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1
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Magnetic Properties of RIrSi (R = Tb, Dy, and Ho) Compounds

100%
Duraj R., Szytuła A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 4
773-776
EN
The magnetic data for the polycrystalline samples of RIrSi (R = Tb, Dy and Ho) compounds are reported. These compounds are antiferromagnets with the Néel temperatures equal to 32 K (R = Tb), 7.0 K (R = Dy) and 4.8 K (R = Ho), respectively. The external magnetic field induces the one step for TbIrSi and two step for DyIrSi and HoIrSi metamagnetic phase transitions. The values of the critical field as Néel temperatures decrease with increase of the number of 4f electrons. The magnetic phase diagrams (H, T) are determined.
2
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Magnetic Properties and the Magnetic Phase Transitions in R_5Rh_4Ge_{10} (R = Tb-Tm) Compounds

100%
Duraj R., Szytuła A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 1
139-144
EN
The magnetic data for R_5Rh_4Ge_{10} (R = Tb, Dy, Ho, Er, and Tm) compounds was investigated by means of the dc magnetization and dc and ac magnetic susceptibility. At low temperature all these compounds are antiferromagnets. For these with R = Tb, Ho and Er below T_{N} the additional phase transitions are observed. The obtained data are compared with the neutron diffraction results.
3
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A.C. Susceptibility Measurements under High Pressure up to 2.0 GPa

81%
Średniawa B., Duraj R., Zach R., Guillot M.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 5
917-920
EN
A newly developed pressure setup for a.c. susceptibility measurements in the pressure range up to 2.0 GPa is presented; the temperature domain extends from 77 to 450 K. The steel pressure chamber contains the sample located at the center of a set of three compensated pick-up coils and the pressure and temperature sensors. Either alcohol or extraction naphtha is used as the liquid pressure transmitting medium. The (P,T) magnetic phase diagram of (Fe_{0.975}Ni_{0.025})_{2}P system in the pressure range up to 2.0 GPa is reported.
4
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Magnetocaloric Effect and Transition Order in HoAl

81%
Baran S., Duraj R., Szytuła A.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 3
815-817
EN
Magnetic measurements of HoAl_{2} are reported. The compound crystallizes in the cubic MgCu_{2}-type crystal structure. HoAl_{2} exhibits two successive magnetic transitions: below T_{c} = 29 K a ferromagnetic order is formed while anomaly at T_{t} = 20 K is related to reorientation of magnetic moment. Near transition temperatures a magnetocaloric effect with magnetic entropy changes -ΔS_{m} equal to 6.3 J/(mol K) at T_{c} and 5.0 J/(mol K) at T_{t} for an external field μ_{0}H = 9 T is observed.
5
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Magnetic Properties of TbFe_{0.25}Ge_2, TbSn_{0.4}Ge_{1.4} and NdSn_{0.6}Ge_{1.775} Compounds

81%
Gil A., Duraj R., Szytuła A.
Acta Physica Polonica A
|
2012
|
vol. 122
|
issue 2
394-395
EN
The magnetic data of TbFe_{0.25}Ge_2, TbSn_{0.4}Ge_{1.4} and NdSn_{0.6}Ge_{1.775} compounds are reported. These compounds crystallize in the orthorhombic crystal structures described by the space group Cmcm (No. 63) and they are antiferromagnets with the Néel temperatures equal to 19.5, 22 and 3.7 K, respectively.
6
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Magnetic Properties and Magnetic Structure of DyCoSi_2 Compound

81%
Duraj R., Penc B., Szytuła A.
|
|
vol. 125
|
issue 5
1176-1178
EN
The results of new magnetic dc and neutron diffraction measurements of DyCoSi_2 compound are presented. Below T_{N} equal to 10.9 K the Dy moments form collinear G-type structure with the moment parallel to the c-axis. The value of Dy-moment equal to 5.5(2) μ_{B} are smaller than free Dy^{3+} ion value (10.0 μ_{B}). These and the three-step magnetization process indicate the strong influence of the crystal electric field on the stability of the magnetic order. Increase of the values of the lattice parameters at 1.5 K in reference of these at 20 K indicate magnetostriction effect at low temperatures.
7
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Magnetic Properties RNi_5Sn (R = Pr, Nd) Compounds

71%
Tyvanchuk Y., Romaka L., Szytuła A., Duraj R., Zarzycki A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 1
145-147
EN
X-ray diffraction and magnetic measurements of RNi_5Sn (R = Pr, Nd) compounds are reported. These compounds crystallize in the hexagonal CeNi_5Sn-type structure. Magnetic data indicate that both compounds are antiferromagnet with the Néel temperatures T_{N} equal to 24 K (R = Pr) and 8.8 K (R = Nd). The magnetic data below T_{N} suggest the complex magnetic order.
8
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Crystal Structure and Magnetic Properties of Tb_{11}O_{20}

71%
Baran S., Duraj R., Hoser A., Penc B., Szytuła A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 1
98-100
EN
Magnetic and neutron diffraction data for Tb_{11}O_{20} compound are reported. This compound crystallizes in a triclinic crystal structure described by the space group P1 and is antiferromagnetic with the Néel temperature 5.1 K.
9
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Structural Chemistry and Magnetic Properties of R_2Ni_{2-x}In (R=Gd-Er, x=0.22 or 0.3) Compounds

62%
Tyvanchuk Y., Baran S., Jaworska-Gołąb T., Duraj R., Kalychak Y., Szytuła A.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 3
678-681
EN
X-ray diffraction and magnetic measurements of R_2Ni_{2 - x}In (R = Ho, Dy, x = 0.3 and R = Gd, Tb, Er, x = 0.22) compounds are reported. The compounds crystallize in the tetragonal Mo_2FeB_2-type crystal structure (space group P4/mbm). Magnetic measurements reveal antiferromagnetic order with the Néel temperatures T_{N} equal to 26.4 K (Gd), 20.2 K (Tb), 8.3 K (Dy), 7.1 K (Ho), and 6.3 K (Er). For R = Gd, Tb and Er an additional phase transition below T_{N} is observed at 13.5, 13.1, and 5.0 K, respectively.
10
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Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System

52%
Średniawa B., Duraj R., Pacyna A., Bombik A., Zach R., Bacmann M., Fruchart D., Nizioł S., Fornal P., Stanek J.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
921-925
EN
This report focuses on magnetoelastic properties and critical behaviour of (Fe_{1-x}Ni_{x})_{2}P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.
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