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The magnetic ordering of the Tb2Ni1.78In and Tb2Ni2In have been studied by neutron diraction measurements. Tb2Ni1.78In with the tetragonal Mo2FeB2-type (space group P 4/mbm, tP 10) 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) µB is parallel to c-axis. The Tb2Ni2In in the orthorhombic Mn2 lB2-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) µB and is parallel to the c-axis.

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