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X-ray diffraction (XRD) and M\"ossbauer spectroscopy techniques combined with theoretical calculations based on the Korringa-Kohn-Rostoker (KKR) electronic structure calculation method were used to investigate \sigma-phase Fe_{100-x}Re_{x}…

Materials Science · Physics 2014-09-18 J. Cieslak , S. M. Dubiel , J. Zukrowski , J. Tobola

The electronic structure of $\sigma$-phase Fe$_{100-x}$V$_x$ compounds with 33.3 $\le x \le 60.0$ was calculated from the charge self-consistent Korringa-Kohn-Rostoker method. For the first time, charge densities $\rho_A(0)$ and electric…

Materials Science · Physics 2015-05-14 J. Cieslak , J. Tobola , S. M. Dubiel

Structural (lattice parameters and sublattice occupancies) and electronic (charge-density and electric field gradient) properties in a series of compounds mu-Fe_(100-x)Mo_x were studied experimentally (X-ray diffraction and Mossbauer…

Strongly Correlated Electrons · Physics 2014-08-06 J. Cieslak , J. Przewoznik , S. M. Dubiel

Quaternary Heusler alloys Co$_2$Cr$_{1-x}$Fe$_{x}$Al with varying Cr to Fe ratio $x$ were investigated experimentally and theoretically. The electronic structure and spectroscopic properties were calculated using the full relativistic…

Formation energy of the \sigma-phase in the Fe-V alloy system, \Delta E, was computed in the full compositional range of its occurrence (34 < x < 60) using the electronic band structure calculations by means of the KKR method. \Delta…

Materials Science · Physics 2015-06-05 J. Cieslak , J. Tobola , S. M. Dubiel

In the framework of density functional theory, the structural and magnetic properties of Fe$_{100-x}$Al$_x$ alloys (${5 \leq x \leq 25}$~at.\%) with the different structural order are investigated. Using the Korringa-Kohn-Rostoker Green's…

A review is presented on physical properties of the sigma-phase in Fe-Cr and Fe-V alloy systems as revealed both with experimental -- mostly with the Mossbauer spectroscopy -- and theoretical methods. In particular, the following questions…

Materials Science · Physics 2012-01-06 Stanislaw M Dubiel , Jakub Cieslak

Electronic structure Korringa-Kohn-Rostoker calculations for the $\sigma$-phase in Fe$_{100-x}$V$_x$ were performed in compositional range of its occurance ($\sim 34 \le x \le \sim 65$). Fe and V magnetic moments and hyperfine fields were…

Strongly Correlated Electrons · Physics 2012-01-06 Jakub Cieslak , Janusz Tobola , Stanislaw M. Dubiel

We present first principles charge- and spin-selfconsistent electronic structure computations on the Heusler-type disordered alloys Fe$_{3-x}$V$_{x}$X for three different metalloids X=(Si, Ga and Al). In these calculations we use the…

Materials Science · Physics 2009-10-31 A. Bansil , S. Kaprzyk , P. E. Mijnarends , J. Toboła

We investigate the microwave spectra of ultracold alkali metal dimers in magnetic, electric and combined fields, taking account of the hyperfine structure due to the nuclear spins. We consider the molecules 41K87Rb and 7Li133Cs, which are…

Chemical Physics · Physics 2015-05-14 Hong Ran , J. Aldegunde , Jeremy M. Hutson

The structural and magnetic properties of Fe$_{1-x}$Ni$_x$~($x$ = 0.32, 0.36, 0.40, 0.50) alloys have been investigated using synchrotron based x-ray diffraction (XRD) technique with x-rays of wavelength 0.63658 \AA\ down to 50 K…

Y-type hexaferrite samples Ba2ZnxCo2-xFe12O22 with x = 0, 1 and 2 were prepared from precursors synthesized by the citrate sol-gel auto combustion method. The powders were sintered at 1100{\deg} C for four hours. X-ray diffraction, scanning…

Materials Science · Physics 2017-07-31 M. A. Awawdeh , R. N. Al-Bashaireh , A-F. Lehlooh , S. H. Mahmood

Neutron diffraction technique was used to study distribution of Co and Cr atoms over different lattice sites as well as lattice paramaters in sigma-phase Co100-xCrx compounds with x = 57.0, 62.7 and 65.8. From the diffractograms recorded in…

Materials Science · Physics 2012-04-18 Jakub Cieslak , Stanislaw M. Dubiel , Michael Reissner

Magnetic properties of a $\sigma-$Fe$_{16}$Cr$_{14}$ alloy calculated with the charge and spin self- consistent Korringa-Kohn-Rostoker (KKR) and combined with coherent potential approximation (KKR-CPA) methods are reported. Non-magnetic…

Materials Science · Physics 2015-05-20 J. Cieslak , J. Tobola , S. M. Dubiel , W. Sikora

A single-crystal sample of a DO3-ordered Fe3Si compound was studied by means of the 57Fe M\"ossbauer spectroscopy. Spectra have been recorded in a transmission geometry in the temperature range between 5 and 850 K. They have been analyzed…

Strongly Correlated Electrons · Physics 2020-01-09 S. M. Dubiel , J. Żukrowski

The structural, electronic, mechanical and thermal properties of Ir$_{1-x}$Rh$_{x}$ alloys were studied systematically using ab initio density functional theory at different concentrations (x = 0.00, 0.25, 0.50, 0.75, 1.00). A Special…

Materials Science · Physics 2015-06-15 S. Ahmed , M. Zafar , M. Shakil , M. A. Choudhary

Electronic structure calculations, using the charge and spin self-consistent Korringa- Kohn-Rostoker (KKR) method, have been performed for several $R$Mn$X$ compounds ($R$ = Mg, Ca, Sr, Ba, Y; $X$ = Si, Ge) of the CeFeSi-type structure. The…

Materials Science · Physics 2009-11-10 V. Klosek , J. Tobola , A. Verniere , S. Kaprzyk , B. Malaman

We present calculations of the hyperfine coupling constants for all the heteronuclear alkali-metal diatomic molecules at the equilibrium geometry of the electronic ground state. These constants are important in developing methods to control…

Atomic Physics · Physics 2017-11-01 J. Aldegunde , J. M. Hutson

Static and dynamic magnetic properties of a ferrimagnetic [Fe(35A)/Gd(50A)]x12 superlattice were investigated in a wide 4-300 K temperature range using magneto-optical Kerr effect (MOKE) and ferromagnetic resonance (FMR) techniques. The…

Experimental investigation as well as theoretical calculations, of the Fe-partial phonon density-of-states (DOS) for nominally Fe_52.5Cr_47.5 alloy having (a) alpha- and (b) sigma-phase structure were carried out. The former at sector 3-ID…

Materials Science · Physics 2015-05-14 S. M. Dubiel , J. Cieslak , W. Sturhahn , M. Sternik , P. Piekarz , S. Stankov , K. Parlinski
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