Abstract
The crystallization process of the glasses based on the lithium-borosilicate system containing CaO and/or MgO has been investigated by X-ray diffractometry, DTA and scanning electron microscopy (SEM). Lithium metasilicate was formed as a major phase constituent during the crystallization of the glasses. However, lithium disilicate and α-quartz were crystallized as well. On the addition of CaO at the expense of B 2O 3, calcium silicate (wollastonite) and calcium borate were crystallized together with varieties of lithium borate phases including lithium diborate, lithium tetraborate and lithium pyroborate, which were mostly formed as functions of the CaO B 2 O 3 and Li 2 O B 2 O 3 ratios in the glasses, as well as the heat treatment applied. Pyroxene phase of diopsidic [CaMgSi 2O 6] type was also formed due to the replacement of CaO and MgO instead of B 2O 3 and Li 2O, respectively. The role played by the glass oxide constituents in determining the crystallization characteristics of the glasses, as well as the conditions at which the crystallized phase assemblages were formed, are discussed.
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