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2 Acta Physica Polonica A

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Magnetic Properties RNi_5Sn (R = Pr, Nd) Compounds

100%

Tyvanchuk Y. , Romaka L. , Szytuła A. , Duraj R. , Zarzycki A.

nr 1

145-147

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.

Structural Chemistry and Magnetic Properties of R_2Ni_{2-x}In (R=Gd-Er, x=0.22 or 0.3) Compounds

86%

Tyvanchuk Y. , Baran S. , Jaworska-Gołąb T. , Duraj R. , Kalychak Y. , Szytuła A.

nr 3

678-681

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.

Neutron Diffraction Studies of Tb_2Ni_{2-x}In Intermetallic Compounds

86%

Szytuła A. , Baran S. , Hoser A. , Kalychak Y. M. , Penc B. , Tyvanchuk Y.

nr 6

994-997

The magnetic ordering of the Tb_2Ni_{1.78}In and Tb_2Ni_2In have been studied by neutron diffraction measurements. Tb_2Ni_{1.78}In with the tetragonal Mo_2FeB_2-type (space group P4/mbm, tP10) is antiferromagnet with the Néel temperature equal to 20 K. Below this temperature Tb moments form collinear magnetic structure commensurate with the crystal, described by the propagation vectors equal to (1/4, 1/4, 1/2). Magnetic moment equal to 7.60(6) μ_{B} is parallel to c-axis. The Tb_2Ni_2In in the orthorhombic Mn_2 lB_2-type (space group Cmmm, oC10) was detected as an impurity in the studied sample. It orders antiferromagnetically below ≈ 100 K with collinear moment arrangement described by the propagation vector (1/2, 1/2, 1/2). t 1.6 K μ_{Tb} = 6.33(14) μ_{B} and is parallel to the c-axis.