Thermo-kinetic and structural characterization of Ce-doped glasses based on Bioglass 45S5

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F23%3A39920256" target="_blank" >RIV/00216275:25310/23:39920256 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0254058423005412?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0254058423005412?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchemphys.2023.127833" target="_blank" >10.1016/j.matchemphys.2023.127833</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermo-kinetic and structural characterization of Ce-doped glasses based on Bioglass 45S5

Popis výsledku v původním jazyce

Thermo-kinetic behavior of Ce-doped 45S5 bioactive glass (addition of CeO2 up to 1.5 mol.%) was explored by means of calorimetry and thermomechanical analysis. The apparent activation energy of structural relaxation was estimated to vary in the 540-670 kJ mol-1 range. The relaxation process exhibited broad distribution of relaxation times and the relaxation motions were found to only weakly depend on the material&apos;s structure. The activation energy of viscous flow was found to vary in the 585-615 kJ mol-1 range; the viscosity itself showed Arrhenian behavior within 107-1011 Pa s. Thermal stability of the glasses was found to be non-monotonous and generally very low, with the most stable glass composition being 45S5 + 0.5 mol.% CeO2. The cold crystallization was found to behave autocatalytically, with the activation energy decreasing from 360 to 310 kJ mol- 1 with the gradual addition of CeO2. While the bulk glasses were crystallization-resistant up to 620 degrees C, the powdered material with CeO2 content &gt;= 1 mol.% was predicted to crystallize even at temperatures slightly above the glass transition temperature.

Název v anglickém jazyce

Thermo-kinetic and structural characterization of Ce-doped glasses based on Bioglass 45S5

Popis výsledku anglicky

Thermo-kinetic behavior of Ce-doped 45S5 bioactive glass (addition of CeO2 up to 1.5 mol.%) was explored by means of calorimetry and thermomechanical analysis. The apparent activation energy of structural relaxation was estimated to vary in the 540-670 kJ mol-1 range. The relaxation process exhibited broad distribution of relaxation times and the relaxation motions were found to only weakly depend on the material&apos;s structure. The activation energy of viscous flow was found to vary in the 585-615 kJ mol-1 range; the viscosity itself showed Arrhenian behavior within 107-1011 Pa s. Thermal stability of the glasses was found to be non-monotonous and generally very low, with the most stable glass composition being 45S5 + 0.5 mol.% CeO2. The cold crystallization was found to behave autocatalytically, with the activation energy decreasing from 360 to 310 kJ mol- 1 with the gradual addition of CeO2. While the bulk glasses were crystallization-resistant up to 620 degrees C, the powdered material with CeO2 content &gt;= 1 mol.% was predicted to crystallize even at temperatures slightly above the glass transition temperature.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Materials Chemistry and Physics

ISSN

0254-0584

e-ISSN

1879-3312

Svazek periodika

304

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

"127833-1"-"127833-9"

Kód UT WoS článku

001000970500001

EID výsledku v databázi Scopus

2-s2.0-85159364708