biostudies-literatureUnknown10(69)Khanna AThe short-range structure of 20BaO-80TeO₂ glass was studied <i>in situ</i> by high pressure neutron diffraction and high pressure Raman spectroscopy. Neutron diffraction measurements were performed at the PEARL instrument of the ISIS spallation neutron source up to a maximum pressure of 9.0 ± 0.5 GPa. The diffraction data was analysed <i>via</i> reverse Monte Carlo simulations and the changes in the glass short-range structural properties, Ba-O, Te-O and O-O bond lengths and speciation were studied as a function of pressure. Te-O co-ordination increases from 3.51 ± 0.05 to 3.73 ± 0.05, Ba-O coordination from 6.24 ± 0.19 to 6.99 ± 0.34 and O-O coordination from 6.00 ± 0.05 to 6.69 ± 0.06 with an increase in pressure from ambient to 9.0 GPa. <i>In situ</i> high pressure Raman studies found that the ratio of intensities of the two bands at 668 cm^-1 and 724 cm^-1 increases from 0.99 to 1.18 on applying pressure up to 19.28 ± 0.01 GPa, and that these changes are due to the conversion of TeO₃ into TeO₄ structural units in the tellurite network. It is found that pressure causes densification of the tellurite network by the enhancement of co-ordination of cations, and an increase in distribution of Te-O and Ba-O bond lengths. The original glass structure is restored upon the release of pressure.RSC advances42502-42511https://www.ebi.ac.uk/biostudies/studies/S-EPMC9057973biostudies-literature<i>In situ</i> high pressure neutron diffraction and Raman spectroscopy of 20BaO-80TeO₂ glass.PMC9057973Bull CLHirdeshKhanna AFunnell NPTyagi SKaur Afalse<i>In situ</i> high pressure neutron diffraction and Raman spectroscopy of 20BaO-80TeO₂ glass.The short-range structure of 20BaO-80TeO₂ glass was studied <i>in situ</i> by high pressure neutron diffraction and high pressure Raman spectroscopy. Neutron diffraction measurements were performed at the PEARL instrument of the ISIS spallation neutron source up to a maximum pressure of 9.0 ± 0.5 GPa. The diffraction data was analysed <i>via</i> reverse Monte Carlo simulations and the changes in the glass short-range structural properties, Ba-O, Te-O and O-O bond lengths and speciation were studied as a function of pressure. Te-O co-ordination increases from 3.51 ± 0.05 to 3.73 ± 0.05, Ba-O coordination from 6.24 ± 0.19 to 6.99 ± 0.34 and O-O coordination from 6.00 ± 0.05 to 6.69 ± 0.06 with an increase in pressure from ambient to 9.0 GPa. <i>In situ</i> high pressure Raman studies found that the ratio of intensities of the two bands at 668 cm^-1 and 724 cm^-1 increases from 0.99 to 1.18 on applying pressure up to 19.28 ± 0.01 GPa, and that these changes are due to the conversion of TeO₃ into TeO₄ structural units in the tellurite network. It is found that pressure causes densification of the tellurite network by the enhancement of co-ordination of cations, and an increase in distribution of Te-O and Ba-O bond lengths. The original glass structure is restored upon the release of pressure.2020-01-01T00:00:00Z2020 Nov2025-04-04T14:49:29.913Z2025-04-04T14:49:29.913ZS-EPMC90579733551677510.1039/d0ra07867k