The isothermal section of the Nd–Fe–Ga ternary system at 773 K
The isothermal section of the Nd–Fe–Ga ternary system at 773 K
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DOI：
10.1016/j.jallcom.2009.07.154
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发表时间：
2009-11
影响因子：
6.2
通讯作者：
Jun-qing Li;Wei Zhang;Y. J. Yu;F. S. Liu;W. Ao;J. L. Yan
中科院分区：
文献类型：
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作者：
Jun-qing Li;Wei Zhang;Y. J. Yu;F. S. Liu;W. Ao;J. L. Yan
利用X射线衍射分析方法，绘制了Nd-Fe-Ga三元系在773 K的等温截面。在该等温截面中存在Nd_2Fe_（17）、Nd_5Fe_（17）、Nd_9Ga_4、Nd_5Ga_3、NdGa、NdGa_2、FeGa_3、Fe_3Ga_4、α-Fe_6 Ga_5和α-Fe_3Ga等10种二元化合物和NdFe_2Ga_8、NdFe_5Ga_7和Nd_6Fe_（13）Ga等3种三元化合物。在773 K下，Ga分别取代Nd 2Fe 17、NdFe 5Ga 7和Nd 6 Fe 13 Ga中的Fe，形成了固溶体Nd2Fe17.00-15.57Ga0-1.43（Th 2 Zn 17型结构，空间群R3 <$m）、NdFe 5.46 - 4.65Ga 6.54 -7.35（ThMn 12型结构，空间群I4/mmm）和Nd 6 Fe 13.0 - 12.0Ga 1.0 -2.0（La 6Co 11 Ga 3型结构，空间群I4/mcm）。三元化合物NdFe_2Ga_8为CaCo_2Al_8型（空间群Pbam），a=1.43742（4），B=1.24601（4），c=0.40479（1））。NdGa_2的均匀性范围为66.7 ~ 74.7at.% Ga在Nd-Ga侧的固溶度很低，但Fe在该化合物中的固溶度很小。Nd_6Fe_（13）Ga和NdFe_（55）Ga_（7）的均匀性范围分别为5.0 ~ 10.0和50.3 ~ 56.5at.% Ga，分别。Ga在Nd_2Fe_（17）中的最大固溶度为7.5。其他化合物的均匀性范围较小。
The isothermal section of the Nd–Fe–Ga ternary system at 773K was constructed using X-ray diffraction analysis. Ten binary compounds, Nd2Fe17, Nd5Fe17, Nd9Ga4, Nd5Ga3, NdGa, NdGa2, FeGa3, Fe3Ga4, α-Fe6Ga5and α-Fe3Ga, and three ternary compounds, NdFe2Ga8, NdFe5Ga7and Nd6Fe13Ga were existed in this isothermal section. The solid solutions Nd2Fe17.00–15.57Ga0–1.43(Th2Zn17-type structure, space group R3¯m), NdFe5.46–4.65Ga6.54–7.35(ThMn12-type structure, space group I4/mmm) and Nd6Fe13.0–12.0Ga1.0–2.0(La6Co11Ga3-type structure, space group I4/mcm) were formed by substitution of Ga for Fe in the compounds Nd2Fe17, NdFe5Ga7and Nd6Fe13Ga at 773K, respectively. The ternary compound NdFe2Ga8is CaCo2Al8-type (space group Pbam) with a=1.43742 (4), b=1.24601 (4), c=0.40479 (1)). The homogeneity range of NdGa2is from 66.7 to 74.7at.% Ga in Nd–Ga side but the solid solubility of Fe in this compound is very small. The homogeneity ranges of Nd6Fe13Ga and NdFe5Ga7are from 5.0 to 10.0 and from 50.3 to 56.5at.% Ga, respectively. The maximum solid solubilities of Ga in Nd2Fe17is 7.5. The homogeneity ranges for the other compounds are small.