作者:J.Q. Li、W.H. Zhang、Y.J. Yu、F.S. Liu、W.Q. Ao、J.L. Yan
DOI:10.1016/j.jallcom.2009.07.154
日期:2009.11
The isothermal section of the Nd-Fe-Ga ternary system at 773 K was constructed using X-ray diffraction analysis. Ten binary compounds, Nd2Fe17, Nd5Fe17, Nd9Ga4, Nd5Ga3, NdGa, NdGa2, FeGa3, Fe3Ga4, alpha-Fe6Ga5 and alpha-Fe3Ga, and three ternary compounds, NdFe2Ga8, NdFe5Ga7 and Nd6Fe13Ga were existed in this isothermal section. The solid solutions Nd2Fe17.00-15.57Ga0-1.43 (Th2Zn17-type structure, space group R (3) over barm, NdFe5.46-4.65Ga6.(54-7.35) (ThMn12-type structure, space group 14/mmm) and Nd6Fe13.0-12.Ga-0(1.0-2.0) (La6Co11Ga3-type structure, space group 14/mcm) were formed by substitution of Ga for Fe in the compounds Nd2Fe17, NdFe5Ga7 and Nd6Fe13Ga at 773 K, respectively. The ternary compound NdFe2Ga8 is CaCo2Al8-type (space group Pbam) with a = 1.43742 (4), b = 1.24601 (4), c = 0.40479 (1)). The homogeneity range of NdGa2 is from 66.7 to 74.7 at.% Gain Nd-Ga side but the solid solubility of Fe in this compound is very small. The homogeneity ranges of Nd6Fe13Ga and NdFe5Ga7 are from 5.0 to 10.0 and from 50.3 to 56.5 at.% Ga, respectively. The maximum solid solubilities of Ga in Nd2Fe17 is 7.5. The homogeneity ranges for the other compounds are small. (C) 2009 Elsevier B.V. All rights reserved.