Aa Galkin Donetsk Institute For Physics And Engineering

Donets’k, Ukraine

Aa Galkin Donetsk Institute For Physics And Engineering

Donets’k, Ukraine
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Mezin N.I.,Aa Galkin Donetsk Institute For Physics And Engineering | Starostyuk N.Y.,Aa Galkin Donetsk Institute For Physics And Engineering | Yampolskii S.V.,Aa Galkin Donetsk Institute For Physics And Engineering
Journal of Magnetism and Magnetic Materials | Year: 2017

Preparation of a novel yttrium-iron garnet of the chemical formula Y3-xFe5+xO12, where 0.1≤x≤1.5, is reported. Epitaxial films of this garnet were grown by the liquid phase epitaxy technique from the PbO–B2O3 solution containing weakly dissociated both yttrium-iron garnet Y3Fe5O12 and yttrium orthoferrite YFeO3 as the charge materials. It has been shown that crystallization from such a solution-melt results in the clusters which contain some structural fragments of Y3Fe5O12 and YFeO3 inside the liquid phase of the growing films and crystals forming in such a way a structure of the novel ferrite. Structural and magnetic properties of the obtained garnet films are also discussed. © 2017 Elsevier B.V.


Tkatch V.I.,Aa Galkin Donetsk Institute For Physics And Engineering | Nosenko V.K.,Gv Kurdymov Institute For Metal Physics Of The Nas Of Ukraine | Moiseeva T.N.,Aa Galkin Donetsk Institute For Physics And Engineering | Rassolov S.G.,Aa Galkin Donetsk Institute For Physics And Engineering | And 3 more authors.
Journal of Non-Crystalline Solids | Year: 2015

Thermal stability, structural changes and nanocrystallization kinetics of the Fe80B14Si6 and Fe45Ni19.4Co8.5Cr5.7Mo1.9B14Si5.5 amorphous alloys under continuous heating and isothermal annealings as well as the changes of microhardness caused by the phase transitions have been experimentally studied by a combination of X-ray diffraction analysis, differential scanning calorimetry, by measurements of electrical resistance and microhardness. The partial replacement of Fe in the Fe80B14Si6 alloy by a number of transition metals results in lowering of the onset crystallization temperature, facilitating the nanocrystal forming tendency, and enhancement of the microhardness values of the samples in the non-equilibrium structural states. The temperature dependencies of effective diffusion coefficients governing nanocrystallization are determined by approximation of the experimentally measured changes of the α-Fe nanocrystal sizes and the kinetic curves of nanocrystallizationwithin the appropriate analytical models. The essentially lower thermal stability f the Fe45Ni19.4Co8.5Cr5.7Mo1.9B14Si5.5 amorphous alloy comparedwith that of Fe80B14Si6 is associated with about two orders of magnitude lower effective diffusivity at the onset crystallization temperatures. From comparison of the rates of growth of α-Fe nanocrystals and their numbers of volumedensity in nanocomposite structures, it is suggested that the thermal stability of the former amorphous alloy is limited by slow diffusion-limited growth, while that of the latter one is controlled by nucleation. © 2015 Elsevier B.V. All rights reserved.

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