The Kinetic Peculiarities of the Nanocrystallization of Amorphous Alloys Fe84Nb2B14, which are Doped by Rare Earth Metals
Journal Title: Фізика і хімія твердого тіла - Year 2017, Vol 18, Issue 1
Abstract
The thermal stability and crystallization of the Fe82Nb2B14RE2 (RE = Y, Gd, Tb, Dy) amorphous alloys were investigated by differential scanning calorimetric (DSC) method. By X-ray diffraction (XRD) method has been established that the initial AMA have amorphous structure. The RE alloying of Fe82Nb2B14RE2 amorphous alloys increase the nanocrystallization temperatures for ~ 110 K and activation energies of crystallization for ~ 330 kJ/mol. The Avrami constant was found to be 1.86 for Fe84Nb2B14 at 703 K, 1.17 for Fe82Nb2B14Y2 at 813 K, 1.36 for Fe82Nb2B14Gd2 at 808 K, 1.76 for Fe82Nb2B14Tb2 at 808 K and 1.92 for Fe82Nb2B14Dy2 at 808 K. Two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the alloys.
Authors and Affiliations
L. Boichyshyn, M. O. Danyliak, B. Kotur, T. Mika
Electric Stimulation of Charge-Discharge Processes of Electrochemical Capacitors
The research is devoted to study the impact of charge-discharge processes in electrochemical capacitors. Nanoporous carbon material was used like electrode material , which was gotten through carbonization of raw plant m...
Transformations of Titanium (IV) Butoxide on Magnetite Surface in the Presence of Pluronic P-123
The technique of producing magnetically operated nanocomposites Fe3O4/TiO2 with high specific surface area (to 320 m2/g) was developed. A copolymer poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene g...
Mechanisms of Structure and Thermoelectric Properties of Vapor-Phase Condensates Solid Solution PbTe–Bi2Te3 on Ceramics
Based on analysis of AFM-images, presents the results of complex research the mechanisms of nucleation and growth processes, surface topology and thermoelectric properties of vapor-phase condensates PbTe-Bi2Te3, grown on...
Morphology of PbTe Crystal Surface Sputtered by Argon Plasma under Secondary Neutral Mass Spectrometry Conditions
dgman method sputtered by Ar+ plasma with ion energy of 50 – 550 eV for 5 - 50 minutes under Secondary Neutral Mass Spectrometry (SNMS) conditions. The sputtered PbTe crystal surface was found to be simultaneously both t...
Mechanical Activation of Mixtures SiO2/γ-Fe2O3 and its Impact on the Distribution of Valence Electrons
Crystalline and electronic structures of SiO2/γ-Fe2O3 mixtures have been analyzed using X-ray diffraction (XRD) and ultra-soft X-ray emission spectroscopy (USXES). The energy redistribution of Fesрd, Sisp and Op valence...