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Volume 45 All articles Published: 27 September 2022 Article ID 0190
Pressure-induced variations of medium-range order in B$_2$O$_3$ glasses
SOUMEE CHAKRABORTY V SIVASUBRAMANIAN MANVENDRA NARAYAN SINGH ANUJ UPADHYAY ANIL K SINHA T R RAVINDRAN
Lead-borate glasses manifest unique structure with lead oxide composition owing to their dual role of modifier and former. The medium-range signature from the first sharp diffraction peak (FSDP) in lead-borates exhibits substantial correlations due to the presence of superstructural units. Pressure plays an important role in altering bonding characteristics and hence structure in materials. To understand pressure-induced changes in the medium-range order (MRO) in lead-borate glasses, we have carried out high pressure X-ray diffraction studies in the FSDP region of these glasses up to 25 GPa. Two clear peaks, $q_0$ and $q_1$ are observed in all the modified glasses, below and above the position of the FSDP in pure B$_2$O$_3$ glass. This shows that lead oxide alters the FSDP and causes changes in the network structure at the MRO. $q_1$ exhibits an increase under compression, resulting in a reduction in correlation lengths for all glass compositions.The initial steep decrease is accompanied by a lower rate of reduction at higher pressures. This shows that correlations arising from structural voids in the boron matrix exhibit similar decrease for various lead oxide compositions.
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Volume 45 All articles Published: 16 November 2022 Article ID 0230
T R Ravindran Awadhesh Mani N V Chandra Shekar Avesh K Tyagi
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Bulletin of Materials Science
Volume 46, 2023
All articles
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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