Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models
Апстракт
Various macrokinetic models (Avrami, Evans, Tobin, Malkin, Dietz, Nakamura, and modified first-order models) were applied to describe non-isothermal crystallization kinetics of Eu3+ doped zinc silicate powders prepared via the sol-gel method. Analysis of the experimental data was carried out using a direct-fitting method such that the experimental data were fitted directly to each macrokinetic model using a non-linear multivariable regression computation procedure. Comparison of kinetic parameters obtained from the non-linear computation approach to those obtained from the traditional analytical procedure suggested that applicability and reliability of the direct-fitting method were satisfactory. Judging from the quality of the fit, only Nakamuras model properly describe the temperature dependence of the relative crystallinity, which resulted in the total rejection of the Tobin model in describing the crystallization. With detailed kinetic examination it was concluded that crystallizat...ion mechanism of alpha-willemite doped samples combusted in a microwave oven (MW) follows interface controlled growth with an increasing nucleation rate, attached with geometric process-rate function obeying the improved (corrected) Nakamuras model. It was found that the presence of non integer Avrami exponent values may indicate that crystallization occurs by more than one reaction mechanism, including the occurrence of autocatalytic behavior of a given system. (C) 2013 Elsevier B.V. All rights reserved.
Кључне речи:
Phosphors / Crystal growth / Sol-gel processes / Kinetics / Computer simulations / Thermal analysisИзвор:
Journal of Alloys and Compounds, 2014, 587, 398-414Финансирање / пројекти:
- Материјали редуковане димензионалности за ефикасну апсорпцију светлости и конверзију енергије (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45020)
- Динамика нелинеарних физичкохемијских и биохемијских система са моделирањем и предвиђањем њихових понашања под неравнотежним условима (RS-MESTD-Basic Research (BR or ON)-172015)
DOI: 10.1016/j.jallcom.2013.10.240
ISSN: 0925-8388; 1873-4669
WoS: 000329114100064
Scopus: 2-s2.0-84888082937
Колекције
Институција/група
VinčaTY - JOUR AU - Janković, Bojan Ž. AU - Marinović-Cincović, Milena AU - Dramićanin, Miroslav PY - 2014 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5822 AB - Various macrokinetic models (Avrami, Evans, Tobin, Malkin, Dietz, Nakamura, and modified first-order models) were applied to describe non-isothermal crystallization kinetics of Eu3+ doped zinc silicate powders prepared via the sol-gel method. Analysis of the experimental data was carried out using a direct-fitting method such that the experimental data were fitted directly to each macrokinetic model using a non-linear multivariable regression computation procedure. Comparison of kinetic parameters obtained from the non-linear computation approach to those obtained from the traditional analytical procedure suggested that applicability and reliability of the direct-fitting method were satisfactory. Judging from the quality of the fit, only Nakamuras model properly describe the temperature dependence of the relative crystallinity, which resulted in the total rejection of the Tobin model in describing the crystallization. With detailed kinetic examination it was concluded that crystallization mechanism of alpha-willemite doped samples combusted in a microwave oven (MW) follows interface controlled growth with an increasing nucleation rate, attached with geometric process-rate function obeying the improved (corrected) Nakamuras model. It was found that the presence of non integer Avrami exponent values may indicate that crystallization occurs by more than one reaction mechanism, including the occurrence of autocatalytic behavior of a given system. (C) 2013 Elsevier B.V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models VL - 587 SP - 398 EP - 414 DO - 10.1016/j.jallcom.2013.10.240 ER -
@article{ author = "Janković, Bojan Ž. and Marinović-Cincović, Milena and Dramićanin, Miroslav", year = "2014", abstract = "Various macrokinetic models (Avrami, Evans, Tobin, Malkin, Dietz, Nakamura, and modified first-order models) were applied to describe non-isothermal crystallization kinetics of Eu3+ doped zinc silicate powders prepared via the sol-gel method. Analysis of the experimental data was carried out using a direct-fitting method such that the experimental data were fitted directly to each macrokinetic model using a non-linear multivariable regression computation procedure. Comparison of kinetic parameters obtained from the non-linear computation approach to those obtained from the traditional analytical procedure suggested that applicability and reliability of the direct-fitting method were satisfactory. Judging from the quality of the fit, only Nakamuras model properly describe the temperature dependence of the relative crystallinity, which resulted in the total rejection of the Tobin model in describing the crystallization. With detailed kinetic examination it was concluded that crystallization mechanism of alpha-willemite doped samples combusted in a microwave oven (MW) follows interface controlled growth with an increasing nucleation rate, attached with geometric process-rate function obeying the improved (corrected) Nakamuras model. It was found that the presence of non integer Avrami exponent values may indicate that crystallization occurs by more than one reaction mechanism, including the occurrence of autocatalytic behavior of a given system. (C) 2013 Elsevier B.V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models", volume = "587", pages = "398-414", doi = "10.1016/j.jallcom.2013.10.240" }
Janković, B. Ž., Marinović-Cincović, M.,& Dramićanin, M.. (2014). Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models. in Journal of Alloys and Compounds, 587, 398-414. https://doi.org/10.1016/j.jallcom.2013.10.240
Janković BŽ, Marinović-Cincović M, Dramićanin M. Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models. in Journal of Alloys and Compounds. 2014;587:398-414. doi:10.1016/j.jallcom.2013.10.240 .
Janković, Bojan Ž., Marinović-Cincović, Milena, Dramićanin, Miroslav, "Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models" in Journal of Alloys and Compounds, 587 (2014):398-414, https://doi.org/10.1016/j.jallcom.2013.10.240 . .