Temperature-Induced Structural Modifications Between Alkali Borate Glasses and Melts

High‐temperature neutron diffraction and Raman spectra have been obtained on M2O–2B2O3 (M=Li, Na, K) glasses and melts. Both techniques indicate a coordination change of boron atoms: the tetrahedral boron sites present in the glasses are converted into triangular boron sites. These changes of the bo...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2006-01, Vol.89 (1), p.13-19
Main Authors: Cormier, L., Majérus, O., Neuville, D. R., Calas, G.
Format: Article
Language:English
Subjects:
Alkalies
Borates
Boron
Ceramics
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
Glass
Glasses
High temperature
Liquids
Materials science
Melting
Melts
Molecular structure
Neutron diffraction
Physical properties
Physics
Structure of associated liquids: electrolytes, molten salts, etc
Structure of liquids
Structure of solids and liquids
crystallography
Tables
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Summary:High‐temperature neutron diffraction and Raman spectra have been obtained on M2O–2B2O3 (M=Li, Na, K) glasses and melts. Both techniques indicate a coordination change of boron atoms: the tetrahedral boron sites present in the glasses are converted into triangular boron sites. These changes of the borate network yield modifications of the alkali environment, as assessed for Li using the isotopic substitution technique. We observe that Li atoms are in a charge‐compensating position in the glass and in a modifying position in the liquid. These structural modifications have important implications toward understanding the physical properties of borate melts.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00657.x