Abstract
The interaction between the components of the ternary Y–Ni–P system has been investigated by means of electron probe microanalysis, X-ray phase and structure analyses, and the isothermal section of the phase diagram at 1070 K has been constructed for the first time. Existence of the earlier reported eight ternary phosphides of yttrium and nickel was confirmed, among them seven ternaries are daltonide compounds: YNi4P2 (ZrFe4Si2-type structure), Y2Ni12P7 (Zr2Fe12P7-type structure), Y6Ni20P13 (Zr6Ni20P13-type structure), Y6Ni14.9P10.18 (own structure type), Y20Ni42P30.34 (Sm20Ni41.6P30-type structure), Y15Ni28P21 (Tb15Ni28P21-type structure), and YNiP (Tb1−xNiP-type structure), whereas YNi1.66−1.78P2 (ThCr2Si2-type structure) is a berthollide compound with small homogeneity range. The crystal structures of the some ternary phosphides have been determined by X-ray powder diffraction (YNi4P2 and YNi1.66−1.78P2) and single crystal diffraction (Y2Ni12P7) techniques.
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