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Title: Structural studies of Bi 2 O 3 -Nb 2 O 5 -TeO 2 glasses

Journal Article · · Journal of Non-Crystalline Solids
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [5];  [6]
  1. Univ. College London (United Kingdom). Dept. of Chemistry; Univ. of Bath (United Kingdom). Dept. of Physics
  2. Univ. of Limoges (France)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  4. Univ. of Rennes (France)
  5. Tohoku Univ., Sendai (Japan). Inst. of Multidisciplinary Research for Advanced Materials (IMRAM)
  6. 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
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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