The Experimental Investigation Of Phase Relationships Of The Ce-Nd-B-Fe Multicomponent Systems At 773K

The isothermal sections of Ce–Nd–B,Nd–Ce–Fe ternary system and the Ce–Nd–B–Fe quaternary system with 70 at.%Fe at 773 K,had been investigated mainly by X-ray power diffraction and scanning electron microscopy with energy disperse spectroscopy techniques.The isothermal section of the Ce–Nd–B ternary system at 773 K was established.No ternary phase was discovered.In this system,3three-phase regions:??Ce,Nd?+??Ce,Nd?+?Ce,Nd?B₄,?Ce,Nd?B₄+?Ce,Nd?₂B₅+??Ce,Nd?and?-B+NdB₆₆+?Ce,Nd?B₆ were identified.Additionally,CeB₆–NdB₆ and CeB₄–NdB₄ were found to form continuous solid solutions,termed as?Ce,Nd?B₆ and?Ce,Nd?B₄,respectively.The solubility of Ce in Nd₂B₅ was also determined.The isothermal section of Nd–Ce–Fe ternary system at 773 K was constructed.No ternary phase formed.In this system,3 three-phase regions:?Ce,Nd?₂Fe₁₇+?Ce,Nd?Fe₂+?Ce,Nd?₅Fe₁₇,?Ce,Nd?₅Fe₁₇+?Ce,Nd?Fe₂+??Ce,Nd?and??Ce,Nd?+??Ce,Nd?+?Ce,Nd?Fe₂ were identified.Additionally,Ce₂Fe₁₇7 and Nd₂Fe₁₇7 were discovered to form continuous solid solution?Ce,Nd?₂Fe₁₇.The solubilities of Ce in Nd₅Fe₁₇,Nd in CeFe₂ were also determined.The isothermal section of the Ce–Nd–B–Fe quaternary system at 773K was built.No quaternary phase was observed.In this system,2four-phase regions:?Ce,Nd?Fe₄B₄+?Ce,Nd?₂Fe₁₄B+?Ce,Nd?Fe₂+??Ce,Nd?and?Ce,Nd?₅Fe₁₇+?Ce,Nd?₂Fe₁₄B+?Ce,Nd?Fe₂+??Ce,Nd?,and 8 three-phase regions:?Ce,Nd?Fe₄B₄+Fe₂B+?-Fe,?Ce,Nd?Fe₄B₄+?Ce,Nd?₂Fe₁₄B+?-Fe,?Ce,Nd?Fe₄B₄+?Ce,Nd?₂Fe₁₄B+??Ce,Nd?,?Ce,Nd?₅Fe₁₇+?Ce,Nd?₂Fe₁₄B+??Ce,Nd?,?Ce,Nd?₅Fe₁₇+?Ce,Nd?₂Fe₁₄B+?Ce,Nd?Fe₂,?Ce,Nd?Fe₂+?Ce,Nd?₂Fe₁₄B+??Ce,Nd?,?Ce,Nd?₂Fe₁₇+?Ce,Nd?₂Fe₁₄B+?Ce,Nd?Fe₂ and?Ce,Nd?Fe₄B₄+?Ce,Nd?₂Fe₁₄B+?Ce,Nd?Fe₂ were identified.Additionally,Ce₂Fe₁₄B–Nd₂Fe₁₄B and CeFe₄B₄–NdFe₄B₄ were found to form continuous solid solutions,termed as?Ce,Nd?₂Fe₁₄B and?Ce,Nd?Fe₄B₄,respectively.