PHASE-EQUILIBRIA IN THE ZR-CU-SN SYSTEM AND CRYSTAL-STRUCTURE OF ZRCUSN AND ZRCUSN2

The isothermal section of the phase diagram of the Zr-Cu-Sn system has been constructed at 770 and 670 K. Two new ternary compounds were obt ained and their crystal structure was determined. The ZrCuSn stannide crystallizes with the TiNiSi structure type (space group Pnma, a = 6.6 279(1) Angstrom, b = 4.3679(9) Angstrom, c = 7.6791(2) Angstrom), the ZrCuSn2 structure belongs to the HfCuSi2 structure type (space group P 4/nmm, a = 4.1350(7) Angstrom, c = 9.225(3) Angstrom). Electrical resi stivity and magnetic susceptibility of these compounds have been measu red.