Structural studies of Bi 2 O 3 -Nb 2 O 5 -TeO 2 glasses
- Univ. College London (United Kingdom). Dept. of Chemistry; Univ. of Bath (United Kingdom). Dept. of Physics
- Univ. of Limoges (France)
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
- Univ. of Rennes (France)
- Tohoku Univ., Sendai (Japan). Inst. of Multidisciplinary Research for Advanced Materials (IMRAM)
- Univ. College London (United Kingdom). Dept. of Chemistry
Bi2O3-Nb2O5-TeO2 glasses show unusual annealing behavior with appearance of spherulites within the matrix glass structure for the Bi0.5Nb0.5Te3O8 composition. The textures resemble those found previously among polyamorphic Al2O3-Y2O3 glasses containing metastably co-existing high- and low-density phases produced during quenching. However the spherulites produced within the Bi2O3-Nb2O5-TeO2 glass are crystalline and can be identified as an “anti-glass” phase related to β-Bi2Te4O11. Here, we used high energy synchrotron X-ray diffraction data to study structures of binary and ternary glasses quenched from liquids within the Bi2O3-Nb2O5-TeO2 system. These reveal a glassy network based on interconnected TeO4 and TeO3 units that is related to TeO2 crystalline materials but with larger Te…Te separations due to the presence of TeO3 groups and non-bridging oxygens linked to modifier (Bi3 +, Nb5 +) cations. Analysis of the viscosity-temperature relations indicates that the glass-forming liquids are “fragile” and there is no evidence for a LLPT occurring in the supercooled liquid. The glasses obtained by quenching likely correspond to a high-density amorphous (HDA) state. Subsequent annealing above Tg shows mainly evidence for direct crystallization of the “anti-glass” tellurite phase. But, some evidence may exist for simultaneous formation of nanoscale amorphous spherulites that could correspond to the LDA polyamorph. The quenching and annealing behavior of Bi2O3-Nb2O5-TeO2 supercooled liquids and glasses is compared with similar materials in the Al2O3-Y2O3 system.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1389309
- Alternate ID(s):
- OSTI ID: 1396667
- Journal Information:
- Journal of Non-Crystalline Solids, Vol. 451, Issue C; ISSN 0022-3093
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Structure of bismuth tellurite and bismuth niobium tellurite glasses and $Bi_{2}Te_{4}O_{11}$ anti-glass by high energy X-ray diffraction
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text | January 2020 |
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