Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd{sub 5}(Si{sub 2}Ge{sub 2})
Abstract
A temperature-dependent, single crystal x-ray diffraction study of the giant magnetocaloric material, Gd{sub 5}( Si{sub 2}Ge {sub 2}) , across its Curie temperature (276 K) reveals that the simultaneous orthorhombic to monoclinic transition occurs by a shear mechanism in which the (Si, Ge)- (Si, Ge) dimers that are richer in Ge increase their distances by 0.859(3) Angstrom and lead to twinning. The structural transition changes the electronic structure, and provides an atomic-level model for the change in magnetic behavior with temperature in the Gd{sub 5}( Si{sub x}Ge {sub 1-x}){sub 4} . (c) 2000 The American Physical Society.
- Authors:
-
- Department of Chemistry, Iowa State University, Ames, Iowa 50011 (United States)
- Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 (United States)
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
- Publication Date:
- OSTI Identifier:
- 20216590
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 84; Journal Issue: 20; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; GADOLINIUM ALLOYS; SILICON ALLOYS; GERMANIUM ALLOYS; X-RAY DIFFRACTION; MONOCRYSTALS; CHEMICAL BONDS; CURIE POINT; PHASE TRANSFORMATIONS; TWINNING; CRYSTAL STRUCTURE; ELECTRONIC STRUCTURE; TEMPERATURE DEPENDENCE; MAGNETO-THERMAL EFFECTS; EXPERIMENTAL DATA
Citation Formats
Choe, W, Pecharsky, V K, Pecharsky, A O, Gschneidner, Jr, K A, Young, Jr, V G, and Miller, G J. Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd{sub 5}(Si{sub 2}Ge{sub 2}). United States: N. p., 2000.
Web. doi:10.1103/PhysRevLett.84.4617.
Choe, W, Pecharsky, V K, Pecharsky, A O, Gschneidner, Jr, K A, Young, Jr, V G, & Miller, G J. Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd{sub 5}(Si{sub 2}Ge{sub 2}). United States. https://doi.org/10.1103/PhysRevLett.84.4617
Choe, W, Pecharsky, V K, Pecharsky, A O, Gschneidner, Jr, K A, Young, Jr, V G, and Miller, G J. Mon .
"Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd{sub 5}(Si{sub 2}Ge{sub 2})". United States. https://doi.org/10.1103/PhysRevLett.84.4617.
@article{osti_20216590,
title = {Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd{sub 5}(Si{sub 2}Ge{sub 2})},
author = {Choe, W and Pecharsky, V K and Pecharsky, A O and Gschneidner, Jr, K A and Young, Jr, V G and Miller, G J},
abstractNote = {A temperature-dependent, single crystal x-ray diffraction study of the giant magnetocaloric material, Gd{sub 5}( Si{sub 2}Ge {sub 2}) , across its Curie temperature (276 K) reveals that the simultaneous orthorhombic to monoclinic transition occurs by a shear mechanism in which the (Si, Ge)- (Si, Ge) dimers that are richer in Ge increase their distances by 0.859(3) Angstrom and lead to twinning. The structural transition changes the electronic structure, and provides an atomic-level model for the change in magnetic behavior with temperature in the Gd{sub 5}( Si{sub x}Ge {sub 1-x}){sub 4} . (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevLett.84.4617},
url = {https://www.osti.gov/biblio/20216590},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 84,
place = {United States},
year = {2000},
month = {5}
}
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