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Magnetic properties and electronic structure of YxGd1-xNi5 compounds

Bajorek A., Stysiak D., Chełkowska G., Deniszczyk J., Borgieł W., Neumann M.

Materials Science Poland

2006

Vol. 24, No. 3

867--874

Measurements of the magnetic susceptibility, crystal and electronic structure for YxGd1-xNi5 (x=0.0, 0.2, 0.5, 0.8, 1.0) compounds with the CaCu5 type of crystal structure are reported. The substitution of Y for Gd atoms results in a decrease of the volume unit cell and the Curie temperature. In the paramagnetic range (300-650K) the DC susceptibility follows Curie-Weiss law for all investigated compounds. The effective moment deduced from the Curie constant decreases rapidly with Y concentration. The saturation magnetic moment for GdNi5 shows negative polarization of Ni 3d band induced by interactions with Gd 5d states. Both valence band and core level X-ray photoelectron spectra are analyzed. The presence of the satellite structure in Ni2p core level suggests the magnetic polarisation of Ni 3d states which dominate the valence band in all investigated compositions. The experimental investigations were completed with the band structure calculations. In all cases the calculations were based on KKR and KKR-CPA methods. Satisfactory agreement between the measured spectra and those obtained from the calculated electronic structure has been achieved.

Mechanical properties of human tooth approximated with overdamped oscillators

Malinowska J., Sowińska M., Borgieł W.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 1

59-67

Numerical calculations and analysis of the tension states in hard tissues of tooth are very interesting and important issues from the orthodontist's point of view. Orthodontic methods of treatment can have a dramatic effect on children's long-term dental health and facial appearance. Research done in this field shows that due to understanding mechanics of rnasticatory organ it IS possible to attain the intentional aim of therapy in shorter time and avoid to undesired complications. The behaviour of alveolodental ligament when the force was applied allows the authors to look at human tooth affected by damped harmonic oscillator. In this study, periodontograph was successfully achieved from harmonic oscillators properties.