Title: Finding Structural Order in Disordered Materials
Speaker: Dr. Howard Sheng, GMU
Time: January 11, 2021 03:00 PM Eastern Time (US and Canada)
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Abstract: Disordered materials are ubiquitous in nature, ranging from liquids, glasses to complex structures such as proteins and biopolymers. Unlike crystals, disordered materials lack the long-range periodicity that defines crystals, which makes it extremely difficult to describe the atomic-level structures. Nonetheless, the atoms in disordered materials are not completely random, there is certain structural order hidden in the disordered systems. Therefore, unraveling structure ordering in disordered systems is key to understanding, utilizing, and designing disordered materials. In this talk, I will review several types of structural order we discovered in amorphous solids and liquids, achieved by combining advanced computational approaches and experimental characterization. At last, I will focus on our recent work on the structural ordering and phase transitions in group IV elements. If time permits, I will highlight a new type of structural order in the form of paracrystals in an amorphous diamond.