Abstract
Two novel ternary intermediate phases, namely URuSi 3− x ( x=0.11) and U 3Ru 2Si 7 were found in the Si-rich part of the U –Ru –Si phase diagram. Single crystal X-ray diffraction measurements, carried out at room temperature, indicated that URuSi 3− x crystallizes in its own tetragonal type structure (space group P4/ nmm, no. 129; unit cell parameters: a=12.108(1) Å and c=9.810(1) Å), being a derivative of the BaNiSn 3-type structure. U 3Ru 2Si 7 adopts in turn a disordered orthorhombic La 3Co 2Sn 7-type structure (space group Cmmm, no. 65; unit cell parameters: a=4.063(1) Å, b=24.972(2) Å and c=4.072(1) Å). As revealed by magnetization, electrical resistivity and specific heat measurements, both compounds order magnetically at low temperatures. Namely URuSi 3− x is a ferromagnet with T C=45 K, and U 3Ru 2Si 7 shows ferrimagnetic behavior below T C=29 K.
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