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All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Structural and magnetic properties of magnetostrictive Fe-Ga-Zr nanocrystalline alloy

(Fe 1–x Ga x ) 92 Zr 8 amorphous and nanocrystalline alloys with x = 0.15 to x = 0.36 were investigated to improve the magnetic softness of Galfenol-type alloys and to evaluate their magnetostrictive properties. The samples were prepared by melt spinning of arc melted ingots. The rapidly solidified ribbons were annealed at 823 K for 1 h to produce a nanocrystalline structure. X-ray Diffraction data showed that after annealing, body-centered cubic (BCC) Fe-Ga phase crystallized for x = 0.15 to x = 0.26. When x exceeded 0.26, the ribbons crystallized into BCC and a ternary intermetallic phase (i.e., ZrFe 6 Ga 6 ) which has deteriorating effect on saturation magnetization, magnetic softness and magnetostriction coefficient. The annealed ribbons’ saturation magnetization value decreases from 126 Am 2 /kg to 54 Am 2 /kg as the Ga content increased from x = 0.15 to x = 0.36. The alloy with x = 0.26 annealed at 823 K for 1 h shows a peak magnetostriction of 10 ppm with saturation magnetization of 110 Am 2 /kg and coercivity of 260 A/m.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr6Ga2Fe by Materials Project

Zr6FeGa2 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 2-coordinate geometry to two equivalent Fe and two equivalent Ga atoms. Both Zr–Fe bond lengths are 2.58 Å. Both Zr–Ga bond lengths are 3.02 Å. In the second Zr site, Zr is bonded in a 5-coordinate geometry to one Fe and four equivalent Ga atoms. The Zr–Fe bond length is 3.16 Å. All Zr–Ga bond lengths are 2.94 Å. Fe is bonded in a 6-coordinate geometry to nine Zr atoms. Ga is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr(GaFe)6 by Materials Project

Zr(FeGa)6 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Zr is bonded to twelve Fe and eight Ga atoms to form distorted ZrGa8Fe12 hexagonal bipyramids that share corners with eight equivalent ZrGa8Fe12 hexagonal bipyramids, faces with twenty-four FeZr2Ga6Fe4 cuboctahedra, and faces with two equivalent ZrGa8Fe12 hexagonal bipyramids. There are four shorter (3.24 Å) and eight longer (3.26 Å) Zr–Fe bond lengths. There are two shorter (2.79 Å) and six longer (2.93 Å) Zr–Ga bond lengths. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to two equivalent Zr, four equivalent Fe, and six Ga atoms to form distorted FeZr2Ga6Fe4 cuboctahedra that share corners with fourteen FeZr2Ga6Fe4 cuboctahedra, edges with seven FeZr2Ga6Fe4 cuboctahedra, faces with nine FeZr2Ga6Fe4 cuboctahedra, and faces with four equivalent ZrGa8Fe12 hexagonal bipyramids. All Fe–Fe bond lengths are 2.49 Å. There are a spread of Fe–Ga bond distances ranging from 2.56–2.61 Å. In the second Fe site, Fe is bonded to two equivalent Zr, four Fe, and six Ga atoms to form distorted FeZr2Ga6Fe4 cuboctahedra that share corners with fourteen FeZr2Ga6Fe4 cuboctahedra, edges with six FeZr2Ga6Fe4 cuboctahedra, faces with ten FeZr2Ga6Fe4 cuboctahedra, and faces with four equivalent ZrGa8Fe12 hexagonal bipyramids. Both Fe–Fe bond lengths are 2.50 Å. There are two shorter (2.54 Å) and four longer (2.58 Å) Fe–Ga bond lengths. There are three inequivalent Ga sites. In the first Ga site, Ga is bonded in a 8-coordinate geometry to one Zr, six Fe, and one Ga atom. The Ga–Ga bond length is 2.88 Å. In the second Ga site, Ga is bonded in a 10-coordinate geometry to one Zr, six Fe, and three Ga atoms. There are one shorter (2.73 Å) and two longer (2.87 Å) Ga–Ga bond lengths. In the third Ga site, Ga is bonded in a 8-coordinate geometry to two equivalent Zr, six Fe, and two equivalent Ga atoms.

36 MATERIALS SCIENCE↗