BaH2SiO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one H(3), one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. In the second Ba site, Ba(2) 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(7) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(7) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(5), one O(6), and one O(8) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(3) and one O(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Ba(1) and one O(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(1), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(1), and one H(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Si(2), and one H(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(2), and one H(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(2), and one H(2) atom.
BaH2SiO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one H(3), one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. The Ba(1)-H(3) bond length is 2.86 Å. The Ba(1)-O(1) bond length is 2.87 Å. The Ba(1)-O(3) bond length is 3.23 Å. The Ba(1)-O(4) bond length is 2.86 Å. The Ba(1)-O(5) bond length is 2.97 Å. The Ba(1)-O(6) bond length is 2.85 Å. The Ba(1)-O(7) bond length is 2.91 Å. The Ba(1)-O(8) bond length is 3.20 Å. There is one shorter (2.65 Å) and one longer (2.81 Å) Ba(1)-O(2) bond length. In the second Ba site, Ba(2) 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(7) atoms. The Ba(2)-O(1) bond length is 2.88 Å. The Ba(2)-O(2) bond length is 3.05 Å. The Ba(2)-O(3) bond length is 2.92 Å. The Ba(2)-O(4) bond length is 2.86 Å. The Ba(2)-O(5) bond length is 3.00 Å. The Ba(2)-O(6) bond length is 2.81 Å. The Ba(2)-O(8) bond length is 3.09 Å. There is one shorter (2.66 Å) and one longer (2.85 Å) Ba(2)-O(7) bond length. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(7) atom. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.68 Å. The Si(1)-O(4) bond length is 1.72 Å. The Si(1)-O(7) bond length is 1.61 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(5), one O(6), and one O(8) atom. The Si(2)-O(2) bond length is 1.60 Å. The Si(2)-O(5) bond length is 1.73 Å. The Si(2)-O(6) bond length is 1.62 Å. The Si(2)-O(8) bond length is 1.68 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(3) and one O(6) atom. The H(1)-O(3) bond length is 1.03 Å. The H(1)-O(6) bond length is 1.58 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. The H(2)-O(8) bond length is 1.01 Å. In the third H site, H(3) is bonded in a single-bond geometry to one Ba(1) and one O(5) atom. The H(3)-O(5) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. The H(4)-O(4) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(1), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(1), and one H(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Si(2), and one H(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(2), and one H(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1), two equivalent Ba(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ba(1), one Ba(2), one Si(2), and one H(2) atom.