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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Crystallization of barium magnesium phosphate glasses determined by differential thermal analysis and X-rays diffraction
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Crystallization of barium magnesium phosphate glasses determined by differential thermal analysis and X-rays diffraction

机译：通过差热分析和X射线衍射确定钡镁磷酸盐玻璃的结晶

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摘要

The scope of this work is to determine the crystalline phases of devitrified barium magnesium phosphate glasses and the glass composition which presents the best resistance to crystallization. Barium magnesium phosphate glasses with composition xMgO center dot (1 - x)(60P(2)O(5) - 40BaO) mol% (x = 0, 0.15, 0.3, 0.4, 0.5, and 0.6) were analyzed by differential thermal analysis (DTA) to evaluate the thermal stability against crystallization, and X-ray diffraction (XRD) to identify the crystalline phases formed after devitrification. The glass transition temperature (T-g) increases as the MgO content increases. The maximum temperature attributed to the crystallization peak in the DTA curve (T-g) increases when x increases in the range 0 <= x <= 0.3, and it decreases for x > 0.3. The most thermally stable glass composition against crystallization is for x = 0.3. After the devitrification, the number of coexisting crystalline phases increases as the MgO content increases. For x = 0.3 there is the coexistence of gamma Ba(PO3)(2) and Ba2MgP4O13 phases for devitrified glasses. The trend of the T-c is explained based on the assumptions of changes in the Mg2+ coordination number and the amphoterical features of MgO.
机译：这项工作的范围是确定失透的钡镁磷酸盐玻璃的晶体相以及表现出最佳抗结晶性的玻璃组合物。通过差示热分析法分析了组成为xMgO中心点（1-x）（60P（2）O（5）-40BaO）mol％（x = 0、0.15、0.3、0.4、0.5和0.6）的磷酸钡镁玻璃（DTA）评估对结晶的热稳定性，并使用X射线衍射（XRD）识别失透后形成的结晶相。随着MgO含量的增加，玻璃化转变温度（T-g）增加。当x在0 <= x <= 0.3范围内增加时，DTA曲线（T-g）中归因于结晶峰的最高温度升高，而在x> 0.3时降低。防止结晶的最热稳定的玻璃组合物是x = 0.3。失透后，随着MgO含量的增加，共存结晶相的数量增加。对于x = 0.3，存在用于失透玻璃的γBa（PO3）（2）和Ba2MgP4O13相的共存。基于Mg 2+配位数和MgO的两性特征变化的假设来解释T-c的趋势。

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