Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (04): 342-347.doi: 10.3866/PKU.WHXB19940411

• ARTICLE • Previous Articles     Next Articles

Phase Diagram of Binary Systems YbCl3-MCln(M=Li, Mg, Ca, Pb; n=1 or 2)

Zheng Chao-Gui, Huang Shou-Lin, Wang Si-Qiang   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1992-10-05 Revised:1993-02-24 Published:1994-04-15
  • Contact: Zheng Chao-Gui

Abstract:

The Phase diagrams of binary systems YbCl_3-MCl_n(M=Li, Mg, Ca, Pb; n=1 or 2) were investigated by means of DTA and X-ray diffeaction analysis. It was found that YbCl_3-LiCl systm is of peritectic type wich compound Li_3YbCl_6 and its phase transition is at 481 ℃ as well as the invariant points E (x_(YbCl_3)=0.410, 526 ℃) and P (x_(YbCl_3)=0.340, 547 ℃) YbCl_3-MgCl_2 system is of peritectic-like type with a peritectic-like line over the YbCl_3-rich region at 666 ℃ and the peritectic compound could not be specified. Its eutectic point e is (x_(YbCl_2)=0.380, 628 ℃). YbCl_3-CaCl_2 and YbCl_3-PbCl_2 systems are of simple eutectic type with eutectic points (x_(YbCl_3)=0.530, 615 ℃) and (x_(YbCl_3)=0.340, 415 ℃) respectively. An unstable compound, formed in the solid state, is PbYbCl_5 and decomposes at 392 ℃. Some rules of the phase diagram were also expolored.

Key words: Phase diagram, System, YbCl3-LiCl, YbCl3-MgCl2, YbCl3-CaCl2, YbCl3-PbCl2, Rule of phase diagram