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A Model Calculation of Infrared Spectra in Cyclohexanol

100%
Nowina Konopka M., Wasiutyński T.
Acta Physica Polonica A
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1999
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vol. 96
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issue 3-4
399-407
EN
A model calculation based on semiempirical methods for the cyclohexanol molecules is presented. Energetically preferred molecular conformations and possibility of different hydrogen bond networks in the crystal are discussed. The calculated and the experimental infrared spectra are compared. The results corroborate earlier suggestions that the rich polymorphism of cyclohexanol is due to the existence of both axial and equatorial isomers in solid phases and different architecture of hydrogen bonds network.
2
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Magnetic Properties of Transition Metal Molybdates

61%
Konieczny P., Pełka R., Grzesiak-Nowak M., Szymańska A., Łasocha W., Wasiutyński T.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
250-251
EN
Two examples of transition metal molybdates were studied with the use of X-ray diffraction and DC magnetometry techniques. First compound, copper dimolybdate trihydrate CuMo_{2}O_{7}·3H_{2}O contains 2D layers. The second one is fibrillar cobalt trimolybdate octahydrate CoMo_{3}O_{10}·8H_{2}O. Both compounds exhibit paramagnetic behaviour at room temperature. However, in the first one copper ions form dimers linked by oxygen bridges, in which exchange interactions between two localized spin states occur. The second compound consists of isolated cobalt ions in the octahedral surroundings, resulting in magnetic properties deviating from the Curie law.
3
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Photo-Induced Relaxation of Magnetization in Molecular Magnet

61%
Zieliński P., Tracz P., Podgajny R., Pełka R., Bałanda M., Wasiutyński T., Sieklucka B.
Acta Physica Polonica A
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2007
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vol. 112
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issue S
S-183-S-188
EN
The experimental study of photo-induced magnetization of hybrid molecular magnet containing cobalt(II) and tungsten(V) magnetic centers bridged by 4,4'-bpy and CN^- is presented. The observed increase in magnetization rate is attributed to the defects due to inter-valence transfer between Co^{II}W^V↔ Co^{III}W^{IV}. The time evolution of magnetization is parameterized by the power law rather than exponential function.
4
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Field-Induced Slow Magnetic Relaxation in Mn₉W₆ Cluster-Based Compound

61%
Konieczny P., Pełka R., Chorazy S., Podgajny R., Sieklucka B., Wasiutyński T.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
884-886
EN
Magnetic measurements of a three-dimensional (3D) molecular magnet built of Mn₉[W(CN)₈]₆ clusters have been carried out to study its static and dynamic properties. Measurements of ac susceptibility in the presence of static magnetic field revealed slow magnetic relaxations. It was found that for the 120 Hz wave frequency the optimal static field which maximizes the imaginary component of the ac susceptibility is about 500 Oe.
5
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Magnetic Systems at Criticality: Different Signatures of Scaling

42%
Pełka R., Konieczny P., Fitta M., Czapla M., Zieliński P., Bałanda M., Wasiutyński T., Miyazaki Y., Inaba A., Pinkowicz D., Sieklucka B.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
977-989
EN
Different aspects of critical behaviour of magnetic materials are presented and discussed. The scaling ideas are shown to arise in the context of purely magnetic properties as well as in that of thermal properties as demonstrated by magnetocaloric effect or combined scaling of excess entropy and order parameter. Two non-standard approaches to scaling phenomena are described. The presented concepts are exemplified by experimental data gathered on four representatives of molecular magnets.
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