudobinary system. The phases formed, i.e. NaPO3, Na4Ba(PO3)(6), Na4Ba(PO3)(3) and Ba(PO3)(2), are those predicted by the published equilibrium diagram. In some cases, however, three phases were present in region of the diagram where only two equilibrium phases should exist. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 13]
机译:已经通过X射线衍射,扫描电子显微镜,能量分散光谱和热分析研究了偏磷酸钠钡玻璃的结晶。研究的玻璃具有由通式(50-x)Na2O-xBaO-50P(2)O(5)给出的组成,其中x = 0、10、20、30、40或50。这些玻璃从表面上的结晶不含成核剂,但批料中包含成核剂(Pt)可以诱导内部结晶。可以通过适当的热处理将有核玻璃转变成玻璃陶瓷。已经确定了伪二进制系统的相位关系。 NaPO3,Na4Ba(PO3)(6),Na4Ba(PO3)(3)和Ba(PO3)(2)形成的相是已发表的平衡图预测的相。但是,在某些情况下,该图的区域中存在三个阶段,其中仅应存在两个平衡阶段。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:13]

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