Improved Prediction of Young's Modulus of Fluorine‐Containing Glasses Using MAS‐NMR Structural Data

摘要: The model developed by Makishima and Mackenzie (M–M) may yield reasonable estimates for the E-modulus of a range glasses. In M–M bonding enthalpy packing densities present in compounds that form glass are taken as input calculation. This study shows more accurate estimate can be obtained incorporating structural information from MAS-NMR data. Specifically, we have determined means impulse excitation technique (IET) ionomer glasses with composition 4.5SiO2–3Al2O3–1.5P2O5–3MO–2MF2, where M denotes alkaline earth metal (M = Mg, Ca, Sr, or Ba). analysis substitution calcium barium strontium results disrupted network, whereas magnesium leads to packed network. this will show how higher coordination state aluminum 27Al into account model. rather small corrections these particular contrast, 19F presence Al–F–M(n) Al–F Si–F–M(n) types environment Si–F bonds not accounted We new F Al Si significantly improved is compared original