Microstructural analysis of twinnedβ−Gd5Si2Ge | Zendy

John Meyers | Zendy; Scott Chumbley | Zendy; Wonyoung Choe | Zendy; Gordon J. Miller | Zendy

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Microstructural analysis of twinnedβ−Gd5Si2Ge

Author(s) -

John Meyers,

Scott Chumbley,

Wonyoung Choe,

Gordon J. Miller

Publication year - 2002

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.66.012106

Subject(s) - crystal twinning , crystallography , materials science , transmission electron microscopy , diffraction , microstructure , physics , nanotechnology , chemistry , optics

The room-temperature microstructure of the giant magnetocaloric material Gd 5 Si 2 Ge 2 is investigated using transmission electron microscopy and selected area diffraction. Nonmerohedral twinning is identified and its twinlaw, which relates one twin component to the other, is revealed. Based on selected area diffraction pattern data, we build a structural model for nonmerohedral twinning and explain its origin in terms of the irregular shear movement of two-dimensional ∞ 2 [Gd 5 (Si 2 Ge 2 )] slabs held together by (Si,Ge) dimers.

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