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1

Structure and Hyperfine Interactions of Mechanically Activated Delafossite CuFeO₂

100%

Siedliska K., Pikula T., Oleszak D., Jartych E.

Acta Physica Polonica A

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2018

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vol. 133

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issue 3

372-375

EN

Delafossite CuFeO₂ belongs to multiferroic class of materials. In this work, copper ferrite was prepared by mechanical activation with subsequent thermal treatment. X-ray diffraction and Mössbauer spectroscopy were used as complementary methods to study the structure and hyperfine interactions of the material. As proved by X-ray diffraction, CuFeO₂ compound was obtained with relatively low amount of secondary phases like CuO and CuFe₂O₄. The Mössbauer spectroscopy revealed paramagnetic character of the compound at room temperature. The purest delafossite CuFeO₂ was obtained by mechanical activation of pre-milled precursors and sintering at 1173 K. The temperature of thermal treatment is lower by 100 K as compared to the traditional solid-state synthesis.

2

Hyperfine Interactions and Some Magnetic Properties of Nanocrystalline Co_{40}Fe_{50}Ni_{10} and Co_{50}Fe_{45}Ni_{5} Alloys Prepared by Mechanical Synthesis and Subsequently Heat Treated

100%

Pikula T., Oleszak D., Pękała M.

Acta Physica Polonica A

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2011

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vol. 119

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issue 1

52-55

EN

Co_{40}Fe_{50}Ni_{10} and Co_{50}Fe_{45}Ni_{5} ternary alloys were prepared by mechanical alloying method. To check the stability of their structure thermal treatment was applied subsequently. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc lattice and the average grain sizes ranged of tens of nanometers. After heating of the Co_{50}Fe_{45}Ni_{5} alloy up to 993 K the mixture of two solid solutions with bcc and fcc lattices was formed. In other cases thermal treatment did not change the type of the crystalline lattice. Mössbauer spectroscopy revealed hyperfine magnetic field distributions which reflected the different possible atomic surroundings of ^{57}Fe isotopes. Results of the macroscopic magnetic measurements proved that both investigated alloys had relatively good soft magnetic properties.

3

Influence of Dy Doping on the Properties of BiFeO3

88%

Dzik J., Feliksik K., Pikula T., Panek R., Rerak M.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 3

4

Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

88%

Mazurek M., Oleszak D., Pikula T., Karolus M., Jartych E.

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vol. 126

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issue 4

975-978

EN

X-ray diffraction and ^{57}Fe Mössbauer spectroscopy were applied as complementary methods to investigate the structure and hyperfine interactions of the Aurivillius compounds prepared by mechanical activation and subsequent heat treatment. Preliminary milling of precursors enhanced the diffusion process and pure Aurivillius compounds were obtained at lower temperature as compared with conventional solid-state sintering technology (lower at least by 50 K). All the investigated Aurivillius compounds are paramagnetic materials at room temperature.

5

X-Ray Diffraction, Mössbauer Spectroscopy, and Magnetoelectric Effect Studies of Multiferroic Bi₅Ti₃FeO₁₅ Ceramics

88%

Pikula T., Guzdek P., Dzik J., Lisinska-Czekaj A., Jartych E.

Acta Physica Polonica A

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2015

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vol. 127

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issue 2

296-299

EN

Bi₅Ti₃FeO₁₅ ceramics belongs to multiferroic class of materials. In this work it was prepared by solid-state sintering method and investigated by X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diffraction studies the single-phase Bi₅Ti₃FeO₁₅ compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well as at 80 K. Magnetoelectric measurements were carried out at room temperature using lock-in dynamic method and they proved presence of magnetoelectric coupling in this material. Additional magnetoelectric studies were carried out after subsequent electric poling of the sample. It was found that the maximum value of the coupling coefficient was almost twice bigger than in the case without the initial poling and reached a value of α_{ME} ≈ 20.7 mV cm⁻¹ Oe⁻¹.

6

Mössbauer Study of Mechanosynthesized and Thermally Treated Co-Fe-Ni Alloys

76%

Pikula T., Oleszak D., Pękała M., Mazurek M., Żurawicz J., Jartych E.

Acta Physica Polonica A

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2008

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vol. 114

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issue 6

1545-1553

EN

Mechanical alloying was used to prepare Co_{40}Fe_{60}, Co_{60}Fe_{35}Ni_{5}, Co_{40}Fe_{45}Ni_{15}, and Co_{40}Fe_{35}Ni_{25} alloys from the elemental powders. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc or fcc lattice and the average grain size between 20 and 50 nm. After heating of the alloys up to 993 K, the mixtures of two solid solutions with bcc and fcc lattices were formed in the case of Co-Fe-Ni alloys. Thermal treatment did not influence the type of the lattice of Co_{40}Fe_{60} alloy. The Mössbauer spectroscopy revealed hyperfine magnetic field distribution ranged from 33 to 38 T for Co_{40}Fe_{60} alloy and from 30 to 37 T for Co-Fe-Ni alloys. In the case of two-phase alloys, distributions were decomposed into two simple Gaussian functions using the numerical fitting. Magnetic measurements allowed to determine the effective magnetic moments and the Curie temperatures of the obtained alloys.

7

Towards cubic modification of Li7La3ZR2O12 compound by mechanical milling and annealing of powders

76%

Oleszak D., Kurowski B., Pikula T., Pawlyta M., Senna M., Suzuki H.

Archives of Metallurgy and Materials

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2019

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vol. 64

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issue 1

8

Synthesis and Dielectric Properties of Nd Doped Bi5Ti3FeO15 Ceramics

72%

Kocoń N., Dzik J., Szalbot D., Pikula T., Adamczyk-Habrajska M., Wodecka-Duś B., Kocoń N., Dzik J., Szalbot D., Pikula T., Adamczyk-Habrajska M., Wodecka-Duś B.

Archives of Metallurgy and Materials

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2021

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vol. 66

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issue 2

9

The Effect of Ho Doping Contents on the Structural, Microstructure and Dielectric Properties of Bi5Ti3FeO15 Aurivillius Ceramics

72%

Tomaszewska M., Dzik J., Wodecka-Duś B., Pikula T., Adamczyk-Habrajska M., Szalbot D., Chocyk D., Tomaszewska M., Dzik J., Wodecka-Duś B., Pikula T., Adamczyk-Habrajska M., Szalbot D., Chocyk D.

Archives of Metallurgy and Materials

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2021

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vol. 66

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issue 1

10

Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study

64%

Jartych E., Pikula T., Mazurek M., Franus W., Lisińska-Czekaj A., Czekaj D., Oleszak D., Surowiec Z., Aksenczuk A., Calka A.

Archives of Metallurgy and Materials

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2016

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issue 2

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Structure and Hyperfine Interactions of Mechanically Activated Delafossite CuFeO₂

Hyperfine Interactions and Some Magnetic Properties of Nanocrystalline Co_{40}Fe_{50}Ni_{10} and Co_{50}Fe_{45}Ni_{5} Alloys Prepared by Mechanical Synthesis and Subsequently Heat Treated

Influence of Dy Doping on the Properties of BiFeO3

Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

X-Ray Diffraction, Mössbauer Spectroscopy, and Magnetoelectric Effect Studies of Multiferroic Bi₅Ti₃FeO₁₅ Ceramics

Mössbauer Study of Mechanosynthesized and Thermally Treated Co-Fe-Ni Alloys

Towards cubic modification of Li7La3ZR2O12 compound by mechanical milling and annealing of powders

Synthesis and Dielectric Properties of Nd Doped Bi5Ti3FeO15 Ceramics

The Effect of Ho Doping Contents on the Structural, Microstructure and Dielectric Properties of Bi5Ti3FeO15 Aurivillius Ceramics

Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study