The {Y, Pr}AgSi systems: isothermal sections and crystal structures

 

Chem. Met. Alloys 5 (2012) 103-112

 

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 PrAgSi system and at 873 K for the YAgSi system based on X-ray powder diffraction data. The crystal structures of two ternary compounds in the PrAgSi system were refined by the Rietveld method: PrAg2Si2, eAl2Ga2-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,= 0.42087(2), = 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