MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
High-Magnetic Field X-ray Diffraction Studies on Gd5(Ge2−xFex)Si2 (x=0.05 and 0.2)
Jim Long HerKeiichi KoyamaKazuo WatanabeVirgil ProvenzanoAnqi FuAlexander J. ShapiroRobert D. Shull
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2005 Volume 46 Issue 9 Pages 2011-2014

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Abstract

We performed the powder X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.05)Si2 clearly shows a structural transition from an orthorhombic to a monoclinic structure at the Curie temperature (TC=276 K). On the other hand, the matrix of Gd5(Ge1.8Fe0.2)Si2 with the orthorhombic structure in the ferromagnetic state shows two-phases co-existence of the orthorhombic and the monoclinic structures above TC=303 K, indicating that a small amount of the matrix participates in the transformation. For both samples, the monoclinic structure is suppressed but the orthorhombic structure is enhanced just above TC by applying a magnetic field, which closely relates to the magnetization process.

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© 2005 The Japan Institute of Metals and Materials
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