DOI: 10.17188/1683663
title: Materials Data on Ho4ZrAl15 by Materials Project

description: Al15Ho4Zr is Uranium Silicide-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to twelve Al atoms to form HoAl12 cuboctahedra that share corners with four equivalent ZrAl12 cuboctahedra, corners with eight HoAl12 cuboctahedra, edges with twenty-four AlHo2Zr2Al8 cuboctahedra, a faceface with one ZrAl12 cuboctahedra, faces with five HoAl12 cuboctahedra, and faces with twelve AlHo4Al8 cuboctahedra. There are four shorter (2.98 Å) and eight longer (3.00 Å) Ho–Al bond lengths. In the second Ho site, Ho is bonded to twelve Al atoms to form HoAl12 cuboctahedra that share corners with twelve HoAl12 cuboctahedra, edges with twenty-four AlHo4Al8 cuboctahedra, faces with six HoAl12 cuboctahedra, and faces with twelve AlHo4Al8 cuboctahedra. There are four shorter (2.98 Å) and eight longer (2.99 Å) Ho–Al bond lengths. Zr is bonded to twelve Al atoms to form ZrAl12 cuboctahedra that share corners with four equivalent ZrAl12 cuboctahedra, corners with eight equivalent HoAl12 cuboctahedra, edges with twenty-four AlHo2Zr2Al8 cuboctahedra, faces with two equivalent HoAl12 cuboctahedra, faces with four equivalent ZrAl12 cuboctahedra, and faces with twelve AlHo2Zr2Al8 cuboctahedra. There are eight shorter (2.93 Å) and four longer (2.98 Å) Zr–Al bond lengths. There are six inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Zr and eight equivalent Al atoms to form AlZr4Al8 cuboctahedra that share corners with twelve AlZr4Al8 cuboctahedra, edges with eight equivalent HoAl12 cuboctahedra, edges with sixteen equivalent AlHo2Zr2Al8 cuboctahedra, faces with four equivalent ZrAl12 cuboctahedra, and faces with fourteen AlHo2Zr2Al8 cuboctahedra. All Al–Al bond lengths are 2.93 Å. In the second Al site, Al is bonded to four equivalent Ho and eight Al atoms to form distorted AlHo4Al8 cuboctahedra that share corners with twelve AlZr4Al8 cuboctahedra, edges with four equivalent HoAl12 cuboctahedra, edges with four equivalent ZrAl12 cuboctahedra, edges with sixteen AlHo2Zr2Al8 cuboctahedra, faces with four equivalent HoAl12 cuboctahedra, and faces with fourteen AlZr4Al8 cuboctahedra. There are four shorter (2.99 Å) and four longer (3.01 Å) Al–Al bond lengths. In the third Al site, Al is bonded to four equivalent Ho and eight Al atoms to form distorted AlHo4Al8 cuboctahedra that share corners with twelve AlHo4Al8 cuboctahedra, edges with eight HoAl12 cuboctahedra, edges with sixteen AlHo4Al8 cuboctahedra, faces with four equivalent HoAl12 cuboctahedra, and faces with fourteen AlHo4Al8 cuboctahedra. There are four shorter (2.98 Å) and four longer (2.99 Å) Al–Al bond lengths. In the fourth Al site, Al is bonded to two equivalent Ho, two equivalent Zr, and eight Al atoms to form distorted AlHo2Zr2Al8 cuboctahedra that share corners with twelve AlHo2Zr2Al8 cuboctahedra, edges with four equivalent HoAl12 cuboctahedra, edges with four equivalent ZrAl12 cuboctahedra, edges with sixteen AlZr4Al8 cuboctahedra, faces with two equivalent HoAl12 cuboctahedra, faces with two equivalent ZrAl12 cuboctahedra, and faces with fourteen AlZr4Al8 cuboctahedra. All Al–Al bond lengths are 2.98 Å. In the fifth Al site, Al is bonded to four Ho and eight Al atoms to form distorted AlHo4Al8 cuboctahedra that share corners with twelve AlHo2Zr2Al8 cuboctahedra, edges with eight HoAl12 cuboctahedra, edges with sixteen AlHo4Al8 cuboctahedra, faces with four HoAl12 cuboctahedra, and faces with fourteen AlHo4Al8 cuboctahedra. All Al–Al bond lengths are 2.98 Å. In the sixth Al site, Al is bonded to four equivalent Ho and eight Al atoms to form distorted AlHo4Al8 cuboctahedra that share corners with twelve AlHo4Al8 cuboctahedra, edges with eight equivalent HoAl12 cuboctahedra, edges with sixteen AlHo4Al8 cuboctahedra, faces with four equivalent HoAl12 cuboctahedra, and faces with fourteen AlHo4Al8 cuboctahedra. All Al–Al bond lengths are 2.98 Å.