Multicomponent phosphate invert glasses with improved processing

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• 作者：Delia S. Brauer<sup>asup><sup> ; sup><sup>delia.brauer@uni-jena.desup> ; Rory M. Wilson<sup>bsup> ; Toshihiro Kasuga<sup>csup>
• 关键词：Biomaterials ; Glasses ; Crystallisation ; Glass transitions ; Thermal properties
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 出版时间：15 July, 2012
• 年：2012
• 卷：358
• 期：14
• 页码：1720-1723
• 全文大小：379 K

文摘

Owing to their structure of small phosphate units, phosphate invert glasses have high crystallisation tendencies, which make processing of the melt challenging. The aim was to improve their processing by (1) increasing the number of glass components and (2) incorporating intermediate oxides (TiO<sub>2sub>, MgO and ZnO). Glasses (P<sub>2sub>O<sub>5sub>-CaO-MgO-Na<sub>2sub>O) were produced by a melt-quench route. In series 1, TiO<sub>2sub> was partially substituted for Na<sub>2sub>O, and the number of components was increased by partially substituting strontium for calcium, zinc for magnesium and potassium for sodium on a molar base. In series 2, the MgO + ZnO content in the multicomponent glass was varied between 0 and 20 mol % in exchange for CaO + SrO. Differential scanning calorimetry showed a significant increase of the processing window in the multicomponent glasses, explained by an increased energy barrier for crystallisation owing to increased entropy of mixing. The MgO + ZnO content also significantly improved the processing window from 117 K (0 mol % MgO + ZnO) to 185 K (20 mol % ), owing to their large field strength. These results show that the processing of phosphate invert glasses for biomedical applications can be improved significantly by incorporating ions such as strontium or zinc which are also known to have therapeutic effects.