The EPR and optical absorption spectra of V 4+ ions and their relationship with the structural features of glasses of the La 2 O 3 - Al 2 < / sup> O 3 - SiO 2 . Three characteristic ranges of EPR parameters of V 4+ ions have been established: I - A II & # 8776; 167 x 10 -4 cm -1 , g II = 1.937 - 1.938; II - A II & # 8776; (163 ... 164) x; 10 -4 cm -1 , g II = 1.939 - 1.940; III - A II & # 8776; (156 ... 159) ?; 10 -4 cm -1 , g II = 1.945. It was shown that in the region with a low La 2 O 3 content, lanthanum plays predominantly the role of a modifier ion, while in glasses with a high La 2 O 3 lanthanum gradually takes a place in the glass network, linking silicon-oxygen and alumino-oxygen tetrahedrons, i.e., it becomes a glass former despite the large ionic radius. Glasses in region III with a high La 2 O 3 content have a high softening point and an abnormally high thermal conductivity (& # 8776; 12.6 W / (m * K)) .Table. 2, ill. 6, bibliography: 10 titles.
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