EuH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent H(1) and five equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(2) is bonded to five equivalent Eu(1) atoms to form distorted HEu5 square pyramids that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with six equivalent H(1)Eu4 tetrahedra. In the second H site, H(1) is bonded to four equivalent Eu(1) atoms to form HEu4 tetrahedra that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with two equivalent H(1)Eu4 tetrahedra.
EuH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent H(1) and five equivalent H(2) atoms. There are a spread of Eu(1)-H(1) bond distances ranging from 2.35-2.38 Å. There are a spread of Eu(1)-H(2) bond distances ranging from 2.52-2.69 Å. There are two inequivalent H sites. In the first H site, H(2) is bonded to five equivalent Eu(1) atoms to form distorted HEu5 square pyramids that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with six equivalent H(1)Eu4 tetrahedra. In the second H site, H(1) is bonded to four equivalent Eu(1) atoms to form HEu4 tetrahedra that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with two equivalent H(1)Eu4 tetrahedra.