Advanced search
1 file | 1.22 MB Add to list

Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS

Author
Organization
Abstract
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. T (g) (glass transition temperature), T (x) (onset of crystallization peak temperature), T (f) (temperature of the inflection point of the crystallization peak) and T (p) (maximum of crystallization peak temperature), were determined. HT XRD experiments in the temperature interval 750-1200 A degrees C and isothermal HT XRD experiments at 932, 998 and 1200 A degrees C with 6-h holding time were also performed. Crystallization experiments at lower temperatures 932 A degrees C (YA-E) and 915 A degrees C (YA-G) were conducted to study phase development in a low-temperature region. Crystallization experiments at higher temperatures (1000, 1300 and 1500 A degrees C) with maximum holding time of 6 h were performed to study crystallization of alpha-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 A degrees C.
Keywords
yttrium-aluminate glasses, yttrium aluminium garnet, flame synthesis, thermal, CRYSTALLIZATION, NUCLEATION, FIBERS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.22 MB

Citation

Please use this url to cite or link to this publication:

MLA
Prnová, Anna et al. “Thermal Behaviour of Yttrium Aluminate Glasses Studied by DSC, High-temperature X-ray Diffraction, SEM and SEM–EDS.” JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 128.3 (2017): 1407–1415. Print.
APA
Prnová, A., Klement, R., Bodišová, K., Valúchová, J., Galusek, D., Bruneel, E., & Van Driessche, I. (2017). Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 128(3), 1407–1415.
Chicago author-date
Prnová, Anna, Robert Klement, Katarína Bodišová, Jana Valúchová, Dušan Galusek, Els Bruneel, and Isabel Van Driessche. 2017. “Thermal Behaviour of Yttrium Aluminate Glasses Studied by DSC, High-temperature X-ray Diffraction, SEM and SEM–EDS.” Journal of Thermal Analysis and Calorimetry 128 (3): 1407–1415.
Chicago author-date (all authors)
Prnová, Anna, Robert Klement, Katarína Bodišová, Jana Valúchová, Dušan Galusek, Els Bruneel, and Isabel Van Driessche. 2017. “Thermal Behaviour of Yttrium Aluminate Glasses Studied by DSC, High-temperature X-ray Diffraction, SEM and SEM–EDS.” Journal of Thermal Analysis and Calorimetry 128 (3): 1407–1415.
Vancouver
1.
Prnová A, Klement R, Bodišová K, Valúchová J, Galusek D, Bruneel E, et al. Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. 2017;128(3):1407–15.
IEEE
[1]
A. Prnová et al., “Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS,” JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, vol. 128, no. 3, pp. 1407–1415, 2017.
@article{8503125,
  abstract     = {{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. T (g) (glass transition temperature), T (x) (onset of crystallization peak temperature), T (f) (temperature of the inflection point of the crystallization peak) and T (p) (maximum of crystallization peak temperature), were determined. HT XRD experiments in the temperature interval 750-1200 A degrees C and isothermal HT XRD experiments at 932, 998 and 1200 A degrees C with 6-h holding time were also performed. Crystallization experiments at lower temperatures 932 A degrees C (YA-E) and 915 A degrees C (YA-G) were conducted to study phase development in a low-temperature region. Crystallization experiments at higher temperatures (1000, 1300 and 1500 A degrees C) with maximum holding time of 6 h were performed to study crystallization of alpha-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 A degrees C.}},
  author       = {{Prnová, Anna and Klement, Robert and Bodišová, Katarína and Valúchová, Jana and Galusek, Dušan and Bruneel, Els and Van Driessche, Isabel}},
  issn         = {{1388-6150}},
  journal      = {{JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY}},
  keywords     = {{yttrium-aluminate glasses,yttrium aluminium garnet,flame synthesis,thermal,CRYSTALLIZATION,NUCLEATION,FIBERS}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{1407--1415}},
  title        = {{Thermal behaviour of yttrium aluminate glasses studied by DSC, high-temperature X-ray diffraction, SEM and SEM–EDS}},
  url          = {{http://dx.doi.org/10.1007/s10973-016-6078-2}},
  volume       = {{128}},
  year         = {{2017}},
}

Altmetric
View in Altmetric
Web of Science
Times cited: