The crystallization of potassium germanate glass with high content of niobium oxide
Nema prikaza
Autori
Matijašević, SrđanTosić, Mihajlo B.
Stojanović, Jovica
Grujić, Snežana R.
Živanović, Vladimir D.
Nikolić, Jelena
Đošić, Marija
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
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 > 800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T > 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 > 0.1 mm showed two exothermic peaks and two endothermic peaks with...in 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.
Ključne reči:
Niobium oxide / Germanate glass / CrystallizationIzvor:
Ceramics - Silikaty, 2012, 56, 1, 61-68Izdavač:
- University of Chemistry and Technology, Prague
Finansiranje / projekti:
- Fenomeni i procesi sinteze novih staklastih i nanostrukturnih staklo-keramičkih materijala (RS-MESTD-Basic Research (BR or ON)-172004)
- Razvoj stakala sa kontrolisanim otpuštanjem jona za primenu u poljoprivredi i medicini (RS-MESTD-Technological Development (TD or TR)-34001)
Institucija/grupa
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Matijašević, Srđan AU - Tosić, Mihajlo B. AU - Stojanović, Jovica AU - Grujić, Snežana R. AU - Živanović, Vladimir D. AU - Nikolić, Jelena AU - Đošić, Marija PY - 2012 UR - https://ritnms.itnms.ac.rs/handle/123456789/244 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 > 800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T > 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 > 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 - https://hdl.handle.net/21.15107/rcub_technorep_1981 UR - conv_1066 ER -
@article{ author = "Matijašević, Srđan and Tosić, Mihajlo B. and Stojanović, Jovica and Grujić, Snežana R. and Živanović, Vladimir D. and Nikolić, Jelena 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 > 800 degrees C. K10Nb22Ge4O68 and metastable KNbO3 and K4Nb6O17 were formed as secondary phases. The crystallization commenced at T > 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 > 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 = "https://hdl.handle.net/21.15107/rcub_technorep_1981, conv_1066" }
Matijašević, S., Tosić, M. B., Stojanović, J., Grujić, S. R., Živanović, V. D., Nikolić, J.,& 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. https://hdl.handle.net/21.15107/rcub_technorep_1981
Matijašević S, Tosić MB, Stojanović J, Grujić SR, Živanović VD, Nikolić J, Đošić M. The crystallization of potassium germanate glass with high content of niobium oxide. in Ceramics - Silikaty. 2012;56(1):61-68. https://hdl.handle.net/21.15107/rcub_technorep_1981 .
Matijašević, Srđan, Tosić, Mihajlo B., Stojanović, Jovica, Grujić, Snežana R., Živanović, Vladimir D., Nikolić, Jelena, Đošić, Marija, "The crystallization of potassium germanate glass with high content of niobium oxide" in Ceramics - Silikaty, 56, no. 1 (2012):61-68, https://hdl.handle.net/21.15107/rcub_technorep_1981 .