Pregled bibliografske jedinice broj: 192627
MAGNETSKO PRAĆENJE POSTUPKA DISPROPORCIONIRANJA U Sm-Fe MATERIJALIMA
MAGNETSKO PRAĆENJE POSTUPKA DISPROPORCIONIRANJA U Sm-Fe MATERIJALIMA // Knjiga sažetaka = Book of abstracts / XIX. hrvatski skup kemičara i kemijskih inženjera / Rapić, Vladimir ; Rogošić, Marko (ur.).
Zagreb: Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI) ; Hrvatsko kemijsko drustvo, 2005. str. 385-385 (poster, domaća recenzija, sažetak, znanstveni)
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Naslov
MAGNETSKO PRAĆENJE POSTUPKA DISPROPORCIONIRANJA U Sm-Fe MATERIJALIMA
(MAGNETIC MONITORING OF THE DISPROPORTIONATION BEHAVIOR IN Sm-Fe-BASED MATERIALS)
Autori
Žužek Rožman, Kristina ; McGuiness, Paul ; Podmiljšak, Benjamin ; Rajić Linarić, Maša ; Kobe, Spomenka
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Knjiga sažetaka = Book of abstracts / XIX. hrvatski skup kemičara i kemijskih inženjera
/ Rapić, Vladimir ; Rogošić, Marko - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI) ; Hrvatsko kemijsko drustvo, 2005, 385-385
Skup
XIX. hrvatski skup kemičara i kemijskih inženjera
Mjesto i datum
Opatija, Hrvatska, 24.04.2005. - 27.04.2005
Vrsta sudjelovanja
Poster
Vrsta recenzije
Domaća recenzija
Ključne riječi
MAGNETSKO PRAĆENJE; DISPROPORCIONIRANJE; Sm-Fe MATERIJALIMA
(MAGNETIC MONITORING; DISPROPORTIONATION BEHAVIOR; Sm– Fe-BASED MATERIALS)
Sažetak
Despite its use in hard-magnetic processing the HDDR process has not been thoroughly investigated in terms of its phase-transformation kinetics. Two Sm– -Fe-based alloys, with compositions Sm13.7Fe86.3 and Sm13.8Fe82.2Ta4.0, were investigated in order to determine their disproportionation reaction kinetics. The alloys were first heated in hydrogen at a rate of 4º ; C/min to a temperature where the disproportionation reaction starts. At this onset temperature, which is different for the individual material, the alloy begins to decompose into a rare-earth hydride and alpha Fe. The alloys were held at this temperature until the reaction was complete. The monitoring of the disproportionation reaction was preformed using a conventional VSM modified with a high-temperature gas system. The disproportionation behavior of the systems can be explained in terms of the Johnson- Mehl- Avrami- Kolmogorov (JMAK) theory of phase transformations. The ternary alloy with satisfies the JMA conditions, and has Avrami constants of  0.5, which implies diffusion-controlled one-dimensional growth, i.e. the thickening of particles with an appreciable initial volume. On the other hand, the growth of newly formed iron phase in the binary alloy can be only explained in terms of mixed-transformation process involving one-dimensional and two-dimensional growth.
Izvorni jezik
Hrvatski
Znanstvena područja
Kemija
POVEZANOST RADA
