BaSrBe2La4O10 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and two equivalent O(10) atoms. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a tetrahedral geometry to one O(10), one O(3), one O(6), and one O(8) atom. In the second Be site, Be(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(7), and one O(9) atom. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(4), two equivalent O(6), and two equivalent O(8) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(9), two equivalent O(5), and two equivalent O(7) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and two equivalent O(9) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Be(2), one La(2), and two equivalent La(3) atoms. In the second O site, O(10) is bonded in a distorted single-bond geometry to two equivalent Ba(1), one Be(1), one La(1), and two equivalent La(4) atoms. In the third O site, O(1) is bonded in a 6-coordinate geometry to one Ba(1), one Sr(1), one La(1), one La(2), one La(3), and one La(4) atom. In the fourth O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Sr(1), one La(1), one La(2), one La(3), and one La(4) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1), one Sr(1), one Be(1), one La(2), one La(3), and one La(4) atom. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Sr(1), one Be(2), one La(1), one La(3), and one La(4) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Be(2), one La(3), one La(4), and two equivalent La(2) atoms. In the eighth O site, O(6) is bonded in a 1-coordinate geometry to one Ba(1), one Sr(1), one Be(1), one La(4), and two equivalent La(1) atoms. In the ninth O site, O(7) is bonded in a 1-coordinate geometry to one Ba(1), one Sr(1), one Be(2), one La(3), and two equivalent La(2) atoms. In the tenth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(1), one Be(1), one La(3), one La(4), and two equivalent La(1) atoms.
BaSrBe2La4O10 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and two equivalent O(10) atoms. The Ba(1)-O(1) bond length is 2.74 Å. The Ba(1)-O(2) bond length is 2.68 Å. The Ba(1)-O(3) bond length is 2.74 Å. The Ba(1)-O(4) bond length is 2.71 Å. The Ba(1)-O(6) bond length is 2.86 Å. The Ba(1)-O(7) bond length is 2.72 Å. The Ba(1)-O(8) bond length is 2.98 Å. There is one shorter (2.62 Å) and one longer (2.63 Å) Ba(1)-O(10) bond length. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. The Sr(1)-O(1) bond length is 2.57 Å. The Sr(1)-O(2) bond length is 2.57 Å. The Sr(1)-O(3) bond length is 2.56 Å. The Sr(1)-O(4) bond length is 2.57 Å. The Sr(1)-O(5) bond length is 2.94 Å. The Sr(1)-O(6) bond length is 2.66 Å. The Sr(1)-O(7) bond length is 2.80 Å. There is one shorter (2.60 Å) and one longer (2.61 Å) Sr(1)-O(9) bond length. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a tetrahedral geometry to one O(10), one O(3), one O(6), and one O(8) atom. The Be(1)-O(10) bond length is 1.67 Å. The Be(1)-O(3) bond length is 1.72 Å. The Be(1)-O(6) bond length is 1.63 Å. The Be(1)-O(8) bond length is 1.66 Å. In the second Be site, Be(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(7), and one O(9) atom. The Be(2)-O(4) bond length is 1.72 Å. The Be(2)-O(5) bond length is 1.65 Å. The Be(2)-O(7) bond length is 1.64 Å. The Be(2)-O(9) bond length is 1.66 Å. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(4), two equivalent O(6), and two equivalent O(8) atoms. The La(1)-O(1) bond length is 2.47 Å. The La(1)-O(10) bond length is 2.69 Å. The La(1)-O(2) bond length is 3.10 Å. The La(1)-O(4) bond length is 2.53 Å. There is one shorter (2.42 Å) and one longer (2.56 Å) La(1)-O(6) bond length. There is one shorter (2.48 Å) and one longer (2.50 Å) La(1)-O(8) bond length. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(9), two equivalent O(5), and two equivalent O(7) atoms. The La(2)-O(1) bond length is 3.02 Å. The La(2)-O(2) bond length is 2.39 Å. The La(2)-O(3) bond length is 2.62 Å. The La(2)-O(9) bond length is 2.66 Å. There is one shorter (2.47 Å) and one longer (2.50 Å) La(2)-O(5) bond length. There is one shorter (2.43 Å) and one longer (2.60 Å) La(2)-O(7) bond length. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and two equivalent O(9) atoms. The La(3)-O(1) bond length is 2.49 Å. The La(3)-O(2) bond length is 2.95 Å. The La(3)-O(3) bond length is 2.65 Å. The La(3)-O(4) bond length is 2.70 Å. The La(3)-O(5) bond length is 2.86 Å. The La(3)-O(7) bond length is 2.79 Å. The La(3)-O(8) bond length is 2.67 Å. There is one shorter (2.43 Å) and one longer (2.68 Å) La(3)-O(9) bond length. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms. The La(4)-O(1) bond length is 2.75 Å. The La(4)-O(2) bond length is 2.44 Å. The La(4)-O(3) bond length is 2.61 Å. The La(4)-O(4) bond length is 2.70 Å. The La(4)-O(5) bond length is 2.70 Å. The La(4)-O(6) bond length is 2.88 Å. The La(4)-O(8) bond length is 2.95 Å. There is one shorter (2.60 Å) and one longer (2.61 Å) La(4)-O(10) bond length. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Be(2), one La(2), and two equivalent La(3) atoms. In the second O site, O(10) is bonded in a distorted single-bond geometry to two equivalent Ba(1), one Be(1), one La(1), and two equivalent La(4) atoms. In the third O site, O(1) is bonded in a 6-coordinate geometry to one Ba(1), one Sr(1), one La(1), one La(2), one La(3), and one La(4) atom. In the fourth O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Sr(1), one La(1), one La(2), one La(3), and one La(4) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one Ba(1), one Sr(1), one Be(1), one La(2), one La(3), and one La(4) atom. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Sr(1), one Be(2), one La(1), one La(3), and one La(4) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Be(2), one La(3), one La(4), and two equivalent La(2) atoms. In the eighth O site, O(6) is bonded in a 1-coordinate geometry to one Ba(1), one Sr(1), one Be(1), one La(4), and two equivalent La(1) atoms. In the ninth O site, O(7) is bonded in a 1-coordinate geometry to one Ba(1), one Sr(1), one Be(2), one La(3), and two equivalent La(2) atoms. In the tenth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(1), one Be(1), one La(3), one La(4), and two equivalent La(1) atoms.