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3 Acta Physica Polonica A

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Structure and Hyperfine Interactions in Aurivillius Bi_{9}Ti_{3}Fe_{5}O_{27} Conventionally Sintered Compound

100%

Mazurek M. , Lisińska-Czekaj A. , Surowiec Z. , Jartych E. , Czekaj D.

Acta Physica Polonica A

2011

tom 119

nr 1

72-74

The structure and hyperfine interactions in the Bi_{9}Ti_{3}Fe_{5}O_{27} Aurivillius compound were studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the conventional solid-state sintering method at various temperatures. An X-ray diffraction analysis proved that the sintered compounds formed single phases at temperature above 993 K. Mössbauer measurements have been carried out at room and liquid nitrogen temperatures. Room-temperature Mössbauer spectrum of the Bi_{9}Ti_{3}Fe_{5}O_{27} compound confirmed its paramagnetic properties. However, low temperature measurements revealed the additional paramagnetic phase besides the antiferromagnetic one.

Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

100%

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

tom 126

nr 4

975-978

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.

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

86%

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

nr 6

1545-1553

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.