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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedra tilt angles range from 51–53°. There are a spread of Al–O bond distances ranging from 1.88–2.07 Å. H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.03 Å) and one longer (1.53 Å) H–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Al3+ and one H1+ atom to form distorted corner-sharing OAl3H trigonal pyramids. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the orthorhombic Cmc2_1 space group. The structure is two-dimensional and consists of two AlOOH sheets oriented in the (0, 1, 0) direction. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 21°. There are a spread of Al–O bond distances ranging from 1.90–1.97 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Al3+ atoms to form a mixture of edge and corner-sharing OAl4 trigonal pyramids. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one AlOOH sheet oriented in the (0, 0, 1) direction. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are a spread of Al–O bond distances ranging from 1.89–1.95 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Al3+ atoms to form a mixture of edge and corner-sharing OAl4 trigonal pyramids. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Al–O bond distances ranging from 1.73–2.25 Å. In the second Al3+ site, Al3+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 17°. There are a spread of Al–O bond distances ranging from 1.87–2.01 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.04 Å) and one longer (1.51 Å) H–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Al3+ and one H1+ atom. In the second O2- site, O2- is bonded to four Al3+ atoms to form corner-sharing OAl4 tetrahedra. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Al3+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Al3+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 56°. There are a spread of Al–O bond distances ranging from 1.87–1.99 Å. H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Al3+ and one H1+ atom to form corner-sharing OAl3H tetrahedra. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are a spread of Al–O bond distances ranging from 1.87–2.01 Å. H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.70 Å) H–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Al3+ and one H1+ atom. In the second O2- site, O2- is bonded to three equivalent Al3+ and one H1+ atom to form distorted corner-sharing OAl3H tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two AlOOH sheets oriented in the (0, 0, 1) direction. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are a spread of Al–O bond distances ranging from 1.89–1.96 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Al3+ atoms to form a mixture of edge and corner-sharing OAl4 trigonal pyramids. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHO2 by Materials Project

AlOOH crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. Al3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedra tilt angles range from 2–11°. There are a spread of Al–O bond distances ranging from 1.89–2.01 Å. H1+ is bonded in a distorted linear geometry to two equivalent O2- atoms. There is one shorter (1.02 Å) and one longer (1.57 Å) H–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to four equivalent Al3+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Al3+ and two equivalent H1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Al by Materials Project

AlHo2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 5-coordinate geometry to five equivalent Al atoms. There are a spread of Ho–Al bond distances ranging from 3.06–3.41 Å. In the second Ho site, Ho is bonded in a 3-coordinate geometry to five equivalent Al atoms. There are a spread of Ho–Al bond distances ranging from 3.14–3.54 Å. Al is bonded in a 10-coordinate geometry to ten Ho atoms.

36 MATERIALS SCIENCE↗