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Structure and Magnetic Properties of Iron/Iron-Oxide Nanoparticles Prepared by Precipitation from Solid State Solution

100%
Milkovič O., Gamcová J., Sopko M., Škorvánek I.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
747-749
EN
The influence of precipitation temperature on structural and magnetic properties of iron/iron-oxide nanoparticles is investigated. Nanoparticles were prepared by precipitation of γ-Fe precipitates in Cu-Fe solid solution and subsequently isolated by matrix dissolution. Precipitation annealing temperatures were 773, 873, and 973 K. Nanoparticles core-shell structure and morphology were characterized by X-ray diffraction, high-resolution transmission electron microscopy, and selected area electron diffraction. These measurements showed that average diameter of nanoparticles increases with precipitation temperature from 8.5 nm to 20.5 nm. The measurements of magnetization as a function of temperature and applied field have been performed by SQUID magnetometer in temperature range from 5 K to 200 K.
2
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The Structural Characterization of Ni-Ti-Zr Metallic Glass

64%
Katuna Y., Lisnichuk M., Saksl K., Girman V., Gamcová J., Balga D., Ďurišin M., Kováč J., Sovák P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
750-752
EN
Metallic glasses, in contrast to its crystalline counterparts, exhibit unique mechanical and structural properties, which make them attractive for practical applications. Especially Ni-Ti-Zr metallic glass is a promising alloy for micromechanical systems because of its known shape memory properties. Shape memory effect is connected with structural phase transformation. In this paper, the ambient-temperature-structure of Ni-Ti-Zr metallic glass is investigated using transmission electron microscopy and synchrotron X-ray diffraction, the surface and chemical analysis is documented using scanning electron microscopy. Thermal stability of the alloy has been determined using differential scanning calorimetry.
3
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The Correlation between Magnetic and Structural Properties in Ni-Ti-Zr Metallic Glass

64%
Lisnichuk M., Katuna Y., Saksl K., Girman V., Gamcová J., Balga D., Ďurišin M., Kováč J., Kollár P., Sovák P.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 4
741-743
EN
The Ni-Ti-Zr metallic glasses are due to their known shape memory properties promising alloys e.g. for micromechanical applications. In this paper structure and structure stability of one particular alloy Ni₆₀Ti₂₅Zr₁₅ at.% were examined by means of X-ray diffraction and transmission electron microscopy while magnetic properties were ascertained by vibrating-sample magnetometer with maximal applied field of 100 kA/m in the temperature range of 300-1073 K.
4
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Coexistence of Ferromagnetism and Superconductivity in Rapidly Quenched Ni_2NbSn Heusler Alloy

64%
Kanuch P., Ryba T., Gamcová J., Kanuchova M., Durisin M., Saksl K., Vargova Z., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1057-1059
EN
We present the study on production and structural, electric and magnetic properties of superconductive Ni₂NbSn Heusler alloy. The sample has been produced by melt-spinning method using tangential speed of copper wheel 20 m/s. Polycrystalline structure has been obtained showing single phase with B2 disorder with lattice constant a=6.1654 Å. Resistance measurement shows superconductive behavior with critical temperature close to 5 K. Magnetic measurements also exhibit diamagnetic contribution from superconductive phase. Additionally, the ferromagnetic state has been observed below 20 K, which points to the coexistence of magnetic and superconducting state.
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