Magnetic field-induced changes of lattice parameters and thermal expansion behavior of the CoMnSi compound

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-015-9496-9· OSTI ID:1245578

Kou, R. H.; Gao, J.; Wang, G.; Liu, Y. D.; Wang, Y. D.; Ren, Y.; Brown, D. E.

The crystal structure of the CoMnSi compound during zero-field cooling and field cooling from room temperature down to 200 K was studied using the synchrotron radiation X-ray diffraction technique. The results show that the lattice parameters and thermal expansion behavior of the sample are changed by the applied magnetic fields. The lattice contracts along the a axis, but expands along the b and c axes. Due to enlarged and anisotropic changes under a magnetic field of 6 T, the lattice shows an invar-like behavior along all three axes. Critical interatomic distances and bond angles also show large changes under the influence of such a high magnetic field. These magnetic field-induced changes of the lattice are discussed with respect to their contributions to the large magnetocaloric effect of the CoMnSi compound.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Basic Research Program of China; Fundamental Research Funds for the Central Universities; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1245578
• Journal Information: Journal of Materials Science, Vol. 51, Issue 4; ISSN 0022-2461
• Publisher: Springer
• Country of Publication: United States
• Language: English