Strontium environment transition in tin silicate glasses by neutron and X-ray diffraction |
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| Institution: | 1. Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA;2. New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003-8001, USA;3. Manuel Lujan Jr. Neutron Scattering Center, TA-53, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;4. Physics Department, Warwick University, Coventry CV4 7AL, UK;5. Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA;6. Department of Materials and Applied Science, Cranfield University, Royal Military College of Science, Defence Academy, Shrivenham, Oxfordshire SN6 8EA, UK |
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| Abstract: | The effect of Sr modifier atoms on the structure of stannosilicate glasses of composition (Sr0)x(SnO)0.5−x(SiO2)0.5, with 0 ⩽ x ⩽ 0.15, has been studied using Mössbauer spectroscopy and neutron and X-ray diffraction. The tin is mostly in the Sn2+ state. The Sr–O bond length undergoes a step decrease from (2.640 ± 0.005) Å to (2.585 ± 0.005) Å as x increases from 0.10 to 0.15, indicating a decrease in co-ordination number from 8 to 7. A Sn–Sn distance of 3.507 ± 0.005 Å is revealed by a first-order difference calculation from the x = 0 sample. This is too short to be consistent with significant edge sharing of SnO3] trigonal pyramids. |
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