Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “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.

At least 199 records · Page 11

Materials Data on Pr(P3Ru)4 by Materials Project

PrRu4P12 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Pr3+ is bonded to twelve equivalent P1- atoms to form PrP12 cuboctahedra that share faces with eight equivalent RuP6 octahedra. All Pr–P bond lengths are 3.13 Å. Ru+2.25+ is bonded to six equivalent P1- atoms to form RuP6 octahedra that share corners with six equivalent RuP6 octahedra and faces with two equivalent PrP12 cuboctahedra. The corner-sharing octahedral tilt angles are 62°. All Ru–P bond lengths are 2.37 Å. P1- is bonded in a 5-coordinate geometry to one Pr3+, two equivalent Ru+2.25+, and two equivalent P1- atoms. There are one shorter (2.30 Å) and one longer (2.33 Å) P–P bond lengths.

36 MATERIALS SCIENCE↗

Materials Data on Pr(SiNi)2 by Materials Project

PrNi2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Pr–Si bond lengths are 3.14 Å. Ni+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing NiSi4 tetrahedra. All Ni–Si bond lengths are 2.34 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Ni+2.50+, and one Si4- atom. The Si–Si bond length is 2.52 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(SiRu)2 by Materials Project

PrRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Pr–Si bond lengths are 3.28 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.39 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Pr3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(CoP)2 by Materials Project

PrCo2P2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a body-centered cubic geometry to eight equivalent P3- atoms. All Pr–P bond lengths are 3.10 Å. Co+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing CoP4 tetrahedra. All Co–P bond lengths are 2.23 Å. P3- is bonded in a 4-coordinate geometry to four equivalent Pr3+ and four equivalent Co+1.50+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(CoSi)2 by Materials Project

PrCo2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a body-centered cubic geometry to eight equivalent Si4- atoms. All Pr–Si bond lengths are 3.11 Å. Co+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing CoSi4 tetrahedra. All Co–Si bond lengths are 2.29 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Co+2.50+, and one Si4- atom. The Si–Si bond length is 2.71 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(MnSi)2 by Materials Project

PrMn2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a body-centered cubic geometry to eight equivalent Si4- atoms. All Pr–Si bond lengths are 3.12 Å. Mn+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing MnSi4 tetrahedra. All Mn–Si bond lengths are 2.38 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Mn+2.50+, and one Si4- atom. The Si–Si bond length is 2.66 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(FeSi)2 by Materials Project

PrFe2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Pr–Si bond lengths are 3.17 Å. Fe+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing FeSi4 tetrahedra. All Fe–Si bond lengths are 2.28 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Fe+2.50+, and one Si4- atom. The Si–Si bond length is 2.79 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(NiSb)2 by Materials Project

PrNi2Sb2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Sb3- atoms. All Pr–Sb bond lengths are 3.43 Å. Ni+1.50+ is bonded to four equivalent Sb3- atoms to form a mixture of corner and edge-sharing NiSb4 tetrahedra. All Ni–Sb bond lengths are 2.50 Å. Sb3- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Ni+1.50+, and one Sb3- atom. The Sb–Sb bond length is 2.92 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(NiAs)2 by Materials Project

PrNi2As2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent As3- atoms. All Pr–As bond lengths are 3.21 Å. Ni+1.50+ is bonded to four equivalent As3- atoms to form a mixture of edge and corner-sharing NiAs4 tetrahedra. All Ni–As bond lengths are 2.37 Å. As3- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Ni+1.50+, and one As3- atom. The As–As bond length is 2.69 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(NiP)2 by Materials Project

PrNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Pr–P bond lengths are 3.07 Å. Ni+1.50+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.30 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Pr3+, four equivalent Ni+1.50+, and one P3- atom. The P–P bond length is 2.48 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(SiOs)2 by Materials Project

PrOs2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight equivalent Os+1.50- atoms. All Pr–Os bond lengths are 3.27 Å. Os+1.50- is bonded in a 4-coordinate geometry to four equivalent Pr3+ and four equivalent Si atoms. All Os–Si bond lengths are 2.41 Å. Si is bonded in a 5-coordinate geometry to four equivalent Os+1.50- and one Si atom. The Si–Si bond length is 2.66 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(CoB)4 by Materials Project

PrCo4B4 crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. Pr3+ is bonded in a 12-coordinate geometry to eight equivalent B3- atoms. All Pr–B bond lengths are 2.82 Å. Co+2.25+ is bonded in a 5-coordinate geometry to five equivalent B3- atoms. There are a spread of Co–B bond distances ranging from 1.99–2.48 Å. B3- is bonded in a 5-coordinate geometry to two equivalent Pr3+, five equivalent Co+2.25+, and one B3- atom. The B–B bond length is 1.79 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr(Mo3S4)2 by Materials Project

PrMo6S8 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Pr3+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are two shorter (2.83 Å) and six longer (3.06 Å) Pr–S bond lengths. Mo+2.17+ is bonded to five S2- atoms to form a mixture of corner and edge-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.41–2.60 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to one Pr3+ and three equivalent Mo+2.17+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to one Pr3+ and four equivalent Mo+2.17+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(NiAs)2 by Materials Project

PrNi2As2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight As3- atoms. All Pr–As bond lengths are 3.20 Å. There are two inequivalent Ni+1.50+ sites. In the first Ni+1.50+ site, Ni+1.50+ is bonded to four equivalent As3- atoms to form a mixture of edge and corner-sharing NiAs4 tetrahedra. All Ni–As bond lengths are 2.44 Å. In the second Ni+1.50+ site, Ni+1.50+ is bonded in a 5-coordinate geometry to five As3- atoms. There are one shorter (2.39 Å) and four longer (2.40 Å) Ni–As bond lengths. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded in a 4-coordinate geometry to four equivalent Pr3+ and four equivalent Ni+1.50+ atoms. In the second As3- site, As3- is bonded in a 9-coordinate geometry to four equivalent Pr3+ and five Ni+1.50+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(NiSb)2 by Materials Project

PrNi2Sb2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight Sb3- atoms. There are four shorter (3.37 Å) and four longer (3.45 Å) Pr–Sb bond lengths. There are two inequivalent Ni+1.50+ sites. In the first Ni+1.50+ site, Ni+1.50+ is bonded to four equivalent Sb3- atoms to form a mixture of corner and edge-sharing NiSb4 tetrahedra. All Ni–Sb bond lengths are 2.57 Å. In the second Ni+1.50+ site, Ni+1.50+ is bonded in a 5-coordinate geometry to five Sb3- atoms. There are one shorter (2.53 Å) and four longer (2.56 Å) Ni–Sb bond lengths. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 4-coordinate geometry to four equivalent Pr3+ and four equivalent Ni+1.50+ atoms. In the second Sb3- site, Sb3- is bonded in a 9-coordinate geometry to four equivalent Pr3+ and five Ni+1.50+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(Co2B)6 by Materials Project

PrCo12B6 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Pr3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Pr–B bond lengths are 3.06 Å. There are two inequivalent Co+1.25+ sites. In the first Co+1.25+ site, Co+1.25+ is bonded in a T-shaped geometry to three equivalent B3- atoms. All Co–B bond lengths are 2.10 Å. In the second Co+1.25+ site, Co+1.25+ is bonded to four equivalent B3- atoms to form a mixture of distorted edge and corner-sharing CoB4 trigonal pyramids. All Co–B bond lengths are 2.04 Å. B3- is bonded in a 7-coordinate geometry to one Pr3+ and seven Co+1.25+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr(BrO2)3 by Materials Project

PrO4Br3O2 crystallizes in the monoclinic P2/c space group. The structure is one-dimensional and consists of two hydrogen peroxide molecules and two PrO4Br3 ribbons oriented in the (1, 0, 0) direction. In each PrO4Br3 ribbon, Pr3+ is bonded in a tetrahedral geometry to four O2- atoms. There are two shorter (2.24 Å) and two longer (2.38 Å) Pr–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one Pr3+ and one Br3+ atom. The O–Br bond length is 1.83 Å. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pr3+ and one Br3+ atom. The O–Br bond length is 1.75 Å. There are two inequivalent Br3+ sites. In the first Br3+ site, Br3+ is bonded in a water-like geometry to two equivalent O2- atoms. In the second Br3+ site, Br3+ is bonded in a single-bond geometry to one O2- atom.

36 MATERIALS SCIENCE↗

Materials Data on Pr(BC)2 by Materials Project

PrB2C2 crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Pr4+ is bonded in a 8-coordinate geometry to eight equivalent C2- atoms. All Pr–C bond lengths are 2.83 Å. B is bonded in a 2-coordinate geometry to one B and two equivalent C2- atoms. The B–B bond length is 1.66 Å. Both B–C bond lengths are 1.62 Å. C2- is bonded in a 2-coordinate geometry to four equivalent Pr4+, two equivalent B, and one C2- atom. The C–C bond length is 1.43 Å.

36 MATERIALS SCIENCE↗