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X-ray diffraction studies on eleven single crystals having compositional ratios close to Yb/(Fe,Al) = 2:17 revealed four distinctly different structures, two having hexagonal symmetry (LuFe

The isothermal cross-section of the phase diagram of the ternary Tb-Hf-Si system at 873 K was constructed. The formation of two compounds was established: Tb 2 Hf 3 Si 4 (Sc 2 Re 3 Si 4 type, P4 1 2 1 2, tP36, Z = 4; a = 0.72057(8), c = 1.3199(2) nm) and (Tb 0.7 Hf 0.3)Si (CrB type, Cmcm, oS8, Z = 4; a = 0.42241(8), b = 1.0483(2), c = 0.38227(7) nm).

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