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The microbial transformation of phosphogypsum in thermophilic anaeobic bacterial cultures

100%

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

Biotechnologia

1995

nr 2

102-112

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.

Magnetic Properties and Magnetocaloric Effect of DyNi_{4}Si

88%

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

tom 126

nr 1

162-163

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.

Natural Oxidation of thin Fe Films on V Buffer Layer

51%

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

2017

tom 132

nr 4

1272-1276

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.