Composition-Property-Structure Correlations of Scandium Aluminosilicate Glasses Revealed by Multinuclear 45Sc, 27Al, and 29Si Solid-State NMR

被引:54
作者
Pahari, Bholanath [1 ]
Iftekhar, Shahriar [1 ]
Jaworski, Aleksander [1 ]
Okhotnikov, Kirill [1 ]
Jansson, Kjell [2 ]
Stevensson, Baltzar [1 ]
Grins, Jekabs [2 ]
Eden, Mattias [1 ]
机构
[1] Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, Div Phys Chem, SE-10691 Stockholm, Sweden
[2] Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, Inorgan & Struct Chem Div, SE-10691 Stockholm, Sweden
基金
瑞典研究理事会;
关键词
O-N GLASSES; ELASTIC PROPERTIES; RARE-EARTHS; AL-27; NMR; SC-45; LANTHANUM; LA; YTTRIUM; SPECTROSCOPY; SI-29;
D O I
10.1111/j.1551-2916.2012.05288.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Many features of aluminosilicate glasses incorporating a rare-earth (RE) ion are dictated by its mass and cation field strength (CFS). ScAlSiO glasses are interesting because Sc3+ exhibits the highest CFS but the lowest mass of all RE3+ ions. We explore relationships between the glass composition and several physical properties, such as density, glass-transition temperature (Tg), Vickers hardness, and refractive index, over the glass forming region of the ternary Sc2O3Al2O3SiO2 system. The glasses exhibit uniform and unexpectedly low Tg-values (similar to 875 degrees C), but a high microhardness (approximate to 9.3 GPa) that correlates with the Sc2O3 content. 29Si magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy shows enhanced deshielding and a minor glass-network ordering as either the Al or Sc content of the glass increases. 27Al MAS NMR reveals that besides the expected AlO4 tetrahedra, substantial amounts of AlO5 (31%35%) and AlO6 (approximate to 5%) polyhedra are present in all ScAlSiO glass structures. 45Sc isotropic chemical shifts (similar to 92 ppm) derived from MAS and 3QMAS (triple-quantum MAS) NMR experiments are consistent with ScO6 environments.
引用
收藏
页码:2545 / 2553
页数:9
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