The Isothermal Section Of The Ce-Si-Zr And Er-Si-V Ternary System

In our work, the phase relationships in the Ce-Si-Zr ternary system at both773K and1173K and the Er-Si-V ternary system at1173K have been investigated mainly by means of powder X-ray diffraction (XRD) and scanning electron microscopy (SEM)In the Ce-Si-Zr ternary system, the existences of11binary compounds, namely Ce5Si3, Ce3Si2, Ce5Si4, CeSi, Ce3Si5, CeSi2, Zr2Si, Zr3Si2, Zr5Si4, ZrSi and ZrSi2have been confirmed. Among these, only CeSi2has a homogeneity range, from63.5%to66.7%. No ternary compounds were found in this work. The isothermal sections at773K and1173K consist of14single-phase regions,25two-phase regions, and12three-phase regions. At773K, the results show that all the phases in this system has limited homogeneity range. At1173K, the maximum solid solubility of Ce in Zr, Zr5Si4and ZrSi is about2.0at.%,5.0at.%and3.0at.%, respectively. What’s more, there are3three-phase regions containing the liquid phase L:L+Ce5Si3+Zr3Si2, L+Zr2Si+Zr3Si2and L+Zr2Si+Zr in the12three-phase regions of the isothermal sections at1173K.In the Er-Si-V ternary system, the existences of8binary compounds, namely Er5Si3, Er5Si4, ErSi, Er3Si5, Si2V, Si5V6, Si3V5and SiV3have been confirmed. No binary compound was found in the Er-V binary system. No ternary compounds were found in this wor K. In the binary systems, we confirmed the existences of Si5V6and Er3Si5at1173K. The maximum solid solubility of Si in V is about4at.%. Er3Si5has a narrow homogeneity range (from61to62.5at.%Si) while the homogeneity range of SiV3is from22to25at.%Si. No remarkable solid solubility of the elements in any of the other phases has been observed. The isothermal section consists of11single-phase regions,19two-phase regions and9three-phase regions.