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- Choe, Wonyoung
- Laboratory for Sustainable Future
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“Nanoscale Zippers” in the Crystalline Solid. StructuralVariations in the Giant Magnetocaloric MaterialGd 5 Si 1.5Ge 2.5
- Author(s)
- Choe, Wonyoung, Miller, GJ, Meyers, J, Chumbley, S, Pecharsky, AO
- Issued Date
- 2003-04
- Citation
- CHEMISTRY OF MATERIALS, v.15, no.7, pp.1413 - 1419
- Abstract
- The magnetocaloric material Gd5Si1.5Ge2.5 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 SM5Ge4-type and twinned, monoclinic Gd5Si2Ge2-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.
- Publisher
- AMER CHEMICAL SOC
- ISSN
- 0897-4756
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