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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaHf4(NCl)4 by Materials Project

NaHf4(NCl)4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Na is bonded to six Cl atoms to form edge-sharing NaCl6 octahedra. There are four shorter (2.76 Å) and two longer (2.80 Å) Na–Cl bond lengths. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are one shorter (2.13 Å) and three longer (2.14 Å) Hf–N bond lengths. There are two shorter (2.86 Å) and one longer (2.92 Å) Hf–Cl bond lengths. In the second Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.86 Å) and two longer (2.94 Å) Hf–Cl bond lengths. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with four equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, an edgeedge with one ClNa2Hf3 square pyramid, and edges with three NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with two equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with two equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms. In the second Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with two equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with three equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf8(NCl)8 by Materials Project

NaHf8(NCl)8 crystallizes in the monoclinic P2/m space group. The structure is two-dimensional and consists of one NaHf8(NCl)8 sheet oriented in the (0, 0, 1) direction. Na is bonded to six Cl atoms to form edge-sharing NaCl6 octahedra. There are four shorter (2.75 Å) and two longer (2.77 Å) Na–Cl bond lengths. There are four inequivalent Hf sites. In the first Hf site, Hf is bonded in a 7-coordinate geometry to four N and three Cl atoms. There are three shorter (2.13 Å) and one longer (2.19 Å) Hf–N bond lengths. There are one shorter (2.75 Å) and two longer (2.77 Å) Hf–Cl bond lengths. In the second Hf site, Hf is bonded in a 7-coordinate geometry to four N and three Cl atoms. There are three shorter (2.13 Å) and one longer (2.19 Å) Hf–N bond lengths. There are one shorter (2.75 Å) and two longer (2.78 Å) Hf–Cl bond lengths. In the third Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are one shorter (2.10 Å) and three longer (2.11 Å) Hf–N bond lengths. There are one shorter (2.85 Å) and two longer (2.92 Å) Hf–Cl bond lengths. In the fourth Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are one shorter (2.11 Å) and three longer (2.12 Å) Hf–N bond lengths. There are two shorter (2.87 Å) and one longer (2.88 Å) Hf–Cl bond lengths. There are four inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with three equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, an edgeedge with one ClNa2Hf3 square pyramid, and edges with three NHf4 tetrahedra. In the second N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with six NHf4 trigonal pyramids, edges with two equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 tetrahedra. In the third N site, N is bonded to four Hf atoms to form NHf4 tetrahedra that share corners with two equivalent ClNa2Hf3 square pyramids, corners with six NHf4 tetrahedra, and edges with three NHf4 trigonal pyramids. In the fourth N site, N is bonded to four Hf atoms to form NHf4 tetrahedra that share a cornercorner with one ClNa2Hf3 square pyramid, corners with six NHf4 tetrahedra, and edges with three NHf4 trigonal pyramids. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with two equivalent ClNa2Hf3 square pyramids, corners with three NHf4 tetrahedra, corners with three equivalent NHf4 trigonal pyramids, edges with three equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. In the second Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms. In the third Cl site, Cl is bonded in a 3-coordinate geometry to three Hf atoms. In the fourth Cl site, Cl is bonded in a 3-coordinate geometry to three Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf3(NCl)3 by Materials Project

NaHf3(NCl)3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na is bonded to six Cl atoms to form NaCl6 octahedra that share corners with six HfN4Cl3 trigonal pyramids, edges with three equivalent NaCl6 octahedra, and edges with six HfN4Cl3 trigonal pyramids. All Na–Cl bond lengths are 2.80 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded to four N and three Cl atoms to form distorted HfN4Cl3 trigonal pyramids that share corners with two equivalent NaCl6 octahedra, edges with two equivalent NaCl6 octahedra, and edges with nine HfN4Cl3 trigonal pyramids. The corner-sharing octahedral tilt angles are 3°. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.93 Å) and two longer (2.96 Å) Hf–Cl bond lengths. In the second Hf site, Hf is bonded to four N and three Cl atoms to form distorted HfN4Cl3 trigonal pyramids that share corners with two equivalent NaCl6 octahedra, edges with two equivalent NaCl6 octahedra, and edges with nine HfN4Cl3 trigonal pyramids. The corner-sharing octahedral tilt angles are 3°. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.93 Å) and two longer (2.95 Å) Hf–Cl bond lengths. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six equivalent NHf4 trigonal pyramids, edges with three ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with three ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with five ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. In the second Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with six equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with five ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf6(NCl)6 by Materials Project

NaHf6(NCl)6 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na is bonded in an octahedral geometry to six Cl atoms. All Na–Cl bond lengths are 2.77 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are three shorter (2.12 Å) and one longer (2.13 Å) Hf–N bond lengths. All Hf–Cl bond lengths are 2.83 Å. In the second Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are three shorter (2.12 Å) and one longer (2.13 Å) Hf–N bond lengths. All Hf–Cl bond lengths are 2.84 Å. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form a mixture of corner and edge-sharing NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form a mixture of corner and edge-sharing NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms. In the second Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms.

36 MATERIALS SCIENCE↗