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DOE OSTI2020

Materials Data on TiAl3 by Materials Project

Al3Ti is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ti is bonded to twelve Al atoms to form TiAl12 cuboctahedra that share corners with four equivalent TiAl12 cuboctahedra, corners with eight equivalent AlTi4Al8 cuboctahedra, edges with eight equivalent TiAl12 cuboctahedra, edges with sixteen equivalent AlTi4Al8 cuboctahedra, faces with four equivalent TiAl12 cuboctahedra, and faces with fourteen AlTi4Al8 cuboctahedra. There are four shorter (2.72 Å) and eight longer (2.88 Å) Ti–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Ti and eight equivalent Al atoms to form AlTi4Al8 cuboctahedra that share corners with four equivalent AlTi4Al8 cuboctahedra, corners with eight equivalent TiAl12 cuboctahedra, edges with twenty-four AlTi4Al8 cuboctahedra, faces with six equivalent TiAl12 cuboctahedra, and faces with twelve AlTi4Al8 cuboctahedra. All Al–Al bond lengths are 2.88 Å. In the second Al site, Al is bonded to four equivalent Ti and eight Al atoms to form AlTi4Al8 cuboctahedra that share corners with twelve equivalent AlTi4Al8 cuboctahedra, edges with eight equivalent TiAl12 cuboctahedra, edges with sixteen AlTi4Al8 cuboctahedra, faces with four equivalent TiAl12 cuboctahedra, and faces with fourteen AlTi4Al8 cuboctahedra. All Al–Al bond lengths are 2.72 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiAl3 by Materials Project

Al3Ti is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ti is bonded to twelve equivalent Al atoms to form TiAl12 cuboctahedra that share corners with twelve equivalent TiAl12 cuboctahedra, edges with twenty-four equivalent AlTi4Al8 cuboctahedra, faces with six equivalent TiAl12 cuboctahedra, and faces with twelve equivalent AlTi4Al8 cuboctahedra. All Ti–Al bond lengths are 2.81 Å. Al is bonded to four equivalent Ti and eight equivalent Al atoms to form AlTi4Al8 cuboctahedra that share corners with twelve equivalent AlTi4Al8 cuboctahedra, edges with eight equivalent TiAl12 cuboctahedra, edges with sixteen equivalent AlTi4Al8 cuboctahedra, faces with four equivalent TiAl12 cuboctahedra, and faces with fourteen equivalent AlTi4Al8 cuboctahedra. All Al–Al bond lengths are 2.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiAl3 by Materials Project

Al3Ti is Magnesium-derived structured and crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. Ti is bonded to two equivalent Ti and ten Al atoms to form TiTi2Al10 cuboctahedra that share corners with eight equivalent AlTi4Al8 cuboctahedra, corners with ten equivalent TiTi2Al10 cuboctahedra, edges with two equivalent TiTi2Al10 cuboctahedra, edges with sixteen AlTi4Al8 cuboctahedra, faces with four equivalent TiTi2Al10 cuboctahedra, and faces with sixteen AlTi4Al8 cuboctahedra. Both Ti–Ti bond lengths are 2.84 Å. There are a spread of Ti–Al bond distances ranging from 2.83–2.85 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Ti and eight Al atoms to form AlTi4Al8 cuboctahedra that share corners with eight equivalent TiTi2Al10 cuboctahedra, corners with ten equivalent AlTi4Al8 cuboctahedra, edges with four equivalent TiTi2Al10 cuboctahedra, edges with fourteen AlTi4Al8 cuboctahedra, faces with four equivalent TiTi2Al10 cuboctahedra, and faces with sixteen AlTi4Al8 cuboctahedra. There are two shorter (2.84 Å) and six longer (2.86 Å) Al–Al bond lengths. In the second Al site, Al is bonded to four equivalent Ti and eight Al atoms to form AlTi4Al8 cuboctahedra that share corners with eighteen AlTi4Al8 cuboctahedra, edges with eight equivalent TiTi2Al10 cuboctahedra, edges with ten AlTi4Al8 cuboctahedra, faces with four equivalent TiTi2Al10 cuboctahedra, and faces with sixteen AlTi4Al8 cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.81–2.85 Å. In the third Al site, Al is bonded to two equivalent Ti and ten Al atoms to form AlTi2Al10 cuboctahedra that share corners with eighteen AlTi4Al8 cuboctahedra, edges with four equivalent TiTi2Al10 cuboctahedra, edges with fourteen AlTi4Al8 cuboctahedra, faces with eight equivalent TiTi2Al10 cuboctahedra, and faces with twelve AlTi4Al8 cuboctahedra. Both Al–Al bond lengths are 2.84 Å.

36 MATERIALS SCIENCE↗