CaBeEu2O5 crystallizes in the orthorhombic Pna2_1 space group. Ca(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. Be(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(4), and one O(5) atom. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ca(1), one Be(1), one Eu(1), and two equivalent Eu(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Ca(1), one Be(1), one Eu(1), and two equivalent Eu(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ca(1), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ca(1), one Be(1), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to two equivalent Ca(1), one Be(1), one Eu(2), and two equivalent Eu(1) atoms.
CaBeEu2O5 crystallizes in the orthorhombic Pna2_1 space group. Ca(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. The Ca(1)-O(4) bond length is 2.81 Å. There is one shorter (2.50 Å) and one longer (2.51 Å) Ca(1)-O(1) bond length. There is one shorter (2.51 Å) and one longer (2.59 Å) Ca(1)-O(2) bond length. There is one shorter (2.49 Å) and one longer (2.59 Å) Ca(1)-O(3) bond length. There is one shorter (2.52 Å) and one longer (2.80 Å) Ca(1)-O(5) bond length. Be(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(4), and one O(5) atom. The Be(1)-O(1) bond length is 1.64 Å. The Be(1)-O(2) bond length is 1.68 Å. The Be(1)-O(4) bond length is 1.61 Å. The Be(1)-O(5) bond length is 1.61 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Eu(1)-O(1) bond length is 2.55 Å. The Eu(1)-O(2) bond length is 2.43 Å. There is one shorter (2.38 Å) and one longer (2.89 Å) Eu(1)-O(3) bond length. There is one shorter (2.35 Å) and one longer (2.43 Å) Eu(1)-O(4) bond length. There is one shorter (2.32 Å) and one longer (2.47 Å) Eu(1)-O(5) bond length. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Eu(2)-O(5) bond length is 2.78 Å. There is one shorter (2.48 Å) and one longer (2.52 Å) Eu(2)-O(1) bond length. There is one shorter (2.50 Å) and one longer (2.61 Å) Eu(2)-O(2) bond length. There is one shorter (2.45 Å) and one longer (2.63 Å) Eu(2)-O(3) bond length. There is one shorter (2.53 Å) and one longer (2.80 Å) Eu(2)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Ca(1), one Be(1), one Eu(1), and two equivalent Eu(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Ca(1), one Be(1), one Eu(1), and two equivalent Eu(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ca(1), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ca(1), one Be(1), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to two equivalent Ca(1), one Be(1), one Eu(2), and two equivalent Eu(1) atoms.