Low-temperature heat capacity and thermodynamic properties of silicon-dioxide-based binary vitreous systems

The concentration and temperature dependences of the heat capacities of vitreous SiO2Al2O3 and SiO2TiO2 systems are studied. The heat‐capacity behaviour of the glasses studied in the range from 5 to 300 K is shown to be described satisfactorily by combinations of the Debye and Einstein heat‐capaci...

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Veröffentlicht in:Physica status solidi. A, Applied research Applied research, 1987-02, Vol.99 (2), p.413-421
Hauptverfasser: Mamedov, K. K., Abdullaev, A. B., Shalumov, B. Z., Mekhtiev, M. I., Alyanov, M. A., Gumbatov, D. O.
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container_issue 2
container_start_page 413
container_title Physica status solidi. A, Applied research
container_volume 99
creator Mamedov, K. K.
Abdullaev, A. B.
Shalumov, B. Z.
Mekhtiev, M. I.
Alyanov, M. A.
Gumbatov, D. O.
description The concentration and temperature dependences of the heat capacities of vitreous SiO2Al2O3 and SiO2TiO2 systems are studied. The heat‐capacity behaviour of the glasses studied in the range from 5 to 300 K is shown to be described satisfactorily by combinations of the Debye and Einstein heat‐capacity functions. It is established that the isotherms of the concentration dependences of heat capacity are of a nonmontonic nature. The dynamic characteristics of a vibrational spectrum and the basis thermodynamic functions of glasses of the SiO2Al2O3 and SiO2TiO2 systems are calculated on the basis of precise calorimetric measurements. Es werden die Konzentrations‐ und Temperaturabhängigkeiten der Wärmekapazitäten von glasartigen SiO2Al2O3‐ und SiO2TiO2‐Systemen untersucht. Das Wärmekapazitätsverhalten der untersuchten Gläser im Bereich von 5 bis 300 K wird befriedigend beschrieben durch Kombinationen der Debye‐ und Einstein‐Wärmekapazitätsfunktionen. Es wird gesichert, daß die Isothermen der Konzentrationsabhängigkeiten der Wärmekapazität nichtmonoton sind. Die dynamischen Charakteristiken des Schwingungsspektrums und die thermodynamischen Grundfunktionen der Gläser der SiO2Al2O3‐ und SiO2TiO2‐Systeme werden auf der Grundlage von genauen kalorimetrischen Messungen berechnet.
doi_str_mv 10.1002/pssa.2210990211
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The heat‐capacity behaviour of the glasses studied in the range from 5 to 300 K is shown to be described satisfactorily by combinations of the Debye and Einstein heat‐capacity functions. It is established that the isotherms of the concentration dependences of heat capacity are of a nonmontonic nature. The dynamic characteristics of a vibrational spectrum and the basis thermodynamic functions of glasses of the SiO2Al2O3 and SiO2TiO2 systems are calculated on the basis of precise calorimetric measurements. Es werden die Konzentrations‐ und Temperaturabhängigkeiten der Wärmekapazitäten von glasartigen SiO2Al2O3‐ und SiO2TiO2‐Systemen untersucht. Das Wärmekapazitätsverhalten der untersuchten Gläser im Bereich von 5 bis 300 K wird befriedigend beschrieben durch Kombinationen der Debye‐ und Einstein‐Wärmekapazitätsfunktionen. Es wird gesichert, daß die Isothermen der Konzentrationsabhängigkeiten der Wärmekapazität nichtmonoton sind. 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subjects Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Thermal properties of condensed matter
Thermal properties of crystalline solids
title Low-temperature heat capacity and thermodynamic properties of silicon-dioxide-based binary vitreous systems
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