Eu2FePt7P3 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), five equivalent Pt(3), two equivalent P(2), and four equivalent P(1) atoms. Fe(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(4) atoms to form FePt12 cuboctahedra that share corners with four equivalent Fe(1)Pt12 cuboctahedra, faces with four equivalent Fe(1)Pt12 cuboctahedra, and faces with four equivalent Pt(4)Fe4Pt8 cuboctahedra. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Fe(1), two equivalent Pt(4), four equivalent Pt(2), and two equivalent P(1) atoms. In the second Pt site, Pt(2) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Fe(1), two equivalent Pt(4), four equivalent Pt(1), and two equivalent P(1) atoms. In the third Pt site, Pt(3) is bonded in a 7-coordinate geometry to five equivalent Eu(1), one P(1), and two equivalent P(2) atoms. In the fourth Pt site, Pt(4) is bonded to four equivalent Fe(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form PtFe4Pt8 cuboctahedra that share corners with four equivalent Pt(4)Fe4Pt8 cuboctahedra, faces with four equivalent Fe(1)Pt12 cuboctahedra, and faces with four equivalent Pt(4)Fe4Pt8 cuboctahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the second P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the third P site, P(2) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Pt(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms.
Eu2FePt7P3 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 15-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), five equivalent Pt(3), two equivalent P(2), and four equivalent P(1) atoms. Both Eu(1)-Pt(1) bond lengths are 3.27 Å. Both Eu(1)-Pt(2) bond lengths are 3.26 Å. There are four shorter (3.10 Å) and one longer (3.46 Å) Eu(1)-Pt(3) bond length. Both Eu(1)-P(2) bond lengths are 3.07 Å. All Eu(1)-P(1) bond lengths are 3.13 Å. Fe(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(4) atoms to form FePt12 cuboctahedra that share corners with four equivalent Fe(1)Pt12 cuboctahedra, faces with four equivalent Fe(1)Pt12 cuboctahedra, and faces with four equivalent Pt(4)Fe4Pt8 cuboctahedra. All Fe(1)-Pt(1) bond lengths are 2.79 Å. All Fe(1)-Pt(2) bond lengths are 2.79 Å. All Fe(1)-Pt(4) bond lengths are 2.89 Å. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Fe(1), two equivalent Pt(4), four equivalent Pt(2), and two equivalent P(1) atoms. Both Pt(1)-Pt(4) bond lengths are 2.79 Å. All Pt(1)-Pt(2) bond lengths are 2.89 Å. Both Pt(1)-P(1) bond lengths are 2.44 Å. In the second Pt site, Pt(2) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Fe(1), two equivalent Pt(4), four equivalent Pt(1), and two equivalent P(1) atoms. Both Pt(2)-Pt(4) bond lengths are 2.79 Å. Both Pt(2)-P(1) bond lengths are 2.43 Å. In the third Pt site, Pt(3) is bonded in a 7-coordinate geometry to five equivalent Eu(1), one P(1), and two equivalent P(2) atoms. The Pt(3)-P(1) bond length is 2.36 Å. Both Pt(3)-P(2) bond lengths are 2.35 Å. In the fourth Pt site, Pt(4) is bonded to four equivalent Fe(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form PtFe4Pt8 cuboctahedra that share corners with four equivalent Pt(4)Fe4Pt8 cuboctahedra, faces with four equivalent Fe(1)Pt12 cuboctahedra, and faces with four equivalent Pt(4)Fe4Pt8 cuboctahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. All P(1)-Eu(1) bond lengths are 3.13 Å. In the second P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. The P(1)-Pt(3) bond length is 2.36 Å. Both P(1)-Pt(1) bond lengths are 2.44 Å. Both P(1)-Pt(2) bond lengths are 2.43 Å. In the third P site, P(2) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Pt(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. All P(1)-Eu(1) bond lengths are 3.13 Å. The P(1)-Pt(3) bond length is 2.36 Å. Both P(1)-Pt(1) bond lengths are 2.44 Å. Both P(1)-Pt(2) bond lengths are 2.43 Å.