EuFCl is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 9-coordinate geometry to five equivalent Cl(1) and four equivalent F(1) atoms. Cl(1) is bonded to five equivalent Eu(1) atoms to form distorted ClEu5 trigonal bipyramids that share corners with twelve equivalent F(1)Eu4 tetrahedra, corners with four equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with eight equivalent Cl(1)Eu5 trigonal bipyramids. F(1) is bonded to four equivalent Eu(1) atoms to form FEu4 tetrahedra that share corners with four equivalent F(1)Eu4 tetrahedra, corners with twelve equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with four equivalent Cl(1)Eu5 trigonal bipyramids.
EuFCl is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 9-coordinate geometry to five equivalent Cl(1) and four equivalent F(1) atoms. There is one shorter (3.06 Å) and four longer (3.07 Å) Eu(1)-Cl(1) bond lengths. All Eu(1)-F(1) bond lengths are 2.50 Å. Cl(1) is bonded to five equivalent Eu(1) atoms to form distorted ClEu5 trigonal bipyramids that share corners with twelve equivalent F(1)Eu4 tetrahedra, corners with four equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with eight equivalent Cl(1)Eu5 trigonal bipyramids. F(1) is bonded to four equivalent Eu(1) atoms to form FEu4 tetrahedra that share corners with four equivalent F(1)Eu4 tetrahedra, corners with twelve equivalent Cl(1)Eu5 trigonal bipyramids, edges with four equivalent F(1)Eu4 tetrahedra, and edges with four equivalent Cl(1)Eu5 trigonal bipyramids.