Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5
Апстракт
Micro-composite materials based on MgH2 with the addition of a relevant amount of LaNi5 have been synthesized by reactive ball milling. The powder microstructure has been studied by a combination of X-ray diffraction and scanning electron microscopy, while the decomposition behaviour and the hydrogen release properties have been obtained by differential thermal analysis and thermo-gravimetric measurements. Both temperature scans and constant temperature isotherms have been used to this purpose. Experimental results allow identifying optimum processing condition for synthesis of material that shows the onset of hydrogen release at temperatures as low as 450 K. The decomposition kinetics has been studied by isothermal measurements which show that the whole process cannot be described by just one mechanism limiting the reaction velocity. In fact in the first decomposition step the reaction is kinetically limited by the second phase nucleation, while, for partially decomposed samples the b...ulk diffusion appears to limit the process. On the basis of the experimental results we propose a mechanism of phase transformation where a percolating network of the two phases is formed.
Извор:
Acta Physica Polonica A, 2010, 117, 5, 841-848Напомена:
- 11th Annual Conference of the Materials-Research-Society-of-Serbia (YUCOMAT 2009), Aug 31-Sep 04, 2009, Herceg Novi, Montenegro
DOI: 10.12693/APhysPolA.117.841
ISSN: 0587-4246
WoS: 000278221700027
Scopus: 2-s2.0-77952719694
Колекције
Институција/група
VinčaTY - JOUR AU - Abazović, Nadica AU - Aurora, A. AU - Contini, V. AU - Mancini, M. R. AU - Montone, A. AU - Antisari, M. Vittori PY - 2010 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6874 AB - Micro-composite materials based on MgH2 with the addition of a relevant amount of LaNi5 have been synthesized by reactive ball milling. The powder microstructure has been studied by a combination of X-ray diffraction and scanning electron microscopy, while the decomposition behaviour and the hydrogen release properties have been obtained by differential thermal analysis and thermo-gravimetric measurements. Both temperature scans and constant temperature isotherms have been used to this purpose. Experimental results allow identifying optimum processing condition for synthesis of material that shows the onset of hydrogen release at temperatures as low as 450 K. The decomposition kinetics has been studied by isothermal measurements which show that the whole process cannot be described by just one mechanism limiting the reaction velocity. In fact in the first decomposition step the reaction is kinetically limited by the second phase nucleation, while, for partially decomposed samples the bulk diffusion appears to limit the process. On the basis of the experimental results we propose a mechanism of phase transformation where a percolating network of the two phases is formed. T2 - Acta Physica Polonica A T1 - Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5 VL - 117 IS - 5 SP - 841 EP - 848 DO - 10.12693/APhysPolA.117.841 ER -
@article{ author = "Abazović, Nadica and Aurora, A. and Contini, V. and Mancini, M. R. and Montone, A. and Antisari, M. Vittori", year = "2010", abstract = "Micro-composite materials based on MgH2 with the addition of a relevant amount of LaNi5 have been synthesized by reactive ball milling. The powder microstructure has been studied by a combination of X-ray diffraction and scanning electron microscopy, while the decomposition behaviour and the hydrogen release properties have been obtained by differential thermal analysis and thermo-gravimetric measurements. Both temperature scans and constant temperature isotherms have been used to this purpose. Experimental results allow identifying optimum processing condition for synthesis of material that shows the onset of hydrogen release at temperatures as low as 450 K. The decomposition kinetics has been studied by isothermal measurements which show that the whole process cannot be described by just one mechanism limiting the reaction velocity. In fact in the first decomposition step the reaction is kinetically limited by the second phase nucleation, while, for partially decomposed samples the bulk diffusion appears to limit the process. On the basis of the experimental results we propose a mechanism of phase transformation where a percolating network of the two phases is formed.", journal = "Acta Physica Polonica A", title = "Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5", volume = "117", number = "5", pages = "841-848", doi = "10.12693/APhysPolA.117.841" }
Abazović, N., Aurora, A., Contini, V., Mancini, M. R., Montone, A.,& Antisari, M. V.. (2010). Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5. in Acta Physica Polonica A, 117(5), 841-848. https://doi.org/10.12693/APhysPolA.117.841
Abazović N, Aurora A, Contini V, Mancini MR, Montone A, Antisari MV. Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5. in Acta Physica Polonica A. 2010;117(5):841-848. doi:10.12693/APhysPolA.117.841 .
Abazović, Nadica, Aurora, A., Contini, V., Mancini, M. R., Montone, A., Antisari, M. Vittori, "Hydrogen Release and Microstructure of MgH2 Based Composite Powders Containing a Relevant Amount of LaNi5" in Acta Physica Polonica A, 117, no. 5 (2010):841-848, https://doi.org/10.12693/APhysPolA.117.841 . .