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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 >Structure and rheological properties of the RE-Si-Mg-O-N (RE = Sc, Y, La, Nd, Sm, Gd, Yb and Lu) glasses
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Structure and rheological properties of the RE-Si-Mg-O-N (RE = Sc, Y, La, Nd, Sm, Gd, Yb and Lu) glasses

机译：RE-Si-Mg-O-N（RE = Sc，Y，La，Nd，Sm，Gd，Yb和Lu）玻璃的结构和流变特性

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Structure, viscosity, glass transition temperature, Littleton temperature and elastic moduli were investigated by MAS-NMR spectroscopy, compressive creep, dilatometry and ultrasound velocity experiments, in order to reveal the effects of rare earth elements and nitrogen on the behavior of RE-Si-Mg-O-N glasses (RE = Sc, Y, La, Nd, Sm, Gd, Yb and L) with different nitrogen contents. NMR showed that nitrogen modifies the glass structure depending on RE type via increasing content of SiO3N(+Q(1)) units at the expense of Q(2) units and Lu seems to be more effective in their formation than La. Despite that, the effects of rare-earth modifiers and nitrogen as network former are independent, additive and a synergy effect was not observed. Approximately linear dependencies of most properties on molar volume (and ionic radii) suggest that glass network is tightened proportionally to ionic radius of corresponding modifier and cross-linking is proportional to nitrogen content. However, the mechanism involved in lanthanide effect is different from that of Sc and Y additives, although they result in properties similar to those of Lu-containing glasses. Irregularities found for Yb and Sm additives at elevated temperatures may be related to the change of valence state. (C) 2004 Published by Elsevier B.V.
机译：通过MAS-NMR光谱，压缩蠕变，膨胀学和超声速度实验研究了结构，粘度，玻璃化转变温度，Littleton温度和弹性模量，以揭示稀土元素和氮对RE-Si-的行为的影响。具有不同氮含量的Mg-ON玻璃（RE = Sc，Y，La，Nd，Sm，Gd，Yb和L）。 NMR显示，氮气通过增加SiO3N（+ Q（1））单元的含量而以Q（2）单元为代价，通过改变RE类型来改变玻璃结构，Lu的形成似乎比La更有效。稀土改性剂和氮作为网络形成剂的作用是独立的，加和的，没有观察到协同作用。大多数性质对摩尔体积（和离子半径）的近似线性依赖性表明，玻璃网络与相应改性剂的离子半径成比例地收紧，而交联与氮含量成比例。但是，镧系元素作用机理与Sc和Y添加剂不同，尽管它们产生的特性类似于含Lu的玻璃。在高温下发现Yb和Sm添加剂的不规则性可能与价态的变化有关。 （C）2004由Elsevier B.V.发布

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