[PDF]    http://dx.doi.org/10.3952/physics.v54i3.2960

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 54, 199–203 (2014)


STUDY OF THE IRON ATOMS CLUSTERING IN MECHANICALLY ALLOYED Al-RICH Fe-Al MIXTURE
V. Bėčytė, K. Mažeika, and R. Juškėnas
Center for Physical Sciences and Technology, Savanorių 231, LT- 02300, Vilnius, Lithuania
E-mail: violeta.becyte@gmail.com

Received 23 October 2013; revised 5 February 2014; accepted 29 May 2014

Structural changes in Fe-Al system modified by high energy ball milling were studied using Mössbauer spectroscopy and X-ray diffraction. Pure Fe and Al powders were mixed in compositions with 0.5, 1.5 and 5 at.% Fe and milled for various times using Fritsch Pulverisette planetary mill. The formation of iron clusters was observed when the percentage of paramagnetic iron was higher than 0.5 at.%. It was found, that the arrangement of Fe atoms in iron clusters is similar to that observed in FeAln (n ≥\geq 2) intermetallic compounds.
Keywords: Mössbauer spectroscopy, ball milling, clusters, nanoparticles
PACS: 78.40.Kc, 61.66.Dk, 81.30.Bx

GELEŽIES ATOMŲ GRUPAVIMOSI Fe-Al LYDINIUOSE TYRIMAS MALANT

V. Bėčytė, K. Mažeika, R. Juškėnas
Fizinių ir technologijos mokslų centras, Vilnius, Lietuva

Nanokristaliniai geležies ir aliuminio milteliai buvo malami azoto atmosferoje rutuliniu Pulverisette malūnu. Fe atomų būsenos pokyčiai buvo stebėti Mesbauerio (Mössbauer) spektroskopijos ir Rengeno difrakcijos metodais. Pasinaudojus Mesbauerio spektroskopijos metodu gautais parametrais, įvertintas susidariusių geležies būsenų kitimas didinant malimo trukmę. Paramagnetinės geležies būsenų kitimas gali būti paaiškinamas geležies spiečių susidarymu, kai paramagnetinės geležies atomų kiekis >0,5 at.%. Atominė tvarka geležies spiečiuose turėtų būti tokia pati kaip ir FeAln (n ≥\geq 2) intermetaliniuose lydiniuose.
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