Abstract
Abstract The effect of thermal treatment on the crystallization characteristics and phase composition of lithia aluminosilicate glasses with additional constituents of some divalent oxides were examined by DTA, X-ray analysis and microscopy. On partial Al 2 O 3 /Li 2 O replacement, lithia aluminosilicate (β-eucryptite and/or β-spodumene) solid solutions were formed at the expense of lithium silicate phases. The progress of β-eucryptite and/or β-spodumene crystallization was accelerated with the addition of Al 2 O 3 instead of Li 2 O. The stability field of β-eucryptite was shifted to higher temperature if the Al 2 O 3 /Li 2 O ratio exceeded unity. In the presence of mixed divalent cations like Mn 2+ , Ca 2+ and/or Mg 2+ , varieties of pyroxene solid solutions, Mn-containing phases and anorthite were crystallized. The formation of various solid solution phases and their stoichiometric composition were greatly related to the Al 2 O 3 /Li 2 O and/or the divalent oxide ratios in the glass as well as the conditions of thermal treatment.
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