Correlation between the activation energies of structural relaxation and viscous flow for BaO-P2O5-Al2O3 glasses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916409" target="_blank" >RIV/00216275:25310/20:39916409 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022309320301150?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022309320301150?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2020.119998" target="_blank" >10.1016/j.jnoncrysol.2020.119998</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Correlation between the activation energies of structural relaxation and viscous flow for BaO-P2O5-Al2O3 glasses

Popis výsledku v původním jazyce

Viscosity and structural relaxation were studied by thermomechanical analysis for six Al2O3 -doped BaO-P2O5 glasses. The low-temperature viscosity data (10(7) - 10(11) Pa.s) were described and modeled by the Vogel-Fulcher-Tammann, Avramov-Milchev and Mauro-Yue-Ellison-Gupta-Allan equations. Temperature dependence of the activation energy of viscous flow was determined from the tangent of the extrapolated (in terms of the three viscosity equations) viscosity-temperature data-curves. Values of the activation energy of viscous flow were compared to the activation energies of volume relaxation determined from the exact physico-chemical description of the cyclic thermomechanical measurements performed over the glass transition region. In addition, differential scanning calorimetry was used to determine the activation energies of enthalpy relaxation. Good correspondence between the relaxation and viscosity activation energies was found in the respective temperature ranges. Good agreement was also confirmed for the viscosity and enthalpy fragilities, as well as for the indicator of the thermodynamic fragility.

Název v anglickém jazyce

Correlation between the activation energies of structural relaxation and viscous flow for BaO-P2O5-Al2O3 glasses

Popis výsledku anglicky

Viscosity and structural relaxation were studied by thermomechanical analysis for six Al2O3 -doped BaO-P2O5 glasses. The low-temperature viscosity data (10(7) - 10(11) Pa.s) were described and modeled by the Vogel-Fulcher-Tammann, Avramov-Milchev and Mauro-Yue-Ellison-Gupta-Allan equations. Temperature dependence of the activation energy of viscous flow was determined from the tangent of the extrapolated (in terms of the three viscosity equations) viscosity-temperature data-curves. Values of the activation energy of viscous flow were compared to the activation energies of volume relaxation determined from the exact physico-chemical description of the cyclic thermomechanical measurements performed over the glass transition region. In addition, differential scanning calorimetry was used to determine the activation energies of enthalpy relaxation. Good correspondence between the relaxation and viscosity activation energies was found in the respective temperature ranges. Good agreement was also confirmed for the viscosity and enthalpy fragilities, as well as for the indicator of the thermodynamic fragility.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

—

Svazek periodika

536

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

"119998-1"-"119998-10"

Kód UT WoS článku

000527028300010

EID výsledku v databázi Scopus

2-s2.0-85080984022