Abstract
The broken symmetry in the atomic-scale ordering of glassy versus crystalline solids leads to a daunting challenge to provide suitable metrics for describing the order within disorder, especially on length scales beyond the nearest neighbor that are characterized by rich structural complexity. Here, we address this challenge for silica, a canonical network-forming glass, by using hot versus cold compression to (i) systematically increase the structural ordering after densification and (ii) prepare two glasses with the same high-density but contrasting structures. The structure was measured by high-energy X-ray and neutron diffraction, and atomistic models were generated that reproduce the experimental results. The vibrational and thermodynamic properties of the glasses were probed by using inelastic neutron scattering and calorimetry, respectively. Traditional measures of amorphous structures show relatively subtle changes upon compacting the glass. The method of persistent homology identifies, however, distinct features in the network topology that change as the initially open structure of the glass is collapsed. The results for the same high-density glasses show that the nature of structural disorder does impact the heat capacity and boson peak in the low-frequency dynamical spectra. Densification is discussed in terms of the loss of locally favored tetrahedral structures comprising oxygen-decorated SiSi4 tetrahedra.
Original language | English |
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Article number | 85 |
Journal | NPG Asia Materials |
Volume | 12 |
Issue number | 1 |
DOIs | |
State | Published - Dec 2020 |
Funding
Discussions with Profs. T. Otomo, K. Terakura, S. Tsuneyuki, M. Hatanaka and D. Hiench, and with Drs. K. Suzuya, M. Kobayashi, J. Hook and A. Souslov are gratefully acknowledged and appreciated. We thank Prof. A. Chumakov for providing the heat capacity data sets from Chumakov et al.20. The synchrotron radiation experiments were performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2015A1366, 2016A0134, 2016B0134, 2017A0134, and 2017B0134). A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This research was supported by JST PRESTO Grant Numbers JPMPR15N4 (to S. Kohara), JPMPR15ND (to T.N.), and JPMJPR16N6, Japan (to M.S.); the “Materials Research by Information Integration” initiative (MI2I) project of the Support Program for Starting Up Innovation Hub from JST (to Y.O., S. Kohara, A.M., S.T. and Y.H.); JST CREST 15656429 (to Y.H.); JSPS KAKENHI Grant Numbers JP17H03121 (to A.M.), JP18H04476 (to T.M.), 20H04241 (to Y.O., S. Kohara and M.S.), 20H05878 (to M.S. and S. Kohara), 20H05880 (to A.M.), 20H05881 (to Y.O., S. Kohara and A.H.), and 20H05884 (to M.S. and I.O.); and the TIA collaborative research program “Kakehashi”, TK19-004 (to S. Kohara and T.M.). P.S.S. was supported by the Institute for Mathematical Innovation at the University of Bath, Grant No. IMI/ 201920/011. A.Z. was supported by a Royal Society – EPSRC Dorothy Hodgkin Research Fellowship. A.P. was supported by a PhD studentship funded by the Institut Laue Langevin (ILL) and University of Bath (Collaboration Agreement ILL-1353.1).
Funders | Funder number |
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Institut Laue Langevin | |
Institute for Mathematical Innovation | IMI/ 201920/011 |
MI2I | |
Engineering and Physical Sciences Research Council | |
Royal Society | Royal Society – EPSRC Dorothy Hodgkin Research Fellowship |
Royal Society | |
University of Bath | ILL-1353.1 |
University of Bath | |
Japan Society for the Promotion of Science | 20H05880, 20H05881, 20H05884, JP17H03121, JP18H04476, 20H05878, TK19-004, 20H04241 |
Japan Society for the Promotion of Science | |
Japan Science and Technology Agency | CREST 15656429, “Materials Research by Information Integration” initiative (MI2I) |
Japan Science and Technology Agency | |
Precursory Research for Embryonic Science and Technology | JPMJPR16N6, JPMPR15N4, JPMPR15ND |
Precursory Research for Embryonic Science and Technology |