掺杂TiO2的堇青石玻璃成核过程中的结构重排
Rearrangement of the structure during nucleation of a cordierite glass doped with TiO2
摘要：
无序材料的有序化发生在成核的活化过程中，这需要形成必须克服热力学势垒的临界团簇。这些团簇的表征在实验上具有挑战性，但必须改进成核理论。本文利用中子散射技术和~（27）Al核磁共振技术研究了含成核氧化物TiO_2的镁铝硅酸盐玻璃的成核过程。我们确定了结构的变化引起的钛原子周围的晶体的形成，并证明了重要的结构重组的玻璃基质。
英文摘要：
Ordering of disordered materials occurs during the activated process of nucleation that requires the formation of critical clusters that have to surmount a thermodynamic barrier. The characterization of these clusters is experimentally challenging but mandatory to improve nucleation theory. In this paper, the nucleation of a magnesium aluminosilicate glass containing the nucleating oxide TiO2 is investigated using neutron scattering with Ti isotopic substitution and 27Al NMR. We identified the structural changes induced by the formation of crystals around Ti atoms and evidenced important structural reorganization of the glassy matrix.
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