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1
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Structural Phase Transition in CeCuAl_{3} Single Crystal

100%
Klicpera M., Javorský P., Daniš S., Brunátová T.
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vol. 126
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issue 1
290-291
EN
The high temperature properties of CeCuAl_{3} single crystal were investigated by differential scanning calorimetry and high-temperature x-ray diffraction. The structural phase transition takes place around 300 °C. The phase transition changes the structural parameters only, the tetragonal BaNiSn_{3}-type structure is preserved. The significant changes of lattice parameters and especially atomic fraction coordinates with this transition are discussed with respect to the number of heating/cooling cycles and stability in time. Magnetic properties of as-cast and annealed sample are shown for comparison.
2
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Structural Phase Transition in CePd₂Ga₂ under Hydrostatic Pressure

100%
Doležal P., Klicpera M., Prchal J., Javorský P.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
219-221
EN
The structural phase transition from tetragonal to triclinic structure in CePd₂Ga₂ compound was studied by means of electrical resistivity measurement under hydrostatic pressure. The shift of the transition to the higher temperature with increasing pressure was revealed: 195 K in 3 GPa compared to 125 K in ambient pressure.
3
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Macroscopic and Microscopic Study of a CePdIn Compound

100%
Klicpera M., Javorský P., Puente-Orench I., Hoser A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
970-972
EN
The magnetization and electrical resistivity measurements on a CePdIn single crystal as well as its preparation and structural characterization are presented. The negative paramagnetic Curie temperatures indicate antiferromagnetic ground state, the anisotropy of the paramagnetic Curie temperature amounts 22.7 K. No ferromagnetic correlations were indicated. Powder neutron diffraction experiment performed at temperatures down to 0.4 K did not lead to observation of any magnetic peak in diffraction patterns. We estimate the magnetic moment on Ce atoms to be significantly lower than 0.5 μ_{B}. The temperature development of lattice parameters documents the standard thermal expansion of the unit cell; no signs of structural phase transition were observed.
4
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Magnetocaloric Effect of the Tb_{1-x}Y_{x}NiAl and TbNiAl_{1-y}In_{y} Series

100%
Kaštil J., Javorský P., Klicpera M.
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issue 5
888-890
EN
We have studied the development of the magnetocaloric effect in the (Tb,Y)NiAl and TbNi(Al,In) series as determined from magnetization measurements. The transition from antiferromagnetic order in TbNiAl to ferromagnetic order in Tb_{0.7}Y_{0.3}NiAl is accompanied by increase of the maximum entropy change from - 4.1 to - 4.4 J kg^{-1} K^{-1}. In the TbNi(Al,In) series, the change of uniaxial anisotropy in TbNiAl to the easy-plane anisotropy in TbNiIn leads to broadening of the magnetocaloric effect accompanied with large increase of the relative cooling power from 66 to 120 J kg^{-1}.
5
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Transition from Mixed-Valence to Trivalent Cerium State in Ce(Ni,Cu)Al Series

100%
Čermák P., Javorský P., Šantavá E.
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issue 5
926-928
EN
In this work we present the study of the part of Ce(Ni,Cu)Al series from the pure CeNiAl to 30% of copper concentration, which illustrates the transition from mixed-valence state of CeNiAl to the trivalent state in CeCuAl. The work is based on X-ray diffraction, magnetization and specific heat measurement. The results indicate smooth transition between the mixed-valence and trivalent cerium state. The specific-heat data reveal increase of the Sommerfeld γ coefficient with copper concentration.
6
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Isostructural Transition in RTAl Compounds at High Temperatures

100%
Prchal J., Javorský P., de Boer F., Moleman A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
335-338
EN
Based on previously discovered forbidden values of the c/a ratio, we studied anomalies in the temperature evolution of the lattice parameters (a, c) of several hexagonal RTAl compounds at high temperatures (above room temperature). The compound ErNi_{0.45}Cu_{0.55}Al, that seemed to be impossible to be prepared in single-phase form, reaches the single-phase state at temperatures above 493 K (220°C). On the other hand, the compound TbNi_{0.7}Cu_{0.3}Al - that was expected to undergo a first-order structural phase transition at high temperatures - exhibits a second-order type transition when approaching the critical values of the c/a ratio. These results are in agreement with idea of a forbidden range of c/a values in these compounds.
7
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Magnetic Phase Transitions in TbNi(Al,In) Compounds

100%
Klicpera M., Javorský P., Šantavá E.
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issue 5
881-883
EN
The magnetic phase transitions in TbNiAl_{1-x}In_{x} compounds were investigated by ac-susceptibility measurements. Our data reveal magnetic ordering with transition temperatures between 40 and 70 K, depending on the In concentration. All the studied compounds exhibit two or more phase transitions accompanied by distinct anomalies in the real and imaginary part of the ac-susceptibility. The paramagnetic Curie temperatures remain positive in the whole series.
8
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Structural and Magnetic Properties of the PrNi_{1-x}Cu_{x}Al Series

100%
Fikáček J., Javorský P., Klicpera M., Šantavá E.
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issue 5
884-885
EN
Polycrystalline samples of PrNi_{1-x}Cu_{x}Al series were studied by X-ray diffraction, magnetization and specific heat. The hexagonal ZrNiAl-type structure is preserved in the whole series. Compounds with x up to 0.4 order antiferromagnetically with the Néel temperatures between 3 and 5 K. The rest of the compounds (x = 0.5-0.9) exhibits a transition into a spin glass state below the freezing temperatures around 4 K. The analysis of the specific heat data reveals a quasi-doublet ground state well separated from higher crystal field levels in the whole series.
9
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Magnetocaloric Effect in Materials with the First Order Transitions - Direct Measurements

88%
Kamarád J., Kaštil J., Arnold Z., Javorský P., Sechovský V.
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issue 5
1000-1001
EN
The results of direct measurements of the magneto-caloric characteristics Δ T_{ad} and the indirect determination of Δ S_{m} of pure Gd around the Curie temperature and of the FeMnP_{0.45}As_{0.55} and Ni_{45}Co_5Mn_{31}Ga_{19} intermetallics in the vicinity of the first order magnetic and structural phase transitions are presented and discussed. A pronounced temperature and field dependence of the first order transitions in the studied materials manifests restrictions applying these materials in magnetic refrigeration techniques. An effective use of the Ericsson and the Brayton refrigeration cycles with FeMnP_{0.45}As_{0.55} in the role of a refrigerant is discussed.
10
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Lattice Heat Capacity in RTAl (R = Y, Lu;T = Ni, Cu, Pd) Compounds

88%
Daniel P., Javorský P., Prchal J., Daniš S., Šantavá E.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
331-334
EN
We present analysis of the specific heat of the RTAl (R = Y, Lu;T = Cu, Ni, Pd) compounds. We focus on the lattice contribution and analyze the dependence of all the characteristic parameters in the Debye and Einstein models on the atomic masses and interatomic distances.
11
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Magnetic Order in TbPdIn

88%
Javorský P., Fikáček J., Prokleška J., Nishigori S., McIntyre G.
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issue 5
879-880
EN
The magnetic structure in TbPdIn was investigated by neutron diffraction experiments. The results reveal a long-range magnetic structure with propagation vector (0,0,0) and the Tb moments forming a non-collinear structure within the basal plane that is unchanged over the whole temperature region below the ordering temperature of 66 K.
12
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Pressure Influence on Magnetic Properties of TbNiAl

88%
Javorský P., Prchal J., Klicpera M., Kaštil J., Míšek M.
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vol. 126
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issue 1
280-281
EN
We have investigated the effect of hydrostatic pressure on magnetic properties of TbNiAl, crystallizing in hexagonal ZrNiAl-type structure. TbNiAl orders antiferromagnetically below T_{N}=45 K and undergoes further magnetic phase transition to another AF phase at T_{1}=23 K. The magnetic field of B_{c} ≅ 0.3 T applied along the c-axis at 2 K leads to the transition to ferromagnetic order. By applying the hydrostatic pressure, both T_{N} and T_{1} remain almost unaffected whereas B_{c} shows a strong increase. The hydrostatic pressure stabilizes the antiferromagnetic state which can be related to development of structural parameters.
13
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Content available

Limited genetic diversity of Aerococcus viridans strains isolated from clinical and subclinical cases of bovine mastitis in Slovakia

76%
Vasil M., Špaková T., Elečko J., Legáth J., Pristaš P., Javorský P.
Polish Journal of Veterinary Sciences
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2012
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issue 2
14
Content available remote

Magnetic Charcoal Supporting Silver as a Water Disinfectant

76%
Valušová E., Antalík M., Pristaš P., Javorský P., Kováč J., Timko M.
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vol. 126
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issue 1
226-227
EN
We investigated the magnetic behavior of charcoal composite with incorporated magnetite and silver ions. The magnetization curve measured at 282 K showed saturation magnetization of 8 emu/g. By benefiting from a mechanical process, the magnetic activated carbon, supporting silver ions (MCAG), acts as a magnetic filter uptaking the bacteria. This idea was confirmed by the DGGE analysis in which the bacterial DNA was detectable in the sediment after the treatment.
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