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Results for “I-Nb”

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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All sourcesNASA NTRSDOE OSTI
NASA NTRS1982

Irradiation effects in rapidly and conventionally solidified alloys. Phase stability in rapidly solidified N i-Nb under Ni ion irradiation

Two alloy compositions in the Ni-Nb system (Ni60Nb40 and Ni85Nb15) were produced by rapidly quenching from the melt with the piston anvil technique. The Ni60Nb40 was transformed to a metastable, partially crystalline state by heat treatment in a differential scanning calorimeter. The Ni85Nb15 was fully crystalline, with the majority of the grains composed of collections of primary dendrite arms. Both compositions were irradiated with 4 MeV Ni++ ions. The irradiation induced microstructures were examined by transmission electron microscopy and compared with thermally aged samples. The thermal evolution was arrested by ion irradiation in the temperature range studied, by inhibiting the nucleation of the NiNb phase. No irradiation induced voids were observed. It is found that the ion irradiation drives the microstructure along a different path than thermal evolution.

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DOE OSTI2020

Materials Data on Nb3I8 by Materials Project

Nb3I8 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of six Nb3I8 sheets oriented in the (0, 0, 1) direction. Nb+2.67+ is bonded to six I1- atoms to form distorted edge-sharing NbI6 octahedra. There are a spread of Nb–I bond distances ranging from 2.77–3.07 Å. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Nb+2.67+ atoms. In the second I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Nb+2.67+ atoms. In the third I1- site, I1- is bonded in a water-like geometry to two equivalent Nb+2.67+ atoms. In the fourth I1- site, I1- is bonded in a 12-coordinate geometry to three equivalent Nb+2.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbI4 by Materials Project

NbI4 crystallizes in the orthorhombic Cmc2_1 space group. The structure is one-dimensional and consists of four NbI4 ribbons oriented in the (1, 0, 0) direction. Nb4+ is bonded to six I1- atoms to form edge-sharing NbI6 octahedra. There are a spread of Nb–I bond distances ranging from 2.73–2.93 Å. There are six inequivalent I1- sites. In the first I1- site, I1- is bonded in a single-bond geometry to one Nb4+ atom. In the second I1- site, I1- is bonded in a water-like geometry to two equivalent Nb4+ atoms. In the third I1- site, I1- is bonded in a water-like geometry to two equivalent Nb4+ atoms. In the fourth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Nb4+ atoms. In the fifth I1- site, I1- is bonded in a single-bond geometry to one Nb4+ atom. In the sixth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Nb4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbI3 by Materials Project

NbI3 crystallizes in the hexagonal P6_3/mcm space group. The structure is one-dimensional and consists of one NbI3 ribbon oriented in the (0, 0, 1) direction. Nb3+ is bonded to six equivalent I1- atoms to form face-sharing NbI6 octahedra. All Nb–I bond lengths are 2.84 Å. I1- is bonded in a 2-coordinate geometry to two equivalent Nb3+ atoms.

36 MATERIALS SCIENCE↗