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1 Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

1 2003

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Phase equilibria in the {Zr, Hf}-Ag-Al systems at 500°C and crystal structure of the ternary compounds

Kotur B. Ya., Verbovytsky Yu. V.

Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

2003

Vol. 8

7--15

The phase equilibria at 500°C in the {Zr, Hf}-Ag-Al systems have been investigated in the whole concentration region. Three ternary compounds were found to occur in each of the systems: ZrAg0.32Al2.68 (AuCu3 structure type, space group Pm3m, a=0.41016(1) nm), ZrAg0.16-0.31Al1.84-1.69 (MgCu2 str. type, sp. gr. Fd3 m, a=0.75147(1)-0.75258(1) nm), Zr6Ag1.30-1.82Al5.70-5.18 (W6Fe7 str. type, sp. gr. R3 m, a=0.54017(3)-0.54072(3) nm, c=2.9021(5)-2.9055(3) nm); HfAg0.28-0.43Al1.72-1.57 (MgCu2 str. type, sp. gr. Fd 3 m, a=0.74600(2)-0.74631(3) nm), Hf6Ag0.39-1.43Al6.61-5.57 (W6Fe7 str. type, sp. gr. R3 m, a=0.53098(3)-0.53375(3) nm, c=2.9151(2)-2.9086(3) nm), Hf4Ag1.10Al1.90 (Zr4Al3str. type, sp. gr. P6, a=0.5332(1) nm, c=0.54279(7) nm). The crystal structure of these aluminides was studied using X-ray powder and single crystal diffraction data.