Polarization properties and a local structure of (GeSe₂)x(Sb2Se₃)₁-x glasses

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2002
• Main Authors: Malesh, V.I., Rubish, V.V., Shpak, I.I., Rubish, V.M., Puha, P.P.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2002
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/121346
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Polarization properties and a local structure of (GeSe₂)x(Sb2Se₃)₁-x glasses / V.I. Malesh, V.V. Rubish, I.I. Shpak, V.M. Rubish, P.P. Puha // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2002. — Т. 5, № 4. — С. 385-390. — Бібліогр.: 19 назв. — англ.

The results of investigating different parameters (of glasses in Ge-Sb-Se system have been given. The values of structural-sensitive molar IR polarization F have been calculated and its concentrational dependence has been constructed. The polarity of chemical bonds has been estimated. It has been shown that with increasing the content of Sb₂Se₃ in the composition of the glasses the polarity of Sb-Se bonds rises. Within the limits of free volume conception the formation energy (Eh) and the volume (Vh) of microcavities have been calculated. Eh and Vh are structural-sensitive parameters of glassy materials. It has been shown that the inflection is observed in concentrational dependences of investigated and calculated parameters of (GeSe₂)x(Sb₂Se₃)₁-x glasses in the vicinity of x = 0.60. It testifies to the structural changes in the glasses while changing the composition. The structure of (GeSe₂)x(Sb₂Se₃)₁-x glasses is mainly determined by structural units GeSe₄/₂ and SbSe₃/₂, to be statistically distributed into matrices. The increase of Sb₂Se₃ content in GeSe₂ is accompanied by a gradual transition from tetrahedrally co-ordinated structural units in glassy GeSe₂, to trigonally co-ordinated - in Sb₂Se₃.