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Structural Characterization and Magnetic Properties of CuCr₂Te₄ Spinel Obtained by Mechanical Alloying and Heat Treatment

100%
Karolus M., Maciążek E., Panek J., Kubisztal M., Groń T.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
859-861
EN
CuCr₂Te₄ can be obtain by mechanical alloying followed by heat treatment. The obtained phase crystallizes in the spinel-type structure of the space group Fd3m. The calculated crystallite size equals to 100 nm. Magnetic susceptibility measurements showed ferrimagnetic order below 21 K.
2
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Magnetic Properties and Structure of the Ni-Co-Mn-In Alloys with the Boron Addition

100%
Prusik K., Matyja E., Kubisztal M., Zubko M., Swadźba R.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 5
1240-1243
EN
Series of Ni_{45.5-x}Co_{4.5}Mn_{36.6}In_{13.4}B_{x} (at.%, x=0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys were examined in terms of the magnetic properties, structure and transition temperatures. Depending on the boron concentration single or two phase alloys microstructures were observed. Additionally, the martensitic transformation temperatures decreases with the boron addition. Magnetic-field induced transformation occurs for the alloys with the boron addition up to 0.1 at.%. For alloys with 0.5 and 1.0 at.% of B transformation is hindered.
3
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Preparation and Magnetic Characteristics of Co_{1-δ}Zn_{δ}Fe₂O₄ Ferrite Nanopowders

100%
Kubisztal M., Herok I., Karolus M., Prusik K., Haneczok G.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1236-1239
EN
In the present paper the Co_{1-δ}Zn_{δ}Fe₂O₄ (0 ≤ δ ≤ 1) ferrite nanopowders with a spinel type structure were synthesized using a chemical co-precipitation technique with constant flow rate ν _{FR}=120 cm³/min at three different reaction temperatures i.e. T_r =50°C, 70°C and 90°C. Magnetic and structural characteristics of the obtained materials were investigated by means of X-ray diffraction method, transmission electron microscopy and vibrating sample magnetometer. In the course of studies hysteresis loops M(μ₀H) and the relations of magnetization M_{7T} (determined at μ_0H=7 T), squareness ratio S and the Néel temperature T_{N} versus Zn content were determined and discussed in detail. It was shown that for δ<0.6 the increase in reaction temperature T_r results in a significant increase of the measured magnetic characteristics. In particular, in the case of Co_{0.8}Zn_{0.2}Fe₂O₄ ferrite nanopowder magnetization M_{7T} reaches maximal value of about 80 emu/g.
4
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Effect of the Boron Addition on the Structure of the Ni-Mn-Co-In Alloys

100%
Prusik K., Matyja E., Zubko M., Kubisztal M., Chrobak A.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 4
1023-1025
EN
Series of Ni_{45.5-x}Co_{4.5}Mn_{36.6}In_{13.4}B_{x} (at.%, x=0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys produced by the induction melting were examined in terms of the structure and transition temperatures. The structure of the alloys was determined by the X-ray diffraction and transmission electron microscopy. Scanning electron microscopy and electron backscattering diffraction techniques were applied to obtain the microstructure and texture of alloys. Boron addition promotes nucleation of the second Co-rich and In-poor phase as well as causes decrease of the martensitic transformation temperatures.
5
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Synthesis and Magnetic Properties of CuCr_{1.65}Se_4 Nanoparticles

86%
Maciążek E., Panek J., Kubisztal M., Karolus M., Groń T., Duda H.
Acta Physica Polonica A
|
2014
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vol. 126
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issue 5
1137-1139
EN
CuCr_{1.65}Se_{4} nanoparticles crystallize in the monoclinic Cr_{2}Se_{3}-type structure of the space group I2/m. The average crystallite size basing on the line broadening is less than 10 nm. With decrease of the size of grains a change from ferromagnetic to ferrimagnetic order, a lack of the magnetization saturation and a strong spin-orbit coupling visible in the large value of the Landé factor g_{χ} = 2.72 are observed. The change in magnetic order is caused by the change of the crystalline symmetry from the cubic phase to monoclinic one.
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