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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 >Phosphate speciation in Na2O-CaO-P2O5-SiO2 and Na2O-TiO2-P2O5-SiO2 glasses
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Phosphate speciation in Na2O-CaO-P2O5-SiO2 and Na2O-TiO2-P2O5-SiO2 glasses

机译：Na2O-CaO-P2O5-SiO2和Na2O-TiO2-P2O5-SiO2玻璃中的磷酸盐形态

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P2O5 was added in amounts of 0.4-2.5 mol% to (5.1-41.9)Na2O-(5.3-35.1)CaO-(51.0-66.9)SiO2 and (35.4- 38)Na2O-(4.7-9.8)TiO2-(50-58.7)SiO2 glasses. Sodium and calcium ions were also added to maintain the charge balance on the phosphate complexes, without modification of the silicate condensation. P-31 magic-angle-spinning nuclear magnetic resonance spectra of Na2O-CaO-P2O5-SiO2 glasses show that the phosphate complexes are monophosphate and diphosphate. The linear dependance of P-31 chemical shifts with CaO/(CaO + Na2O) is consistent with a random distribution of sodium and calcium around phosphate complexes, except for diphosphates at CaO/(CaO + Na2O) less than 0.3. The relative proportion of mono- and diphosphate is analyzed in terms of an acid-base reaction involving exchange of O2-. We suggest that the amount of monophosphate larger than predicted by basicity analysis is consistent with calcium monophosphate complexes forming, and shifting the acid-base equilibria. An additional discrete P-31 resonance in the Na2O-TiO2-P2O5-SiO2 glass spectra is attributed to titanium hearing phosphate complexes. They reveal the formation of Ti-O-P covalent bonds, owing to the electrostatic field strength of Ti4- ions. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 19]
机译：P2O5以0.4-2.5 mol％的量添加到（5.1-41.9）Na2O-（5.3-35.1）CaO-（51.0-66.9）SiO2和（35.4-38）Na2O-（4.7-9.8）TiO2-（50- 58.7）SiO2玻璃。还添加钠和钙离子，以保持磷酸酯络合物上的电荷平衡，而不会改变硅酸盐的缩合。 Na 2 O-CaO-P 2 O 5 -SiO 2玻璃的P-31自旋角核磁共振光谱表明，磷酸盐配合物是单磷酸盐和二磷酸盐。 Ca-O /（CaO + Na2O）与P-31化学位移的线性相关性与钠和钙在磷酸盐配合物周围的随机分布一致，除了CaO /（CaO + Na2O）小于0.3的二磷酸盐。根据涉及到O 2交换的酸碱反应来分析单磷酸酯和二磷酸酯的相对比例。我们建议，单磷酸盐的量大于通过碱度分析预测的量，这与单磷酸钙复合物的形成以及改变酸碱平衡相一致。 Na2O-TiO2-P2O5-SiO2玻璃光谱中的另一个离散P-31共振归因于钛听力磷酸盐配合物。由于Ti4-离子的静电场强度，它们揭示了Ti-O-P共价键的形成。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：19]

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