Caloric and volumetric properties of the (Ga12.5Ge12.5Te75)100–x(AgI)x (x = 0–15 mol %) glass system

Authors

  • Daniil O. Patrushev G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Alexander M. Kut’in G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Alexander D. Plekhovich G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Kristina V. Balueva G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Elizaveta A. Tyurina G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Alexander P. Velmuzhov G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation
  • Vladimir S. Shiryaev G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

DOI:

https://doi.org/10.17308/kcmf.2026.28/13687

Keywords:

Telluride glasses, Differential scanning calorimetry, Dilatometry, Thermal expansion, Density, Standard thermodynamic functions

Abstract

Objectives: Glasses based on germanium and gallium tellurides with the addition of silver iodide are promising materials for mid-infrared fiber optics. They exhibit a wide transparency range, a high refractive index, and relatively high stability against crystallization. The aim of this study was to determine the caloric and volumetric properties of glasses in the (Ga12.5Ge12.5Te75)100-x(AgI)x (x = 0–15 mol%) system.

Experimental: The heat capacity of the samples was studied using differential scanning calorimetry in the temperature range of 300–675 K. The thermal expansion of the glasses was measured using interval and dynamic methods. The coefficient of linear thermal expansion in the temperature range of 298 to 403 K was determined by means of dilatometry. The density of the glasses was measured using the hydrostatic weighing method. By jointly processing the experimental data using a unified statistical-thermodynamic model, consistent standard caloric and volumetric functions were calculated in the temperature range from 0 to 520 K.

 Conclusions: The developed theoretical model, based on experimental results, provides a physically justified compression of a significant amount of thermodynamic information into a set of 11 parameters. This method of presenting information is most convenient for technological applications. Within the framework of the used theory, a method for predicting the properties of glasses for intermediate, unstudied compositions is proposed. Increasing the silver iodide content in glasses from 0 to 15 mol % leads to an increase in the coefficients of linear and volumetric expansion. This is explained by a decrease in the degree of connectivity of the structural network and an increase in the ionic nature of chemical bonds. The density of glasses rises with an increase in the AgI content from 5.522 to 5.673±0.005 g/cm3. The results obtained in this study can be used to optimize the chemical composition of glasses, their preparation conditions, and heat treatment during optical fiber drawing

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Author Biographies

  • Daniil O. Patrushev, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Junior Research Fellow, Information Technology Laboratory, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Alexander M. Kut’in, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Dr. Sci. (Chem.), Head of the Information Technology Laboratory, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Alexander D. Plekhovich, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Cand. Sci. (Chem.), Senior Researcher, Information Technology Laboratory, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Kristina V. Balueva, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Cand. Sci. (Chem.), Senior Researcher, Information Technology Laboratory, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Elizaveta A. Tyurina, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Cand. Sci. (Chem.), Researcher, Laboratory of High-Purity Chalcogenide Glasses for Mid-IR Photonics, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Alexander P. Velmuzhov, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Cand. Sci. (Chem.), Senior Researcher, Laboratory of High-Purity Chalcogenide Glasses for Mid-IR Photonics, G. G. Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences (Nizhny Novgorod, Russian Federation)

  • Vladimir S. Shiryaev, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49, Tropinin st., Nizhny Novgorod, 603951, Russian Federation

    Dr. Sci. (Chem.), Deputy Director for Research, G. G. Devyatykh Institute of Chemistry of HighPurity Substances of the Russian Academy of Science (Nizhny Novgorod, Russian Federation)

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Published

2026-06-25

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Vol. 28 No. 2 (2026)

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Original articles

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How to Cite

Caloric and volumetric properties of the (Ga12.5Ge12.5Te75)100–x(AgI)x (x = 0–15 mol %) glass system. (2026). Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 28(2), 248-259. https://doi.org/10.17308/kcmf.2026.28/13687