Skip to main content
Persistence of 5:3 plates in RE5(SixGe1-x)4 alloys
Journal of Materials Research
  • O. Ugurlu, Iowa State University
  • L. Scott Chumbley, Iowa State University
  • C. R. Fisher, Iowa State University
Document Type
Publication Date
Studies of RE5(SixGe1-x)4 alloys, where RE equals rare earth, have revealed a second-phase having a thin-plate morphology in essentially every alloy examined, independent of exact composition and matrix crystal structure. Identified as having a composition approximating Gd5(SixGe1-x)3 and a hexagonal crystal structure in the Gd-based system, it has been suggested that the observed thin-plate second phases seen in this family of rare earth alloys are all most likely of the form RE5(SixGe1-x)3. A number of interesting observations suggest that the formation of these second-phase plates is somewhat unusual. The purpose of this article is to investigate the stability of this second phase in Gd- and Er-based compounds. The stability was investigated as a function of thermal cycling and large-scale composition fluctuations. The results of scanning and transmission electron microscopy (SEM, TEM) studies indicate that the RE5(SixGe1-x)3 phase is extremely stable once it forms in a RE5(SixGe1-x)4 matrix.

This article is from Journal of Materials Research 21 (2006): 2669-2674, doi: 10.1557/jmr.2006.0326. Posted with permission.

Copyright Owner
Materials Research Society
File Format
Citation Information
O. Ugurlu, L. Scott Chumbley and C. R. Fisher. "Persistence of 5:3 plates in RE5(SixGe1-x)4 alloys" Journal of Materials Research Vol. 21 Iss. 10 (2006) p. 2669 - 2674
Available at: