Nanoglassy oxides via mechanochemistry: the formation mechanism, the short-range structure, functional properties and the thermal stability

采用远离平衡的一步机械合成法制备了新型纳米晶LiMX_2 O_6（M = Fe ~（3+），Al ~（3+），Ga ~（3+）; X = Si ~（4+），Ge ~（4+））。由于它们能够探测特定原子核的局部环境，互补的核光谱方法，如多核NMR和穆斯堡尔谱，将提供对氧化物纳米玻璃短程结构的详细了解。主要的重点将被给予澄清的机制引起的机械触发形成的nanoglassy建筑块的密度增强分离的界面无定形区域中的机械合成材料的密度降低。纳米玻璃氧化物的局部原子和电子结构的定量信息将通过对其动态，电学和磁学行为的研究来补充，目的是对其功能特性的基本起源提供清晰的解释。为了确定纳米玻璃的热稳定性的范围，并确定其在局部尺度上的平衡状态的弛豫路径，还将研究机械合成的固体对温度变化的响应。

Novel nanoglassy Li-containing pyroxene-type compounds with the composition of LiMX2O6 (M = Fe3+, Al3+, Ga3+; X = Si4+, Ge4+) will be prepared via far-from equilibrium one-step mechanosynthesis. Due to their capabilities to probe the local environment of a particular nucleus, complementary nuclear spectroscopic methods such as multi-nuclear NMR- and Mössbauer spectroscopies will provide detailed insight into the short-range structure of the oxide nanoglasses. The main focus will be given to the clarification of the mechanisms giving rise to the mechanically triggered formation of nanoglassy building blocks of enhanced density separated by interfacial amorphous regions with a reduced density in the mechanosynthesized materials. Quantitative Information on the local atomic and electronic structures of the nanoglassy oxides will be complemented by the investigation of their dynamic, electric and magnetic behavior with the aim to provide a clear-cut explanation of the fundamental origin of their functional properties. In order to determine the range of thermal stability of the nanoglasses and to identify their relaxation paths to the equilibrium state at the local scale, the response of the mechanosynthesized solids to changes in temperature will also be studied.