Soviet Powder Metallurgy and Metal Ceramics

, Volume 7, Issue 12, pp 964–965 | Cite as

The phases in the lanthanum-germanium system

  • K. A. Lynchak
  • Yu. B. Kuz'ma
  • T. Ya. Kosolapova
Test Methods and Properties of Materials


The lanthanum-germanium system was investigated. The existence of four, previously established compounds was confirmed. The width of the homogeneity region of the lanthanum-rich compounds is narrow. The width of the homogeneity region of lanthanum digermanide extends over the composition range LaGe-LaGe2.0, which corresponds to germanium contents of 42–51%. Lanthanum digermanide exhibits two modifications with crystalline structures of the α-ThSi2 and α-GdSi2 types, which are capable of independent existence at room temperature. The phase with an α-GdSi2 type structure forms at germanium contents corresponding to the compositions LaGe1.8-LaGe2.0, while the α-ThSi2 type structure forms at germanium contents lower than theoretical (42–45 wt.%). At the composition LaGe1.7, the phases with the α-GdSi2 and α-ThSi2 type structures coexist.


Germanium Lanthanum Crystalline Structure Structure Form Type Structure 
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Copyright information

© Consultants Bureau 1969

Authors and Affiliations

  • K. A. Lynchak
    • 1
  • Yu. B. Kuz'ma
    • 1
  • T. Ya. Kosolapova
    • 1
  1. 1.Institute of Materials ScienceAcademy of Sciences of the Ukrainian SSRUkraine

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