Vibrational investigation of Lithium metaborate (cas 13453-69-5)-metaaluminate glasses and crystals

Add time:08/08/2019    Source:sciencedirect.com

Lithium metaborate-metaaluminate glasses xLiAlO2·(1−x)LiBO2, (0≤ x ≤0.42), and crystals (Li3B2AlO6, Li2BAlO4) have been prepared and studied by infrared and Raman spectroscopies. The two crystalline compounds have similar networks made of AlØ4− and BØ2O− units (Ø, O: bridging and terminal oxygen atoms, respectively) in arrangements which maximize the number of BOAl linkages. Both compounds decompose at high temperatures into α-LiBO2 and γ-LiAlO2. Increasing x in glass induces the isomerization of BØ4− tetrahedra to BØ2O− triangles, while aluminum forms AlØ4− units. This structural scheme is sufficient to account for the minimum in the glass transition temperature observed for x ≈ 0.25. There is no vibrational evidence for the presence of AlO5 or AlO6 polyhedra in glass, although their presence in small amounts cannot be excluded. Glasses and crystals of the same stoichiometry (x = 0.33) are differentiated by an excess of kinetically arrested BOB and AlOAl linkages in the former.

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