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 1,531 records · Page 85

Materials Data on Pr2S2F by Materials Project

Pr2S2F is alpha Niobium phosphide-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is zero-dimensional and consists of one Pr2S2F cluster. Pr is bonded in a linear geometry to one S and one F atom. The Pr–S bond length is 2.39 Å. The Pr–F bond length is 2.48 Å. S is bonded in a single-bond geometry to one Pr atom. F is bonded in a linear geometry to two equivalent Pr atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrGePd2 by Materials Project

PrPd2Ge is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Pr is bonded in a 11-coordinate geometry to ten equivalent Pd and three equivalent Ge atoms. There are a spread of Pr–Pd bond distances ranging from 3.09–3.72 Å. There are a spread of Pr–Ge bond distances ranging from 3.13–3.17 Å. Pd is bonded in a 12-coordinate geometry to five equivalent Pr, four equivalent Pd, and three equivalent Ge atoms. There are a spread of Pd–Pd bond distances ranging from 2.80–3.19 Å. There are a spread of Pd–Ge bond distances ranging from 2.57–2.73 Å. Ge is bonded in a 9-coordinate geometry to three equivalent Pr and six equivalent Pd atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrYCo4 by Materials Project

PrYCo4 is Hexagonal Laves-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to four equivalent Y and twelve equivalent Co atoms. All Pr–Y bond lengths are 3.15 Å. All Pr–Co bond lengths are 3.02 Å. Y is bonded in a 12-coordinate geometry to four equivalent Pr and twelve equivalent Co atoms. All Y–Co bond lengths are 3.01 Å. Co is bonded to three equivalent Pr, three equivalent Y, and six equivalent Co atoms to form a mixture of corner, edge, and face-sharing CoPr3Y3Co6 cuboctahedra. There are three shorter (2.56 Å) and three longer (2.58 Å) Co–Co bond lengths.

36 MATERIALS SCIENCE↗

Materials Data on Pr3Bi4Pt3 by Materials Project

Pr3Pt3Bi4 crystallizes in the cubic I-43d space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to four equivalent Pt and eight equivalent Bi atoms. All Pr–Pt bond lengths are 3.12 Å. There are four shorter (3.49 Å) and four longer (3.56 Å) Pr–Bi bond lengths. Pt is bonded in a 8-coordinate geometry to four equivalent Pr and four equivalent Bi atoms. All Pt–Bi bond lengths are 2.86 Å. Bi is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Pt atoms.

36 MATERIALS SCIENCE↗

Materials Data on KPr9(Si3O13)2 by Materials Project

Pr9K(SiO4)6O2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.65–3.02 Å. There are five inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.79 Å. In the second Pr3+ site, Pr3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.85 Å. In the third Pr3+ site, Pr3+ is bonded in a 6-coordinate geometry to nine O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.91 Å. In the fourth Pr3+ site, Pr3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.30–2.76 Å. In the fifth Pr3+ site, Pr3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.33–2.64 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.61 Å) and three longer (1.66 Å) Si–O bond length. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Pr3+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Pr3+ atoms. In the ninth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Pr3+ atoms. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Pr3+, and one Si4+ atom.

36 MATERIALS SCIENCE↗

Materials Data on PrAsPd by Materials Project

PrPdAs is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded to six equivalent Pd and six equivalent As atoms to form a mixture of edge and face-sharing PrAs6Pd6 cuboctahedra. All Pr–Pd bond lengths are 3.22 Å. All Pr–As bond lengths are 3.22 Å. Pd is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent As atoms. All Pd–As bond lengths are 2.54 Å. As is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Pd atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr2Br2O by Materials Project

Pr2OBr2 is Cyanogen Chloride-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is zero-dimensional and consists of one Pr2OBr2 cluster. Pr is bonded in a linear geometry to one O and one Br atom. The Pr–O bond length is 2.17 Å. The Pr–Br bond length is 2.74 Å. O is bonded in a linear geometry to two equivalent Pr atoms. Br is bonded in a single-bond geometry to one Pr atom.

36 MATERIALS SCIENCE↗

Materials Data on TbPrMn4 by Materials Project

TbPrMn4 is Hexagonal Laves-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Tb is bonded in a 12-coordinate geometry to four equivalent Pr and twelve equivalent Mn atoms. All Tb–Pr bond lengths are 3.20 Å. All Tb–Mn bond lengths are 3.06 Å. Pr is bonded in a 12-coordinate geometry to four equivalent Tb and twelve equivalent Mn atoms. All Pr–Mn bond lengths are 3.07 Å. Mn is bonded to three equivalent Tb, three equivalent Pr, and six equivalent Mn atoms to form a mixture of edge, face, and corner-sharing MnTb3Pr3Mn6 cuboctahedra. There are three shorter (2.59 Å) and three longer (2.65 Å) Mn–Mn bond lengths.

36 MATERIALS SCIENCE↗

Materials Data on PrSiIr by Materials Project

PrIrSi crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to four equivalent Ir and four equivalent Si atoms. There are three shorter (3.14 Å) and one longer (3.40 Å) Pr–Ir bond lengths. There are one shorter (3.17 Å) and three longer (3.24 Å) Pr–Si bond lengths. Ir is bonded in a 3-coordinate geometry to four equivalent Pr and three equivalent Si atoms. All Ir–Si bond lengths are 2.34 Å. Si is bonded in a 3-coordinate geometry to four equivalent Pr and three equivalent Ir atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrGaPd2 by Materials Project

PrPd2Ga crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Pr is bonded in a 11-coordinate geometry to ten equivalent Pd and three equivalent Ga atoms. There are a spread of Pr–Pd bond distances ranging from 3.10–3.73 Å. There are a spread of Pr–Ga bond distances ranging from 3.13–3.18 Å. Pd is bonded in a 12-coordinate geometry to five equivalent Pr, four equivalent Pd, and three equivalent Ga atoms. There are a spread of Pd–Pd bond distances ranging from 2.82–3.21 Å. There are a spread of Pd–Ga bond distances ranging from 2.59–2.69 Å. Ga is bonded in a 9-coordinate geometry to three equivalent Pr and six equivalent Pd atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrBiPd by Materials Project

PrPdBi is half-Heusler structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Pr is bonded to four equivalent Pd and six equivalent Bi atoms to form a mixture of distorted corner and face-sharing PrBi6Pd4 tetrahedra. All Pr–Pd bond lengths are 2.99 Å. All Pr–Bi bond lengths are 3.45 Å. Pd is bonded in a body-centered cubic geometry to four equivalent Pr and four equivalent Bi atoms. All Pd–Bi bond lengths are 2.99 Å. Bi is bonded in a 10-coordinate geometry to six equivalent Pr and four equivalent Pd atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrCdIn by Materials Project

PrCdIn crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to six equivalent Cd and six equivalent In atoms. There are three shorter (3.31 Å) and three longer (3.54 Å) Pr–Cd bond lengths. There are three shorter (3.31 Å) and three longer (3.77 Å) Pr–In bond lengths. Cd is bonded in a 10-coordinate geometry to six equivalent Pr, three equivalent Cd, and one In atom. All Cd–Cd bond lengths are 2.90 Å. The Cd–In bond length is 3.30 Å. In is bonded in a 10-coordinate geometry to six equivalent Pr, one Cd, and three equivalent In atoms. All In–In bond lengths are 2.98 Å.

36 MATERIALS SCIENCE↗

Materials Data on LaPrAl4 by Materials Project

PrLaAl4 is Hexagonal Laves-derived structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to four equivalent La and twelve equivalent Al atoms. All Pr–La bond lengths are 3.52 Å. All Pr–Al bond lengths are 3.37 Å. La is bonded in a 12-coordinate geometry to four equivalent Pr and twelve equivalent Al atoms. All La–Al bond lengths are 3.37 Å. Al is bonded to three equivalent Pr, three equivalent La, and six equivalent Al atoms to form a mixture of corner, edge, and face-sharing AlLa3Pr3Al6 cuboctahedra. All Al–Al bond lengths are 2.87 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr3IrI3 by Materials Project

Pr3IrI3 is Ilmenite-like structured and crystallizes in the cubic I4_132 space group. The structure is three-dimensional. Pr is bonded to two equivalent Ir and four equivalent I atoms to form a mixture of distorted edge and corner-sharing PrIr2I4 octahedra. The corner-sharing octahedra tilt angles range from 8–12°. Both Pr–Ir bond lengths are 2.90 Å. There are two shorter (3.30 Å) and two longer (3.45 Å) Pr–I bond lengths. Ir is bonded to six equivalent Pr atoms to form edge-sharing IrPr6 octahedra. I is bonded in a rectangular see-saw-like geometry to four equivalent Pr atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr6Mn23 by Materials Project

Pr6Mn23 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to twelve Mn atoms. There are a spread of Pr–Mn bond distances ranging from 2.98–3.14 Å. There are four inequivalent Mn sites. In the first Mn site, Mn is bonded to three equivalent Pr and nine Mn atoms to form MnPr3Mn9 cuboctahedra that share corners with twelve MnPr3Mn9 cuboctahedra and faces with twelve MnPr4Mn8 cuboctahedra. There are a spread of Mn–Mn bond distances ranging from 2.38–2.65 Å. In the second Mn site, Mn is bonded in a body-centered cubic geometry to eight equivalent Mn atoms. All Mn–Mn bond lengths are 2.54 Å. In the third Mn site, Mn is bonded to four equivalent Pr and eight Mn atoms to form a mixture of corner and face-sharing MnPr4Mn8 cuboctahedra. All Mn–Mn bond lengths are 2.68 Å. In the fourth Mn site, Mn is bonded in a 4-coordinate geometry to three equivalent Pr and ten Mn atoms. All Mn–Mn bond lengths are 2.93 Å.

36 MATERIALS SCIENCE↗

Materials Data on Pr2Se2F by Materials Project

Pr2Se2F is Cyanogen Chloride-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is zero-dimensional and consists of one Pr2Se2F cluster. Pr is bonded in a distorted linear geometry to one Se and one F atom. The Pr–Se bond length is 2.80 Å. The Pr–F bond length is 2.35 Å. Se is bonded in a single-bond geometry to one Pr atom. F is bonded in a linear geometry to two equivalent Pr atoms.

36 MATERIALS SCIENCE↗

Materials Data on Pr3Co4Sn13 by Materials Project

Pr3Co4Sn13 crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to four equivalent Co and twelve equivalent Sn atoms. All Pr–Co bond lengths are 3.42 Å. There are four shorter (3.35 Å) and eight longer (3.44 Å) Pr–Sn bond lengths. Co is bonded in a 6-coordinate geometry to three equivalent Pr and six equivalent Sn atoms. All Co–Sn bond lengths are 2.63 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to three equivalent Pr, two equivalent Co, and four Sn atoms. There are a spread of Sn–Sn bond distances ranging from 3.04–3.29 Å. In the second Sn site, Sn is bonded in a cuboctahedral geometry to twelve equivalent Sn atoms.

36 MATERIALS SCIENCE↗

Materials Data on PrGaPt by Materials Project

PrPtGa crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Pr is bonded in a 1-coordinate geometry to five equivalent Pt and six equivalent Ga atoms. There are a spread of Pr–Pt bond distances ranging from 2.98–3.23 Å. There are a spread of Pr–Ga bond distances ranging from 3.15–3.36 Å. Pt is bonded in a 9-coordinate geometry to five equivalent Pr and four equivalent Ga atoms. There are a spread of Pt–Ga bond distances ranging from 2.70–2.73 Å. Ga is bonded in a 10-coordinate geometry to six equivalent Pr and four equivalent Pt atoms.

36 MATERIALS SCIENCE↗