Projects per year
Abstract
The method of in situ high-pressure neutron diffraction is used to investigate the structure of B2O3glass on compression in the range from ambient to 17.5(5) GPa. The experimental results are supplemented by molecular dynamics simulations made using a newly developed aspherical ion model. The results tie together those obtained from other experimental techniques to reveal three densification regimes. In the first, BO3 triangles are the predominant structural motifs as the pressure is increased from ambient to 6.3(5) GPa, but there is an alteration to the intermediate range order which is associated with the dissolution of boroxol rings. In the second, BO4 motifs replace BO3 triangles at pressures beyond 6.3 GPa and the dissolution of boroxol rings continues until it is completed at 11-14 GPa. In the third, the B-O coordination number continues to increase with pressure to give a predominantly tetrahedral glass, a process that is completed at a pressure in excess of 22.5 GPa. On recovery of the glass to ambient from a pressure of 8.2 GPa, triangular BO3 motifs are recovered but, relative to the uncompressed material, there is a change to the intermediate range order. The comparison between experiment and simulation shows that the aspherical ion model is able to provide results of unprecedented accuracy at pressures up to at least 10 GPa.
Original language | English |
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Article number | 024206 |
Journal | Physical Review B : Condensed Matter and Materials Physics |
Volume | 90 |
Issue number | 2 |
DOIs | |
Publication status | Published - 31 Jul 2014 |
Fingerprint
Dive into the research topics of 'Density-driven structural transformations in B2 O3 glass'. Together they form a unique fingerprint.Projects
- 3 Finished
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Network Structures: from Fundamentals to Functionality
Salmon, P. (PI) & Zeidler, A. (CoI)
Engineering and Physical Sciences Research Council
5/06/12 → 4/10/15
Project: Research council
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Transformations in B203 Glass Under Pressure
Salmon, P. (PI)
Science and Technology Facilities Council
1/07/10 → 1/11/10
Project: Research council
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Glassy and Liquid Networks: Deformability and Manipulation
Salmon, P. (PI) & Zeidler, A. (Researcher)
Engineering and Physical Sciences Research Council
1/10/08 → 30/12/11
Project: Research council
Profiles
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Anita Zeidler
- Department of Physics - Lecturer
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
- Condensed Matter and Quantum Materials
Person: Research & Teaching, Core staff, Researcher
Equipment
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High Performance Computing (HPC) Facility
Chapman, S. (Manager)
University of BathFacility/equipment: Facility