Structure of Permanently Densified GeO2 Glass
GeO2 is a prototypical network-forming glass that can be processed under high pressure and temperature conditions to give a permanently densified material, with a density that can be more than 20% greater than the density of the pristine glass prepared at ambient pressure. This low- to high-density amorphous transition has a profound effect on the material properties, but little is known about the accompanying structural changes and the associated mechanisms of network collapse. We will address this problem by using neutron diffraction with Ge isotope substitution to measure the structures of carefully chosen permanently densified GeO2 glasses. The results will be combined with those obtained from high-energy x-ray diffraction to build realistic structural models by refining molecular dynamics configurations via the reverse Monte Carlo method. Hence, we will elucidate the mechanisms of topological change.
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SALMON Philip Stephen; Henry E. Fischer; KOHARA Shinji; ONODERA Yohei and ZEIDLER Anita. (2019). Structure of Permanently Densified GeO2 Glass. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-982
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