Eu(GaP)2 crystallizes in the monoclinic P2/m space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one P(2), one P(4), two equivalent P(1), and two equivalent P(3) atoms to form distorted EuP6 octahedra that share corners with four equivalent Ga(2)GaP3 tetrahedra, edges with two equivalent Eu(1)P6 octahedra, edges with two equivalent Eu(2)P6 octahedra, edges with two equivalent Eu(3)P6 octahedra, and edges with two equivalent Ga(1)GaP3 tetrahedra. In the second Eu site, Eu(2) is bonded to two equivalent P(3) and four equivalent P(4) atoms to form EuP6 octahedra that share corners with two equivalent Ga(2)GaP3 tetrahedra, corners with four equivalent Ga(1)GaP3 tetrahedra, edges with two equivalent Eu(2)P6 octahedra, edges with four equivalent Eu(1)P6 octahedra, and edges with two equivalent Ga(1)GaP3 tetrahedra. In the third Eu site, Eu(3) is bonded to two equivalent P(1) and four equivalent P(2) atoms to form EuP6 octahedra that share corners with two equivalent Ga(1)GaP3 tetrahedra, corners with four equivalent Ga(2)GaP3 tetrahedra, edges with two equivalent Eu(3)P6 octahedra, edges with four equivalent Eu(1)P6 octahedra, and edges with two equivalent Ga(2)GaP3 tetrahedra. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Ga(1), one P(1), and two equivalent P(4) atoms to form distorted GaGaP3 tetrahedra that share  a cornercorner with one Eu(3)P6 octahedra,  a cornercorner with one P(1)Eu3Ga3 octahedra, corners with two equivalent Eu(2)P6 octahedra, corners with two equivalent P(4)Eu3Ga3 octahedra, corners with two equivalent Ga(1)GaP3 tetrahedra,  an edgeedge with one Eu(2)P6 octahedra, and edges with two equivalent Eu(1)P6 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the second Ga site, Ga(2) is bonded to one Ga(2), one P(3), and two equivalent P(2) atoms to form distorted GaGaP3 tetrahedra that share  a cornercorner with one Eu(2)P6 octahedra,  a cornercorner with one P(3)Eu3Ga3 octahedra, corners with two equivalent Eu(3)P6 octahedra, corners with two equivalent P(2)Eu3Ga3 octahedra, corners with four equivalent Eu(1)P6 octahedra, corners with two equivalent Ga(2)GaP3 tetrahedra, and  an edgeedge with one Eu(3)P6 octahedra. The corner-sharing octahedral tilt angles range from 3-86°. In the third Ga site, Ga(3) is bonded in a 3-coordinate geometry to one P(2) and two equivalent P(1) atoms. In the fourth Ga site, Ga(4) is bonded in a 3-coordinate geometry to one P(4) and two equivalent P(3) atoms. There are four inequivalent P sites. In the first P site, P(1) is bonded to one Eu(3), two equivalent Eu(1), one Ga(1), and two equivalent Ga(3) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(1)Eu3Ga3 octahedra, corners with two equivalent P(3)Eu3Ga3 octahedra,  a cornercorner with one Ga(1)GaP3 tetrahedra,  an edgeedge with one P(3)Eu3Ga3 octahedra, edges with two equivalent P(1)Eu3Ga3 octahedra, edges with two equivalent P(4)Eu3Ga3 octahedra, and edges with four equivalent P(2)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second P site, P(2) is bonded to one Eu(1), two equivalent Eu(3), one Ga(3), and two equivalent Ga(2) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(4)Eu3Ga3 octahedra, corners with two equivalent P(2)Eu3Ga3 octahedra, corners with four equivalent P(3)Eu3Ga3 octahedra, corners with two equivalent Ga(2)GaP3 tetrahedra, edges with three equivalent P(2)Eu3Ga3 octahedra, and edges with four equivalent P(1)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. In the third P site, P(3) is bonded to one Eu(2), two equivalent Eu(1), one Ga(2), and two equivalent Ga(4) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(3)Eu3Ga3 octahedra, corners with two equivalent P(1)Eu3Ga3 octahedra, corners with four equivalent P(2)Eu3Ga3 octahedra,  a cornercorner with one Ga(2)GaP3 tetrahedra,  an edgeedge with one P(1)Eu3Ga3 octahedra, edges with two equivalent P(3)Eu3Ga3 octahedra, and edges with four equivalent P(4)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. In the fourth P site, P(4) is bonded to one Eu(1), two equivalent Eu(2), one Ga(4), and two equivalent Ga(1) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(2)Eu3Ga3 octahedra, corners with two equivalent P(4)Eu3Ga3 octahedra, corners with two equivalent Ga(1)GaP3 tetrahedra, edges with two equivalent P(1)Eu3Ga3 octahedra, edges with three equivalent P(4)Eu3Ga3 octahedra, and edges with four equivalent P(3)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-19°.
Eu(GaP)2 crystallizes in the monoclinic P2/m space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one P(2), one P(4), two equivalent P(1), and two equivalent P(3) atoms to form distorted EuP6 octahedra that share corners with four equivalent Ga(2)GaP3 tetrahedra, edges with two equivalent Eu(1)P6 octahedra, edges with two equivalent Eu(2)P6 octahedra, edges with two equivalent Eu(3)P6 octahedra, and edges with two equivalent Ga(1)GaP3 tetrahedra. The Eu(1)-P(2) bond length is 3.10 Å. The Eu(1)-P(4) bond length is 3.11 Å. Both Eu(1)-P(1) bond lengths are 3.03 Å. Both Eu(1)-P(3) bond lengths are 3.03 Å. In the second Eu site, Eu(2) is bonded to two equivalent P(3) and four equivalent P(4) atoms to form EuP6 octahedra that share corners with two equivalent Ga(2)GaP3 tetrahedra, corners with four equivalent Ga(1)GaP3 tetrahedra, edges with two equivalent Eu(2)P6 octahedra, edges with four equivalent Eu(1)P6 octahedra, and edges with two equivalent Ga(1)GaP3 tetrahedra. Both Eu(2)-P(3) bond lengths are 2.99 Å. All Eu(2)-P(4) bond lengths are 2.94 Å. In the third Eu site, Eu(3) is bonded to two equivalent P(1) and four equivalent P(2) atoms to form EuP6 octahedra that share corners with two equivalent Ga(1)GaP3 tetrahedra, corners with four equivalent Ga(2)GaP3 tetrahedra, edges with two equivalent Eu(3)P6 octahedra, edges with four equivalent Eu(1)P6 octahedra, and edges with two equivalent Ga(2)GaP3 tetrahedra. Both Eu(3)-P(1) bond lengths are 2.93 Å. All Eu(3)-P(2) bond lengths are 2.99 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Ga(1), one P(1), and two equivalent P(4) atoms to form distorted GaGaP3 tetrahedra that share  a cornercorner with one Eu(3)P6 octahedra,  a cornercorner with one P(1)Eu3Ga3 octahedra, corners with two equivalent Eu(2)P6 octahedra, corners with two equivalent P(4)Eu3Ga3 octahedra, corners with two equivalent Ga(1)GaP3 tetrahedra,  an edgeedge with one Eu(2)P6 octahedra, and edges with two equivalent Eu(1)P6 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. The Ga(1)-Ga(1) bond length is 2.46 Å. The Ga(1)-P(1) bond length is 2.42 Å. Both Ga(1)-P(4) bond lengths are 2.43 Å. In the second Ga site, Ga(2) is bonded to one Ga(2), one P(3), and two equivalent P(2) atoms to form distorted GaGaP3 tetrahedra that share  a cornercorner with one Eu(2)P6 octahedra,  a cornercorner with one P(3)Eu3Ga3 octahedra, corners with two equivalent Eu(3)P6 octahedra, corners with two equivalent P(2)Eu3Ga3 octahedra, corners with four equivalent Eu(1)P6 octahedra, corners with two equivalent Ga(2)GaP3 tetrahedra, and  an edgeedge with one Eu(3)P6 octahedra. The corner-sharing octahedral tilt angles range from 3-86°. The Ga(2)-Ga(2) bond length is 2.48 Å. The Ga(2)-P(3) bond length is 2.46 Å. Both Ga(2)-P(2) bond lengths are 2.45 Å. In the third Ga site, Ga(3) is bonded in a 3-coordinate geometry to one P(2) and two equivalent P(1) atoms. The Ga(3)-P(2) bond length is 2.45 Å. Both Ga(3)-P(1) bond lengths are 2.42 Å. In the fourth Ga site, Ga(4) is bonded in a 3-coordinate geometry to one P(4) and two equivalent P(3) atoms. The Ga(4)-P(4) bond length is 2.41 Å. Both Ga(4)-P(3) bond lengths are 2.44 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one Eu(3), two equivalent Eu(1), one Ga(1), and two equivalent Ga(3) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(1)Eu3Ga3 octahedra, corners with two equivalent P(3)Eu3Ga3 octahedra,  a cornercorner with one Ga(1)GaP3 tetrahedra,  an edgeedge with one P(3)Eu3Ga3 octahedra, edges with two equivalent P(1)Eu3Ga3 octahedra, edges with two equivalent P(4)Eu3Ga3 octahedra, and edges with four equivalent P(2)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second P site, P(2) is bonded to one Eu(1), two equivalent Eu(3), one Ga(3), and two equivalent Ga(2) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(4)Eu3Ga3 octahedra, corners with two equivalent P(2)Eu3Ga3 octahedra, corners with four equivalent P(3)Eu3Ga3 octahedra, corners with two equivalent Ga(2)GaP3 tetrahedra, edges with three equivalent P(2)Eu3Ga3 octahedra, and edges with four equivalent P(1)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. In the third P site, P(3) is bonded to one Eu(2), two equivalent Eu(1), one Ga(2), and two equivalent Ga(4) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(3)Eu3Ga3 octahedra, corners with two equivalent P(1)Eu3Ga3 octahedra, corners with four equivalent P(2)Eu3Ga3 octahedra,  a cornercorner with one Ga(2)GaP3 tetrahedra,  an edgeedge with one P(1)Eu3Ga3 octahedra, edges with two equivalent P(3)Eu3Ga3 octahedra, and edges with four equivalent P(4)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. In the fourth P site, P(4) is bonded to one Eu(1), two equivalent Eu(2), one Ga(4), and two equivalent Ga(1) atoms to form PEu3Ga3 octahedra that share  a cornercorner with one P(2)Eu3Ga3 octahedra, corners with two equivalent P(4)Eu3Ga3 octahedra, corners with two equivalent Ga(1)GaP3 tetrahedra, edges with two equivalent P(1)Eu3Ga3 octahedra, edges with three equivalent P(4)Eu3Ga3 octahedra, and edges with four equivalent P(3)Eu3Ga3 octahedra. The corner-sharing octahedral tilt angles range from 0-19°.