Eu(Ni3S4)2 crystallizes in the trigonal R-3 space group. Eu(1) is bonded in a body-centered cubic geometry to two equivalent S(2) and six equivalent S(1) atoms. Ni(1) is bonded to one S(2) and four equivalent S(1) atoms to form a mixture of distorted edge and corner-sharing NiS5 trigonal bipyramids. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Eu(1) and four equivalent Ni(1) atoms. In the second S site, S(2) is bonded in a 4-coordinate geometry to one Eu(1) and three equivalent Ni(1) atoms.
Eu(Ni3S4)2 crystallizes in the trigonal R-3 space group. Eu(1) is bonded in a body-centered cubic geometry to two equivalent S(2) and six equivalent S(1) atoms. Both Eu(1)-S(2) bond lengths are 2.78 Å. All Eu(1)-S(1) bond lengths are 3.05 Å. Ni(1) is bonded to one S(2) and four equivalent S(1) atoms to form a mixture of distorted edge and corner-sharing NiS5 trigonal bipyramids. The Ni(1)-S(2) bond length is 2.21 Å. There are a spread of Ni(1)-S(1) bond distances ranging from 2.23-2.32 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to one Eu(1) and four equivalent Ni(1) atoms. In the second S site, S(2) is bonded in a 4-coordinate geometry to one Eu(1) and three equivalent Ni(1) atoms.