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Temperature‐Induced Structural Modifications Between Alkali Borate Glasses and Melts
Author(s) -
Cormier L.,
Majérus O.,
Neuville D. R.,
Calas G.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00657.x
Subject(s) - boron , alkali metal , raman spectroscopy , borate glass , neutron diffraction , materials science , inorganic chemistry , yield (engineering) , lithium borate , isotopes of boron , crystallography , chemistry , crystal structure , metallurgy , organic chemistry , physics , optics
High‐temperature neutron diffraction and Raman spectra have been obtained on M 2 O–2B 2 O 3 (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.