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The crystallization of potassium germanate glass with high content of niobium oxide

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2012
1978.pdf (1.555Mb)
Authors
Matijašević, Srđan D.
Tošić, Mihajlo B.
Stojanović, Jovica
Grujić, Snežana
Živanović, Vladimir D.
Nikolić, Jelena D.
Đošić, Marija
Article (Published version)
Metadata
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Abstract
Potassium germanate glass with molar ratio [GeO2]/[K2O] = 1.2 and Nb2O5 content of 34 mol% have been synthesized by a melt-quenching method. The crystallization behavior under non-isothermal and isothermal crystallization conditions was investigated. The results showed that this glass exposed complex primary crystallization. In the temperature range lt 800 degrees C primary phase is K3.8Nb5Ge3O20.4, while K6Nb6Ge4O26 appeared as primary phase at temperatures gt 800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T gt 640 degrees C with high homogeneous nucleation rate and spherulite crystal growth morphology. DTA curves recorded for powder samples particle size lt 0.1 mm revealed three exothermic peaks and three endothermic peaks within temperature range of T = 640-940 degrees C, while the DTA curves recorded for powder samples particle size gt 0.1 mm showed two exothermic peaks and two endothermic p...eaks within temperature range of T = 640-1020 degrees C. The analysis of the dominant crystallization mechanism of powder glass sample and kinetics of crystallization is presented.

Keywords:
Germanate glass / Niobium oxide / Crystallization
Source:
Ceramics - Silikaty, 2012, 56, 1, 61-68
Publisher:
  • University of Chemistry and Technology, Prague
Funding / projects:
  • Phenomena and processes of the synthesis of new glassy and nano-structured glass-ceramics materials (RS-172004)
  • The development of glasses with controlled ions release for application in agriculture and medicine (RS-34001)

ISSN: 0862-5468

PubMed:

WoS: 000304224600011

Scopus: 2-s2.0-84860789538
[ Google Scholar ]
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1981
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Matijašević, Srđan D.
AU  - Tošić, Mihajlo B.
AU  - Stojanović, Jovica
AU  - Grujić, Snežana
AU  - Živanović, Vladimir D.
AU  - Nikolić, Jelena D.
AU  - Đošić, Marija
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1981
AB  - Potassium germanate glass with molar ratio [GeO2]/[K2O] = 1.2 and Nb2O5 content of 34 mol% have been synthesized by a melt-quenching method. The crystallization behavior under non-isothermal and isothermal crystallization conditions was investigated. The results showed that this glass exposed complex primary crystallization. In the temperature range  lt  800 degrees C primary phase is K3.8Nb5Ge3O20.4, while K6Nb6Ge4O26 appeared as primary phase at temperatures  gt  800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T  gt  640 degrees C with high homogeneous nucleation rate and spherulite crystal growth morphology. DTA curves recorded for powder samples particle size  lt  0.1 mm revealed three exothermic peaks and three endothermic peaks within temperature range of T = 640-940 degrees C, while the DTA curves recorded for powder samples particle size  gt  0.1 mm showed two exothermic peaks and two endothermic peaks within temperature range of T = 640-1020 degrees C. The analysis of the dominant crystallization mechanism of powder glass sample and kinetics of crystallization is presented.
PB  - University of Chemistry and Technology, Prague
T2  - Ceramics - Silikaty
T1  - The crystallization of potassium germanate glass with high content of niobium oxide
EP  - 68
IS  - 1
SP  - 61
VL  - 56
UR  - conv_6645
ER  - 
@article{
author = "Matijašević, Srđan D. and Tošić, Mihajlo B. and Stojanović, Jovica and Grujić, Snežana and Živanović, Vladimir D. and Nikolić, Jelena D. and Đošić, Marija",
year = "2012",
abstract = "Potassium germanate glass with molar ratio [GeO2]/[K2O] = 1.2 and Nb2O5 content of 34 mol% have been synthesized by a melt-quenching method. The crystallization behavior under non-isothermal and isothermal crystallization conditions was investigated. The results showed that this glass exposed complex primary crystallization. In the temperature range  lt  800 degrees C primary phase is K3.8Nb5Ge3O20.4, while K6Nb6Ge4O26 appeared as primary phase at temperatures  gt  800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T  gt  640 degrees C with high homogeneous nucleation rate and spherulite crystal growth morphology. DTA curves recorded for powder samples particle size  lt  0.1 mm revealed three exothermic peaks and three endothermic peaks within temperature range of T = 640-940 degrees C, while the DTA curves recorded for powder samples particle size  gt  0.1 mm showed two exothermic peaks and two endothermic peaks within temperature range of T = 640-1020 degrees C. The analysis of the dominant crystallization mechanism of powder glass sample and kinetics of crystallization is presented.",
publisher = "University of Chemistry and Technology, Prague",
journal = "Ceramics - Silikaty",
title = "The crystallization of potassium germanate glass with high content of niobium oxide",
pages = "68-61",
number = "1",
volume = "56",
url = "conv_6645"
}
Matijašević, S. D., Tošić, M. B., Stojanović, J., Grujić, S., Živanović, V. D., Nikolić, J. D.,& Đošić, M.. (2012). The crystallization of potassium germanate glass with high content of niobium oxide. in Ceramics - Silikaty
University of Chemistry and Technology, Prague., 56(1), 61-68.
conv_6645
Matijašević SD, Tošić MB, Stojanović J, Grujić S, Živanović VD, Nikolić JD, Đošić M. The crystallization of potassium germanate glass with high content of niobium oxide. in Ceramics - Silikaty. 2012;56(1):61-68.
conv_6645 .
Matijašević, Srđan D., Tošić, Mihajlo B., Stojanović, Jovica, Grujić, Snežana, Živanović, Vladimir D., Nikolić, Jelena D., Đošić, Marija, "The crystallization of potassium germanate glass with high content of niobium oxide" in Ceramics - Silikaty, 56, no. 1 (2012):61-68,
conv_6645 .

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