Highly oriented surface layers of lithium disilicate crystals were grown by crystallizing glasses of the composition Li:O: SiOr. The thickness of the oriented layer was a function of the thermal treatment. The ctystallites in these layers were oriented with their c-axes perpendicular to the sample surface. These layers were found to be pyroelectric as determined by the Chynoweth technique. The pyroelectric responses of the glass-ceramics crystallized in a thermal gradient were approximately tour times larger than that of a tourmaline crystal of similar dimensions.
Highly oriented surface layers of lithium disilicate crystals were grown by crystallizing glasses of composition Li2Si2O5 in a temperature gradient. The polar c axes of the crystallites were oriented parallel to the temperature gradient and perpendicular to the sample surface. The pyroelectric response of the glass-ceramic crystallized in a thermal gradient was approximately four times larger than that of a touramaline crystal of similar dimensions. The time dependence of the pyroelectric signal obeys the thin-film equivalent circuit model developed by Chynoweth.
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