Search NASA⌕ Search

SEARCH · Search NASA

Results for “Br-O-Pr”

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.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on PrBrO by Materials Project

PrOBr crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three PrOBr sheets oriented in the (0, 0, 1) direction. Pr3+ is bonded in a 7-coordinate geometry to four equivalent O2- and three equivalent Br1- atoms. There are one shorter (2.40 Å) and three longer (2.43 Å) Pr–O bond lengths. All Pr–Br bond lengths are 3.07 Å. O2- is bonded to four equivalent Pr3+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. Br1- is bonded in a 3-coordinate geometry to three equivalent Pr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrBrO by Materials Project

PrOBr is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one PrOBr sheet oriented in the (0, 0, 1) direction. Pr3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four equivalent Br1- atoms. All Pr–O bond lengths are 2.37 Å. All Pr–Br bond lengths are 3.30 Å. O2- is bonded to four equivalent Pr3+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. Br1- is bonded in a 4-coordinate geometry to four equivalent Pr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrBrO2 by Materials Project

PrO2Br crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Pr is bonded in a 10-coordinate geometry to seven O and three equivalent Br atoms. There are a spread of Pr–O bond distances ranging from 2.42–2.76 Å. There are one shorter (3.06 Å) and two longer (3.22 Å) Pr–Br bond lengths. There are two inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to four equivalent Pr and one O atom. The O–O bond length is 1.50 Å. In the second O site, O is bonded to three equivalent Pr and one O atom to form a mixture of edge and corner-sharing OPr3O trigonal pyramids. Br is bonded in a distorted trigonal non-coplanar geometry to three equivalent Pr atoms.

36 MATERIALS SCIENCE↗