Hydrogen ordering in rare-earth intermetallic (Er, Tb)Fe2 compounds with giant spontaneous magnetostriction

Magnetic and Magnetostrictive Properties of Rare Earth Intermetallic Compounds

“…As the authors of the works [4][5][6][7][8][9][10][11][12][13][14] state, all the studied alloys were single phase after annealing and had a structural type of Laves phase С15.…”

“…Due to a single-ion nature of interactions between the 4f ions and crystalline field of the lattice, in quasibinary systems of the type (R I 1-xRх II )Fe2, where R I and R II are rare earth metals with magnetostriction constants of the opposite sign, e.g., Er and Tb, when passing through a critical concentration, there is a change of sign of the magnetostriction constant λ111 without a change in the type of anisotropy. L.A. Stashkova et al [12] presented the results of X-ray research into structure of Er1-xTbxFe2 (0 ≤ х ≤ 0.6) compounds and their hydrides. Ordering of hydrogen, absorbed by RFe2 compounds may cause a crystalline lattice deformation that is significantly larger than the magnetoelastic deformation.…”

“…Powder pattern of the Er0,8Tb0,2Fe2 alloy: experiment (points) and calculations (solid line). Figure 9 shows a concentration dependence of the magnetostriction constant λ111 of the Er1-xTbxFe2 alloys plotted from the experimental values of magnetostriction for boundary compounds (dark squares) with considerations for the singleion nature of changes in the magnetostriction value depending on concentration (dash line) and from the results of [12] (light squares).…”

Ittrium influence on exchange interactions in Laves phases (Tb1-хYх)0.8 Sm0.2Fe2

“…Besides, rare-earth intermetallic compounds, isotype to S 15 Laves phases undergo structural phase transitions during transitions into magneto ordered state with crystalline phase distortions. In [6,7] there was information about low symmetric modifications in intermetallides TbCo 2 , TbFe 2 and TmFe 2 . Spontaneous magnetostriction, with "gigantic" values ~ 10 -3 was the cause for crystalline distortions S15.…”

“…Among Laves phases R М 2 there are intermetallides which together with greater spontaneous magnetostriction demonstrate gigantic magnetostriction induced with outer magnetic field [6].…”