The intermediate range order of covalent glasses has been extensively studied in terms of the first sharp diffraction peak (FSDP), but the direct observation of the atomic density fluctuations that give rise to FSDP is still lacking.
The intermediate range order of covalent glasses has been extensively studied in terms of the first sharp diffraction peak , but the direct observation of the atomic density fluctuations that give rise to FSDP is still lacking. Addressing this gap, researchers employed a new energy-filtered angstrom-beam electron diffraction technique to provide the direct experimental observation for the origin of FSDP in silica glass, providing important insights into the atomic structure of glasses.
Scattering experiments provide a distinct signature of IRO. In these experiments, high-energy beams like X-rays and neutron beams are scattered by the atoms of a sample. The scattered waves then interfere constructively or destructively, resulting in bright or dark spots respectively. The bright spots are called diffraction peaks. For IRO in covalent glasses, a distinct diffraction peak called the first sharp diffraction peak has been observed.
Analysis revealed that the periodic atomic density fluctuations corresponding to FSDP originated from alternating arrangements of chain-like columnar atomic configurations and interstitial tube-like voids. Notably, the tube-like voids were limited to a length of two nanometers. The columnar arrangements formed pseudo-two-dimensional atomic planes, providing a more specific description of the quasilattice planes.
Overall, this research advances our understanding of the atomic structure of glasses, providing new directions for material control and development.Researchers have achieved real-time capture of the ionization process and subsequent structural changes in gas-phase molecules through an enhanced mega-electronvolt ultrafast electron diffraction ...
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