Structure and solidification specificity of alumina-containing lanthanum-borogermanate glass

The structure and features of crystallization of glasses, which are a precursor of a pyroelectric material with a unique combination of properties, the composition 25La ₂ O ₃ x; 25B ₂ O ₃ & times; 50GeO ₂ depending on the amount of Al ₂ O ₃ addition. It was found that as the alumina content increases, the character of glass crystallization changes significantly: the tendency of glass to oriented surface crystallization of the ferroelectric LaBGeO ₅ is suppressed and the proportion of borate and lanthanum germanate increases. The character of glass crystallization correlates with IR spectroscopy data, according to which changes in the glass structure associated with an increase in the Al ₂ O ₃ content lead to a significant change in the BO _{3 < / sub>: BO 4 . Tab. 1, ill. 6, bibliography: 15 titles.}