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Hyperfine interactions in x-Bi0.95Dy0.05FeO3-(1-x)-Pb(Fe2/3W1/3)O3 multiferroics

100%

Zachariasz P. , Stoch A. , Stoch P. , Maurin J.

2013

tom Vol. 58, No. 1

53-56

The complex perovskite system xźBi0.95Dy0.05FeO3-(1 - x)źPb(Fe2/3W1/3)O3 was synthesized by the solid-state reaction method and was studied by means of Mössbauer spectroscopy. For different Dy-doped bismuth ferrite (BDF) contents (x = 0.1, 0.3, 0.5, 0.7) the formation of single-phase sinters was confirmed using an X-ray diffraction technique. The random distributions of Fe/W cations in crystallographic structures have been proved. A monotonically, saturation- like increase of Néel temperatures with growing BDF contribution was confirmed, and a straightforward dependence between TN temperatures and the mean hyperfine magnetic fields at Fe nuclei was shown.

Swieto zaglebiowskich pszczelarzy

100%

Zachariasz P.

nr 2

30-31

Miejsce pszczoly miodnej w srodowisku naturalnym

87%

Zachariasz P.

nr 2

Mössbauer spectroscopy study of 60P2O5-40Fe2O3 glass

75%

Stoch P. , Ciecińska M. , Zachariasz P. , Suwalski J. , Górski L. , Wójcik T.

2013

tom Vol. 58, No. 1

63-66

A 57Fe Mössbauer spectroscopy study is presented. The main goal of the research was to investigate the structural information of the glass-like the coordination numbers and redox ratio of the iron. Most of the iron, about 80%, is present in the glass as Fe3+, which is composed of tetrahedral (57%) and octahedral (23%) coordinated iron. The rest of the iron, about 20%, is in the oxidation state Fe2+. This iron could be mostly present as VIFe2+, but five-fold coordinated iron is also possible. Finally, the structural model of the synthesized 60P2O5-40Fe2O3 glass was proposed.

Hyperfine interactions in Dy(Co0.4-xNixFe0.6)2 compounds at 295 K

75%

Zwoźniak A. , Krawczyk A. , Stoch P. , Guzdek P. , Zachariasz P. , Suwalski J. , Pszczoła J.

2013

tom Vol. 58, No. 1

179-181

57Fe Mössbauer effect studies were performed for the cubic C15, Fd3m, MgCu2-type Dy(Co0.4-xNixFe0.6)2 intermetallics. Hyperfine interaction parameters : isomer shift, magnetic hyperfine field and quadrupole interaction parameter were obtained from the fitting procedure of the collected 57Fe Mössbauer effect spectra. As a result of Co/Ni substitution, a Slater-Pauling type curve for the average magnetic hyperfine field vs. Ni content in the Dy(Co0.4-xNixFe0.6)2 series is observed.

Hyperfine interactions in Tb0.27-xYxDy0.73Fe2 compounds at 295 K

75%

Krawczyk A. , Zwoźniak A. , Guzdek P. , Stoch P. , Zachariasz P. , Suwalski J. , Pszczoła J.

2013

tom Vol. 58, No. 1

133-135

This paper concerns the synthesis of yttrium-dilute Tb0.27-xYxDy0.73Fe2 intermetallic series with a borderline compound Tb0.27Dy0.73Fe2 known as Terfenol-D by arc melting, XRD analysis and 57Fe Mössbauer effect studies at 295 K. XRD analysis (295 K) shows that all samples crystallize in a cubic, Fd3m, MgCu2-type structure. The lattice parameter increases along with yttrium content. Mössbauer effect spectra for the Tb0.27-xYxDy0.73Fe2 series collected at 295 K consist of two subspectra due to easy direction of magnetization <111>. Hyperfine interaction parameters: isomer shift, magnetic hyperfine field and a quadrupole splitting were obtained from the fitting procedure of the spectra.