Interaction between the components in the {Zr, Hf}-Ag-Sn ternary systems

Chem. Met. Alloys 4 (2011) 234-242

https://doi.org/10.30970/cma4.0197

N. MELNYCHENKO-KOBLYUK, V.V. ROMAKA, L. ROMAKA, Yu. STADNYK

The phase equilibria in the Zr–Ag–Sn and Hf–Ag–Sn ternary systems at 770 K and 870 K, respectively, were studied by means of X-ray diffraction and metallographic analysis over the whole concentration range. At the temperatures of the investigations the presence of ternary phases was observed neither in the Zr–Ag–Sn, nor in the Hf–Ag–Sn system. Significant solid solutions based on the Zr₅Sn₄ and Hf₅Sn₄ binaries (Ti₅Ga₄ type, space group P6₃/mcm) were found in both the investigated systems. The limiting compositions of the solid solutions (Zr₅AgSn₃ and Hf₅AgSn₃) are considered as compounds with Hf₅CuSn₃ structure type. The regions of existence and the cell parameters of the Zr₅Ag_xSn_4-x and Hf₅Ag_xSn_4-x (x = 0.0-1.0) solid solutions were determined using EMPA and X-ray powder diffraction.

Isothermal section of the phase diagram of the Hf–Ag–Sn system at 870 K.

Keywords

Stannides / Phase diagrams / Solid solution / X-ray diffraction / EPMA