Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F17%3APU125756" target="_blank" >RIV/00216305:26620/17:PU125756 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/s10973-016-6078-2" target="_blank" >http://dx.doi.org/10.1007/s10973-016-6078-2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10973-016-6078-2" target="_blank" >10.1007/s10973-016-6078-2</a>
Alternative languages
Result language
angličtina
Original language name
Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS
Original language description
DSC, SEM–EDS, XRD and high-temperature XRD analysis was used to study thermal and crystallization behaviour of yttrium aluminate glasses prepared in the form of microspheres. The glasses YA-E (eutectic composition from the pseudo-binary system Al2O3–Y3Al5O12) and YA-G (a composition identical to the stoichiometric Y3Al5O12 (YAG) phase) were prepared by combination of the Pechini method with flame synthesis. The resulting microspheres were largely amorphous, but contained traces of yttrium–aluminium garnet as the main crystalline phase embedded in the yttrium aluminate glass matrix. Crystallization of the YAG phase was observed as the dominant exothermic process on DSC curves. From the DSC records, the basic thermal characteristics of the matrix glass, i.e. Tg (glass transition temperature), Tx (onset of crystallization peak temperature), Tf (temperature of the inflection point of the crystallization peak) and Tp (maximum of crystallization peak temperature), were determined. HT XRD experiments in the temperature interval 750–1200 C and isothermal HT XRD experiments at 932, 998 and 1200 C with 6-h holding time were also performed. Crystallization experiments at lower temperatures 932 C (YA-E) and 915 C (YA-G) were conducted to study phase development in a low-temperature region. Crystallization experiments at higher temperatures (1000, 1300 and 1500 C) with maximum holding time of 6 h were performed to study crystallization of a-Al2O3 in the eutectic system. The SEM and SEM–EDS examination of polished cross sections of crystallized microspheres revealed slow volume crystallization of the YAG phase in the AY-E glass. Eventually, polycrystalline microspheres with fine-grained microstructure were prepared after 6-h treatment at 1500 C.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Thermal Analysis and Calorimetry
ISSN
1388-6150
e-ISSN
1588-2926
Volume of the periodical
128
Issue of the periodical within the volume
3
Country of publishing house
HU - HUNGARY
Number of pages
9
Pages from-to
1407-1415
UT code for WoS article
000401349800017
EID of the result in the Scopus database
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