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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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12 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1985

Primary cosmic ray spectra in the range 20-60 GeV/n

Energy spectra for primary cosmic rays C-Fe above 20 GeV/n were measured on a balloon flight from Greenville S.C. in June 1982 with a hybrid electronic counter-emulsion chamber experiment. Fluxes above the atmosphere appear in general agreement with previously published values. The heavy events included in this data will be used along with the JACEE passive chamber data to provide a heavy composition direct measurement from 10 to the 12th power to approximately 10 to the 15th power eV total energy.

Burnett, T. H.↗
DOE OSTI2020

Materials Data on Fe4C by Materials Project

Fe4C is Iron carbide structured and crystallizes in the cubic P-43m space group. The structure is zero-dimensional and consists of one carbanide;iron molecule. Fe is bonded in a single-bond geometry to one C atom. The Fe–C bond length is 1.79 Å. C is bonded in a tetrahedral geometry to four equivalent Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe3C by Materials Project

Fe3C is Upper Bainite structured and crystallizes in the hexagonal P6_322 space group. The structure is three-dimensional. Fe is bonded in a bent 120 degrees geometry to two equivalent C atoms. Both Fe–C bond lengths are 1.92 Å. C is bonded to six equivalent Fe atoms to form corner-sharing CFe6 octahedra. The corner-sharing octahedral tilt angles are 52°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe7C3 by Materials Project

Fe7C3 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. there are three inequivalent Fe sites. In the first Fe site, Fe is bonded in a distorted L-shaped geometry to two equivalent C atoms. Both Fe–C bond lengths are 2.04 Å. In the second Fe site, Fe is bonded in a 3-coordinate geometry to three equivalent C atoms. There is one shorter (1.93 Å) and two longer (2.00 Å) Fe–C bond length. In the third Fe site, Fe is bonded in a 3-coordinate geometry to three equivalent C atoms. All Fe–C bond lengths are 1.98 Å. C is bonded in a 6-coordinate geometry to six Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2C by Materials Project

Fe2C is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Fe2+ is bonded in a distorted trigonal planar geometry to three equivalent C4- atoms. There is two shorter (1.92 Å) and one longer (1.94 Å) Fe–C bond length. C4- is bonded to six equivalent Fe2+ atoms to form a mixture of corner and edge-sharing CFe6 octahedra. The corner-sharing octahedral tilt angles are 51°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe7C3 by Materials Project

Fe7C3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are five inequivalent Fe sites. In the first Fe site, Fe is bonded in a 3-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.97–2.04 Å. In the second Fe site, Fe is bonded in a 3-coordinate geometry to three C atoms. There is one shorter (1.93 Å) and two longer (1.98 Å) Fe–C bond length. In the third Fe site, Fe is bonded in a water-like geometry to two equivalent C atoms. Both Fe–C bond lengths are 1.98 Å. In the fourth Fe site, Fe is bonded in a distorted trigonal planar geometry to three C atoms. There is one shorter (1.96 Å) and two longer (1.99 Å) Fe–C bond length. In the fifth Fe site, Fe is bonded in a 4-coordinate geometry to four C atoms. There are a spread of Fe–C bond distances ranging from 2.02–2.44 Å. There are two inequivalent C sites. In the first C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the second C site, C is bonded in a 6-coordinate geometry to eight Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe5C2 by Materials Project

Fe5C2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are ten inequivalent Fe sites. In the first Fe site, Fe is bonded in a distorted bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.00 Å) Fe–C bond length. In the second Fe site, Fe is bonded in a distorted bent 150 degrees geometry to two C atoms. There is one shorter (1.96 Å) and one longer (2.00 Å) Fe–C bond length. In the third Fe site, Fe is bonded in a bent 150 degrees geometry to two C atoms. There is one shorter (1.96 Å) and one longer (2.00 Å) Fe–C bond length. In the fourth Fe site, Fe is bonded in a bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe–C bond length. In the fifth Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.95–2.22 Å. In the sixth Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.94–2.23 Å. In the seventh Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.94–2.26 Å. In the eighth Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.94–2.27 Å. In the ninth Fe site, Fe is bonded to four C atoms to form distorted edge-sharing FeC4 tetrahedra. There are three shorter (2.02 Å) and one longer (2.03 Å) Fe–C bond lengths. In the tenth Fe site, Fe is bonded to four C atoms to form distorted edge-sharing FeC4 tetrahedra. There are three shorter (2.02 Å) and one longer (2.03 Å) Fe–C bond lengths. There are four inequivalent C sites. In the first C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the second C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the third C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the fourth C site, C is bonded in a 7-coordinate geometry to seven Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe3C by Materials Project

Fe3C is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two Fe3C sheets oriented in the (0, 0, 1) direction. there are two inequivalent Fe sites. In the first Fe site, Fe is bonded in a bent 150 degrees geometry to two equivalent C atoms. There is one shorter (1.96 Å) and one longer (1.99 Å) Fe–C bond length. In the second Fe site, Fe is bonded in a 2-coordinate geometry to two equivalent C atoms. Both Fe–C bond lengths are 2.00 Å. C is bonded in a 6-coordinate geometry to six Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2C by Materials Project

Fe2C crystallizes in the hexagonal P6/mmm space group. The structure is two-dimensional and consists of one Fe2C sheet oriented in the (0, 0, 1) direction. Fe2+ is bonded in a distorted trigonal planar geometry to three equivalent C4- atoms. All Fe–C bond lengths are 2.14 Å. C4- is bonded in a hexagonal planar geometry to six equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe3C by Materials Project

Fe3C is Upper Bainite-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Fe sites. In the first Fe site, Fe is bonded in a distorted bent 120 degrees geometry to two equivalent C atoms. There is one shorter (1.90 Å) and one longer (1.91 Å) Fe–C bond length. In the second Fe site, Fe is bonded in a distorted bent 120 degrees geometry to two equivalent C atoms. Both Fe–C bond lengths are 1.93 Å. C is bonded to six Fe atoms to form corner-sharing CFe6 octahedra. The corner-sharing octahedra tilt angles range from 48–51°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe5C2 by Materials Project

Fe5C2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are ten inequivalent Fe sites. In the first Fe site, Fe is bonded in a distorted bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe–C bond length. In the second Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are two shorter (1.96 Å) and one longer (2.25 Å) Fe–C bond lengths. In the third Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.95–2.29 Å. In the fourth Fe site, Fe is bonded in a bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe–C bond length. In the fifth Fe site, Fe is bonded in a bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe–C bond length. In the sixth Fe site, Fe is bonded to four C atoms to form distorted edge-sharing FeC4 tetrahedra. There are a spread of Fe–C bond distances ranging from 2.01–2.03 Å. In the seventh Fe site, Fe is bonded in a bent 150 degrees geometry to two C atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Fe–C bond length. In the eighth Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.95–2.25 Å. In the ninth Fe site, Fe is bonded in a 2-coordinate geometry to three C atoms. There are a spread of Fe–C bond distances ranging from 1.95–2.22 Å. In the tenth Fe site, Fe is bonded to four C atoms to form distorted edge-sharing FeC4 tetrahedra. There are a spread of Fe–C bond distances ranging from 2.01–2.05 Å. There are four inequivalent C sites. In the first C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the second C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the third C site, C is bonded in a 7-coordinate geometry to seven Fe atoms. In the fourth C site, C is bonded in a 6-coordinate geometry to seven Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe3C by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗