FeNi9Ga2 is beta Cu3Ti-derived structured and crystallizes in the tetragonal P4/mmm space group. Fe(1) is bonded to four equivalent Ni(1) and eight equivalent Ni(3) atoms to form FeNi12 cuboctahedra that share corners with four equivalent Fe(1)Ni12 cuboctahedra, corners with eight equivalent Ga(1)Ni12 cuboctahedra, edges with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with sixteen equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with two equivalent Ga(1)Ni12 cuboctahedra, faces with four equivalent Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(1)Fe4Ni8 cuboctahedra, and faces with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Fe(1) and eight equivalent Ni(3) atoms to form NiFe4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Fe4Ni8 cuboctahedra, corners with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ga(1)Ni12 cuboctahedra, edges with sixteen equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with two equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(1)Fe4Ni8 cuboctahedra, and faces with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to four equivalent Ni(3), four equivalent Ni(4), and four equivalent Ga(1) atoms to form NiGa4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Fe4Ni8 cuboctahedra, corners with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with four equivalent Fe(1)Ni12 cuboctahedra, edges with four equivalent Ga(1)Ni12 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(4)Ga4Ni8 cuboctahedra,  a faceface with one Ni(1)Fe4Ni8 cuboctahedra, faces with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(4)Ga4Ni8 cuboctahedra, faces with four equivalent Ga(1)Ni12 cuboctahedra, and faces with five equivalent Ni(2)Ga4Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Fe(1), two equivalent Ni(1), two equivalent Ni(2), four equivalent Ni(3), and two equivalent Ga(1) atoms to form NiGa2Fe2Ni8 cuboctahedra that share corners with four equivalent Ni(4)Ga4Ni8 cuboctahedra, corners with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with four equivalent Fe(1)Ni12 cuboctahedra, edges with four equivalent Ni(1)Fe4Ni8 cuboctahedra, edges with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with four equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with four equivalent Ni(4)Ga4Ni8 cuboctahedra, edges with four equivalent Ga(1)Ni12 cuboctahedra,  a faceface with one Ni(4)Ga4Ni8 cuboctahedra, faces with two equivalent Fe(1)Ni12 cuboctahedra, faces with two equivalent Ni(1)Fe4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with two equivalent Ga(1)Ni12 cuboctahedra, and faces with nine equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to four equivalent Ni(2), four equivalent Ni(4), and four equivalent Ga(1) atoms to form NiGa4Ni8 cuboctahedra that share corners with four equivalent Ni(4)Ga4Ni8 cuboctahedra, corners with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ga(1)Ni12 cuboctahedra, faces with two equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Ga(1)Ni12 cuboctahedra, and faces with eight equivalent Ni(4)Ga4Ni8 cuboctahedra. Ga(1) is bonded to four equivalent Ni(2), four equivalent Ni(3), and four equivalent Ni(4) atoms to form GaNi12 cuboctahedra that share corners with four equivalent Fe(1)Ni12 cuboctahedra, corners with eight equivalent Ga(1)Ni12 cuboctahedra, edges with four equivalent Ni(1)Fe4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(4)Ga4Ni8 cuboctahedra,  a faceface with one Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Ni(4)Ga4Ni8 cuboctahedra, and faces with five equivalent Ga(1)Ni12 cuboctahedra.
FeNi9Ga2 is beta Cu3Ti-derived structured and crystallizes in the tetragonal P4/mmm space group. Fe(1) is bonded to four equivalent Ni(1) and eight equivalent Ni(3) atoms to form FeNi12 cuboctahedra that share corners with four equivalent Fe(1)Ni12 cuboctahedra, corners with eight equivalent Ga(1)Ni12 cuboctahedra, edges with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with sixteen equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with two equivalent Ga(1)Ni12 cuboctahedra, faces with four equivalent Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(1)Fe4Ni8 cuboctahedra, and faces with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. All Fe(1)-Ni(1) bond lengths are 2.51 Å. All Fe(1)-Ni(3) bond lengths are 2.45 Å. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Fe(1) and eight equivalent Ni(3) atoms to form NiFe4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Fe4Ni8 cuboctahedra, corners with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ga(1)Ni12 cuboctahedra, edges with sixteen equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with two equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(1)Fe4Ni8 cuboctahedra, and faces with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. All Ni(1)-Ni(3) bond lengths are 2.45 Å. In the second Ni site, Ni(2) is bonded to four equivalent Ni(3), four equivalent Ni(4), and four equivalent Ga(1) atoms to form NiGa4Ni8 cuboctahedra that share corners with four equivalent Ni(1)Fe4Ni8 cuboctahedra, corners with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with four equivalent Fe(1)Ni12 cuboctahedra, edges with four equivalent Ga(1)Ni12 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(4)Ga4Ni8 cuboctahedra,  a faceface with one Ni(1)Fe4Ni8 cuboctahedra, faces with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(4)Ga4Ni8 cuboctahedra, faces with four equivalent Ga(1)Ni12 cuboctahedra, and faces with five equivalent Ni(2)Ga4Ni8 cuboctahedra. All Ni(2)-Ni(3) bond lengths are 2.54 Å. All Ni(2)-Ni(4) bond lengths are 2.53 Å. All Ni(2)-Ga(1) bond lengths are 2.51 Å. In the third Ni site, Ni(3) is bonded to two equivalent Fe(1), two equivalent Ni(1), two equivalent Ni(2), four equivalent Ni(3), and two equivalent Ga(1) atoms to form NiGa2Fe2Ni8 cuboctahedra that share corners with four equivalent Ni(4)Ga4Ni8 cuboctahedra, corners with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with four equivalent Fe(1)Ni12 cuboctahedra, edges with four equivalent Ni(1)Fe4Ni8 cuboctahedra, edges with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with four equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with four equivalent Ni(4)Ga4Ni8 cuboctahedra, edges with four equivalent Ga(1)Ni12 cuboctahedra,  a faceface with one Ni(4)Ga4Ni8 cuboctahedra, faces with two equivalent Fe(1)Ni12 cuboctahedra, faces with two equivalent Ni(1)Fe4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with two equivalent Ga(1)Ni12 cuboctahedra, and faces with nine equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra. All Ni(3)-Ni(3) bond lengths are 2.51 Å. Both Ni(3)-Ga(1) bond lengths are 2.56 Å. In the fourth Ni site, Ni(4) is bonded to four equivalent Ni(2), four equivalent Ni(4), and four equivalent Ga(1) atoms to form NiGa4Ni8 cuboctahedra that share corners with four equivalent Ni(4)Ga4Ni8 cuboctahedra, corners with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ga(1)Ni12 cuboctahedra, faces with two equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Ga(1)Ni12 cuboctahedra, and faces with eight equivalent Ni(4)Ga4Ni8 cuboctahedra. All Ni(4)-Ni(4) bond lengths are 2.51 Å. All Ni(4)-Ga(1) bond lengths are 2.51 Å. Ga(1) is bonded to four equivalent Ni(2), four equivalent Ni(3), and four equivalent Ni(4) atoms to form GaNi12 cuboctahedra that share corners with four equivalent Fe(1)Ni12 cuboctahedra, corners with eight equivalent Ga(1)Ni12 cuboctahedra, edges with four equivalent Ni(1)Fe4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ga4Ni8 cuboctahedra, edges with eight equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, edges with eight equivalent Ni(4)Ga4Ni8 cuboctahedra,  a faceface with one Fe(1)Ni12 cuboctahedra, faces with four equivalent Ni(3)Ga2Fe2Ni8 cuboctahedra, faces with four equivalent Ni(2)Ga4Ni8 cuboctahedra, faces with four equivalent Ni(4)Ga4Ni8 cuboctahedra, and faces with five equivalent Ga(1)Ni12 cuboctahedra.