Crystal structures and phase relationships in magnetostrictive Tb1-xDyxCo2 system
Author ORCID Identifier
Journal of Physics Condensed Matter
The crystal structures and phase relationships of Tb1-xDyxCo2 alloys with 0 x 1 were investigated by synchrotron-based high-resolution X-ray powder diffraction. Three different crystal structures are observed in the system: All the compositions show cubic structure with space group Fd3m at temperatures above the Curie temperature T C; the Tb-rich side sample shows a rhombohedral structure with space group R3M and the Dy-rich side sample has a tetragonal I41/amd space group. In situ measurements on the intermediate compound Tb0.3Dy0.7Co2 show a rhombohedral to tetragonal structural transition, and the two phases coexist from 99 K to 111 K, where the so-called magnetic morphotropic phase boundary (MPB) is found. The coexisting phases are believed to induce the anomalous magnetostrictive effect in the MPB regime.
Crystal structure, Laves phase, Mpb, Rietveld, Synchrotron
Chang, Tieyan; Zhou, Chao; Mi, Jingwen; Chen, Kaiyun; Tian, Fanghua; Chen, Yu-Sheng; Wang, SuYin G.; Ren, Yang; Brown, Dennis E.; Song, Xiaoping; and Yang, Sen, "Crystal structures and phase relationships in magnetostrictive Tb1-xDyxCo2 system" (2020). NIU Bibliography. 503.
Department of Physics