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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Re2O7 by Materials Project

Re2O7 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two Re2O7 sheets oriented in the (0, 1, 0) direction. Re7+ is bonded to six O2- atoms to form corner-sharing ReO6 octahedra. The corner-sharing octahedra tilt angles range from 13–25°. There are a spread of Re–O bond distances ranging from 1.74–1.97 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Re7+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent Re7+ atoms. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Re7+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Re2O7 by Materials Project

Re2O7 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is two-dimensional and consists of two Re2O7 sheets oriented in the (0, 0, 1) direction. there are four inequivalent Re7+ sites. In the first Re7+ site, Re7+ is bonded to six O2- atoms to form distorted ReO6 octahedra that share corners with two equivalent ReO6 octahedra and corners with two ReO4 tetrahedra. The corner-sharing octahedral tilt angles are 28°. There are a spread of Re–O bond distances ranging from 1.72–2.19 Å. In the second Re7+ site, Re7+ is bonded to four O2- atoms to form corner-sharing ReO4 tetrahedra. The corner-sharing octahedra tilt angles range from 28–33°. There are a spread of Re–O bond distances ranging from 1.72–1.80 Å. In the third Re7+ site, Re7+ is bonded to four O2- atoms to form corner-sharing ReO4 tetrahedra. The corner-sharing octahedra tilt angles range from 27–33°. There are a spread of Re–O bond distances ranging from 1.72–1.81 Å. In the fourth Re7+ site, Re7+ is bonded to six O2- atoms to form distorted ReO6 octahedra that share corners with two equivalent ReO6 octahedra and corners with two ReO4 tetrahedra. The corner-sharing octahedral tilt angles are 28°. There are a spread of Re–O bond distances ranging from 1.72–2.16 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Re7+ atoms. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the ninth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the tenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the twelfth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the thirteenth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the fourteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Re2O7 by Materials Project

Re2O7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Re7+ sites. In the first Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with six ReO6 octahedra and corners with five OO5 square pyramids. The corner-sharing octahedra tilt angles range from 25–52°. There are a spread of Re–O bond distances ranging from 1.82–2.03 Å. In the second Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with six ReO6 octahedra and corners with five OO5 square pyramids. The corner-sharing octahedra tilt angles range from 25–52°. There are a spread of Re–O bond distances ranging from 1.83–2.03 Å. In the third Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with six ReO6 octahedra and corners with five OO5 square pyramids. The corner-sharing octahedra tilt angles range from 25–52°. There are a spread of Re–O bond distances ranging from 1.83–2.02 Å. In the fourth Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with six ReO6 octahedra and corners with five OO5 square pyramids. The corner-sharing octahedra tilt angles range from 25–52°. There are a spread of Re–O bond distances ranging from 1.83–2.03 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded to five O2- atoms to form OO5 square pyramids that share corners with ten ReO6 octahedra. The corner-sharing octahedra tilt angles range from 64–75°. There are a spread of O–O bond distances ranging from 3.13–3.22 Å. In the second O2- site, O2- is bonded to five O2- atoms to form distorted OO5 square pyramids that share corners with ten ReO6 octahedra. The corner-sharing octahedra tilt angles range from 64–75°. There are a spread of O–O bond distances ranging from 3.15–3.23 Å. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two Re7+ and one O2- atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to two Re7+ and one O2- atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the seventh O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the ninth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the tenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the eleventh O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the twelfth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ atoms. In the thirteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom. In the fourteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Re7+ and one O2- atom.

36 MATERIALS SCIENCE↗
NASA NTRS1973

The problems of growth of single crystals of rhenium and iridium dioxides

Research is reported on the following: (1) growth of IrO2 and ReOx by the vapor phase method, in which a measured flow of oxygen gas carries the vapor products of the pure metals from a hot zone to a cold zone in a two temperature zone furnace; and (2) growth of IrO2 and Re2O7 single crystals by the chemical vapor transport method.

Source record↗