PHASE DIAGRAM OF Nd-Pd(Nd≤50at.-％) BINARY SYSTEM

Acta Metall Sin

1991, Vol. 27

Issue (1): 94-97 DOI:

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PHASE DIAGRAM OF Nd-Pd(Nd≤50at.-％) BINARY SYSTEM

CHEN Lili;ZHANG Kanghou Institute of Precious Metals; Kunming

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CHEN Lili;ZHANG Kanghou Institute of Precious Metals; Kunming. PHASE DIAGRAM OF Nd-Pd(Nd≤50at.-％) BINARY SYSTEM. Acta Metall Sin, 1991, 27(1): 94-97.

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Abstract The region containing O-50at. -%Nd in Nd-Pd phase diagram has beenstudied with X-ray diffraction, differential thermal analysis and micrography. Ithas been found that there are six intermetallic compounds, viz: NdPd_5, NdPd_3, NdPd_2,Nd_2Pd_3, Nd_4Pd_5 and NdPd in the region. NdPd_3, Nd_4Pd_5 and NdPd are solid-liquidcongruent compoundls with melting points of 1217±4℃, 970±4℃ and 952±4℃respectively. It has been determined also that NdPd_5 has a SmPt_5-type structure withα=0.5265nm, b=0.9219nm and c=2.570nm, NdPd_3 a AuCu_3-type structure withα=0.4137nm, and NdPd below 708±4℃ a CrB-type structure with α=0.3827nm.b=1.079nm and c=0.4547nm. There exist three eutectic reactions L?(Pd)+NdPd_5,L?NdPd_2+Nd_2Pd_3 and L?Nd_4Pd_5+NdPd, and three peritectic reactions L+NdPd_3?-NdPd_5, L+NdPd+3?NdPd_2 and L+Nd_4Pd_5?Nd_2Pd_3 in the region.

Key words: Nd-Pd binary system phase diagram X-ray diffraction differential thermal analysis

Received: 18 January 1991

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