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Title: Rare-earth titanate melt structure and glass formation

Journal Article · · International Journal of Applied Glass Science
DOI: https://doi.org/10.1111/ijag.13479 · OSTI ID:1574297
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [3]
  1. Materials Development, Inc., Arlington Heights, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Div.
  3. Materials Development, Inc., Arlington Heights, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Div.

The structure of rare–earth titanate melts and glasses of composition 17RE2O3.83TiO2 have been investigated in situ by aerodynamic levitation with laser heating. Ti K–edge X–ray absorption near–edge structure (XANES) spectroscopy reveals an effect of RE cation size on mean Ti–O coordination numbers (nTiO), which increase from ~4.8(2) in glass–forming La titanate to ~5.1(2) in non–glass–forming Sc titanate liquids. We suggest that the associated increase in OTi3 triclusters in melts bearing smaller RE cations tends to inhibit glass formation. Both XANES and high–energy X–ray diffraction indicate increases in nTiO as the liquids supercool and vitrify. Results are discussed in the context of alkali and alkaline–earth titanate glasses, extending the observed dependence of nTiO on structural basicity (modifier content divided by potential) to trivalent modifiers and the molten state. We suggest that the most stable titanate glasses form close to compositions where, on average, two oxygen anions bond to each titanium, allowing a continuous, disordered Ti–O network of bridging oxygen (OTi2), or with equal numbers of OTi3 triclusters and OTi1 non–bridging oxygen in charge–balance. Here, we report on new glasses formed from praseodymium, europium, and gadolinium titanate melts, the latter being the smallest rare–earth for which binary titanate glasses have been obtained.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1574297
Journal Information:
International Journal of Applied Glass Science, Journal Name: International Journal of Applied Glass Science Journal Issue: 4 Vol. 10; ISSN 2041-1286
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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