“Nanoscale Zippers” in the Crystalline Solid. Structural Variations in the Giant Magnetocaloric Material Gd5Si1.5Ge2.5 | Zendy

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

Open Access

“Nanoscale Zippers” in the Crystalline Solid. Structural Variations in the Giant Magnetocaloric Material Gd₅Si_1.5Ge_2.5

Author(s) -

Wonyoung Choe,

Gordon J. Miller,

John Meyers,

Scott Chumbley,

A. O. Pecharsky

Publication year - 2003

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/cm020928l

Subject(s) - orthorhombic crystal system , monoclinic crystal system , crystallography , materials science , magnetic refrigeration , crystal structure , crystallite , crystal (programming language) , x ray crystallography , phase (matter) , diffraction , chemistry , magnetization , physics , organic chemistry , quantum mechanics , magnetic field , computer science , programming language , optics

The magnetocaloric material Gd 5 Si 1.5 Ge 2.5 has been synthesized and its crystal structures at 292 and 163 K are reported from single-crystal X-ray diffraction experiments. At room temperature, orthorhombic Sm 5 Ge 4 -type and twinned, monoclinic Gd 5 Si 2 Ge 2 -type phases coexist in single crystal specimens. This phenomenon is mainly due to the covalent bond breaking and formation of (Si,Ge)-(Si,Ge) dimers during the crystallographic phase transition. We suggest an atomic-level model for the interface of the two distinct domains. A detailed TEM analysis also confirms the coexistence of both phases in a polycrystalline sample. The structural relationship between such nanoscale zippers and other known phases is identified.

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