The {Y, Pr}–Ag–Si systems: isothermal sections and crystal structures
Chem.
Met. Alloys 5 (2012) 103-112
https://doi.org/10.30970/cma5.0219
Igor SAVYSYUK, Oleh SHCHERBAN, Nataliya SEMUSO, Roman GLADYSHEVSKII, Evgen GLADYSHEVSKII
Isothermal sections of the phase diagrams were
constructed at 1073 and 773 K for the Pr–Ag–Si
system and at 873 K for the Y–Ag–Si system based
on X-ray powder diffraction data. The crystal structures of two ternary
compounds in the Pr–Ag–Si system were refined by the Rietveld method: PrAg2Si2, ÑeAl2Ga2-type
structure, Pearson symbol tI10, space
group I4/mmm, unit-cell parameters a =
0.42084(1), c =
1.06735(2) nm at 1073 K and CeNi2+xSb2-x-type
structure, oI10, Immm, a =
0.42088(2), b = 0.42287(2), c = 1.06695(3) nm at 773 K; PrAgSi, LiBaSi-type structure, hP3, P-6m2,
a = 0.42302(1), c = 0.41911(1) nm at 1073 K and LaPtSi-type structure, tI12,
I41md, a = 0.42087(2), c = 1.46432(8) nm at 773 K.
Homogeneity range of the
solid solution of silver in the praseodymium disilicide
Q at 1073 K. Isoconcentrates of Pr are drawn
in color as a guide for the eyes.
Keywords
Rare-earth metal /
Silver / Silicon / Phase diagram / Crystal structure / Solid solution