Abstract
Investigations were made by neutron diffraction experiments on the Zr 6CoAs 2-type (space group P6 b2 m no. 189) Tb 6FeBi 2 compound. Below T C1 = 250(5) K the magnetic structure of Tb 6FeBi 2 consists of Tb ferromagnetic (0 0 1) layers ( μ Tb = 8.0(3) μ B at 70 K). Below T C2 = 60(5) K the Tb 6FeBi 2 has an incommensurate magnetic structure with a constant propagation vector [0, 0, 0.350(1)]. The propagation vector coincides with the c axis. The magnetic moment of the Tb atoms makes an angle with the c axis ( μ Tb = 8.9(3) μ B, μ Tb = 6.2(4)° at 26 K).
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