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1

The microbial transformation of phosphogypsum in thermophilic anaeobic bacterial cultures

100%

Przytocka-Jusiak M., Kowalski W., Rzeczycka M., Mycielski R.

Biotechnologia

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1995

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issue 2

102-112

EN

In thermophilic anaerobic bacterial cultures phosphogypsum is microbiologically transformed to H2S, SO4(2-), Ca(2+), phosphate and calcium carbonate.The maximal received process efficiency amount to approximately 97%.The postcultivation sediments contan similar amounts of calcium, more phosphorus, more ferrum and magnesum, and smalle amounts of sulfur (mg/g of deposit) than phosphogypsum.The sediments may be applied as an agricultural fertilizer or a source of rare earths ores.

2

Magnetic Properties and Magnetocaloric Effect of DyNi_{4}Si

88%

Synoradzki K., Kowalski W., Falkowski M., Toliński T., Kowalczyk A.

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vol. 126

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issue 1

162-163

EN

The magnetic properties and magnetocaloric effect (MCE) in DyNi_{4}Si have been studied by the magnetization and specific heat measurements. The saturation magnetic moment in μ_{0}H=9 T is equal to 7.9 μ_{B}/f.u at 4.2 K. A significant MCE has been observed around the second order phase transition at T_{C}=11 K. The maximum magnetic entropy change is -Δ S_{M}=14.5 J kg^{-1}K^{-1} for the magnetic field change of 9 T.

3

Preparation and Characterisation of Fe/Ce Multilayer

64%

Dawczak-Dębicki H., Marczyńska A., Pacanowski S., Szymański B., Majchrzycki Ł., Kowalski W., Grembowski W., Bilski T., Smardz L.

Acta Physica Polonica A

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2018

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vol. 133

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issue 3

628-631

EN

Ce/Fe multilayer (ML) with constant Fe (2 nm) and Ce (4.5 nm) sublayer thicknesses was prepared onto naturally oxidised Si(100) substrate using magnetron sputtering. Chemical purity of the sublayers was revealed in-situ by X-ray photoelectron spectroscopy (XPS) measurements. The structure of the sample was studied by standard low- and high-angle X-ray diffraction (XRD). Surface morphology of the ML was examined by atomic force microscopy. Magnetic properties of the sample was studied in the temperature range between 5 and 350 K using a vibrating sample magnetometer in a magnetic field up to 9 T. The hysteresis loops were measured in field perpendicular and parallel to the substrate. Furthermore, hydrogen absorption at a pressure of about 1000 mbar was studied at room temperature (RT) in Pd covered ML using four-point resistivity measurements. The solid state amorphisation reaction have been confirmed by XRD and magnetic measurements of the Ce/Fe ML. The absence of satellite peaks in the low - angle XRD pattern revealed no artificial layered structure. The above results show that interdiffusion of cerium and iron atoms is extremely fast at RT.

4

Natural Oxidation of thin Fe Films on V Buffer Layer

52%

Dawczak-Dębicki H., Marczyńska A., Rogowska A., Wachowiak M., Nowicki M., Pacanowski S., Jabłoński B., Kowalski W., Grembowski J., Czajka R., Smardz L.

Acta Physica Polonica A

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2017

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vol. 132

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issue 4

1272-1276

EN

We have studied oxidation kinetics of Fe thin film under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are approximately nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in total Fe magnetic moment. Results show that the sample with an initial Fe thickness equal to 10 nm oxidize relatively fast (time constant τ=0.05 day), whereby a constant amount of 2.5 nm of metal is transformed into oxides. For lower iron initial thickness (d_{i}=4 nm) the time constant for oxidation significantly increases reaching a value of 2 days. Furthermore, X-ray photoelectron spectroscopy studies performed after 144 days of oxidation revealed formation of hematite (α-Fe₂O₃) thin film on the metallic rest of iron.

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The microbial transformation of phosphogypsum in thermophilic anaeobic bacterial cultures

Magnetic Properties and Magnetocaloric Effect of DyNi_{4}Si

Preparation and Characterisation of Fe/Ce Multilayer

Natural Oxidation of thin Fe Films on V Buffer Layer