Ce-Ge二元体系的实验研究
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摘要
采用SEM和EPMA等方法对Ce-Ge二元合金在成分40%～60%Ge(原子分数)之间的铸态凝固组织进行了表征,用以验证了Ce-Ge二元体系的部分不变反应。实验结果表明:化合物(CeGe)相一致熔融;化合物Ce_5Ge_4由包晶反应L+Ce_5Ge_3→Ce_5Ge_4形成,并可观测到两个明显的共晶组织:L→Ce_5Ge_4+(CeGe)和L→(CeGe)+(βCeGe_(1.7))。根据本研究结果,对原有文献建立的Ce-Ge二元相图的相平衡关系进行了部分修正。
The as-cast solidified microstructures of the Ce-Ge alloys between 40%-60% Ge(atom fraction)was measured by SEM and EPMA in order to verify some of the invariant reactions of the Ce-Ge system.The experiments show that the compound(CeGe)melts congruently;the compound Ce_5Ge_4 is formed by the invariant peritectic reaction L+Ce_5Ge_3→Ce_5Ge_4 and the microstructures of two eutectic reactions L→Ce_5Ge_4+(CeGe)and L→(CeGe)+(βCeGe_(1.7))are observed.According to the present investigation,some phase equilibrium relations of the Ce-Ge phase diagram reported in the literature are modified.
The as-cast solidified microstructures of the Ce-Ge alloys between 40%-60% Ge(atom fraction)was measured by SEM and EPMA in order to verify some of the invariant reactions of the Ce-Ge system.The experiments show that the compound(CeGe)melts congruently;the compound Ce_5Ge_4 is formed by the invariant peritectic reaction L+Ce_5Ge_3→Ce_5Ge_4 and the microstructures of two eutectic reactions L→Ce_5Ge_4+(CeGe)and L→(CeGe)+(βCeGe_(1.7))are observed.According to the present investigation,some phase equilibrium relations of the Ce-Ge phase diagram reported in the literature are modified.
引文
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[7]高远,朱刘.热压烧结P型碲化铋基热电材料的显微组织与性能[J].粉末冶金工业,2016,26(3):49.
[8]张攀,王忠,陈晖,等.机械合金化制备N型Si80Ge20块体热电材料的微观结构与电性能的研究[J].金属功能材料,2011,18(1):10.
[9]Eremenko V N,Shi Z K,Buyanov Y I,et al.Constitution diagram of the system lanthanum-germanium in the 50-100at.%germanium range[J].Soviet Powder Metallurgy&Metal Ceramics,1971,10(8):661.
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[13]Gokhale A B,Abbaschian G J.The Ce-Ge(cerium-germanium)system[J].Bull.Alloy Phase Diagram,1989,10:142.
[2]Atanackovic P B.Thin film solar cell[P].U.S.Patent No.7928317.2011-04-19.
[3]Atanackovic P.Thin film semi-conductor-on-glass solar cell devices[P].U.S.Patent No.8071872.2011-12-06.
[4]Bérardan D,Godart C,Alleno E,et al.Chemical properties and thermopower of the new series of skutterudite Ce1-pYbpFe4Sb12[J].Journal of Alloys&Compounds,2003,351(1/2):18.
[5]Berardan D,Alleno E,Godart C,et al.Improved thermoelectric properties in double-filled Cey/2Yby/2Fe4-x(Co/Ni)xSb12skutterudites[J].Journal of Applied Physics,2005,98(3):1325.
[6]Lamberton Jr G A,Tedstrom R H,Tritt T M,et al.Thermoelectric properties of Yb-filled Ge-compensated CoSb3skutterudite materials[J].Journal of Applied Physics,2005,97(11):407.
[7]高远,朱刘.热压烧结P型碲化铋基热电材料的显微组织与性能[J].粉末冶金工业,2016,26(3):49.
[8]张攀,王忠,陈晖,等.机械合金化制备N型Si80Ge20块体热电材料的微观结构与电性能的研究[J].金属功能材料,2011,18(1):10.
[9]Eremenko V N,Shi Z K,Buyanov Y I,et al.Constitution diagram of the system lanthanum-germanium in the 50-100at.%germanium range[J].Soviet Powder Metallurgy&Metal Ceramics,1971,10(8):661.
[10]Eremenko V N,Shi Z K,Buyanov Yu I,et al.Ge-La(germanium-lanthanum)[J].Dop.Akad.Nauk Ukr.RSR,B,1972,34:1080.
[11]Gschneidner Jr K A,Calderwood F W.Chapter 54Intra rare earth binary alloys:Phase relationships,lattice parameters and systematics[M].Handbook on the Physics and Chemistry of Rare Earths,1986.
[12]Samsonov G V,Paderno Yu B,Rud B M.Physical properties of germanides of rare earth metals ceric group and yttrium[J].Rev.Int.Hautes Temp.Réfract,1968,5:105.
[13]Gokhale A B,Abbaschian G J.The Ce-Ge(cerium-germanium)system[J].Bull.Alloy Phase Diagram,1989,10:142.