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 847 records · Page 47
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CsPr3CI6 by Materials Project

CsPr3CI6 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Cs1+ is bonded in a 11-coordinate geometry to eleven I1- atoms. There are a spread of Cs–I bond distances ranging from 4.00–4.51 Å. There are three inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded to two equivalent C4- and five I1- atoms to form distorted PrC2I5 pentagonal bipyramids that share a cornercorner with one PrCI5 octahedra, corners with two equivalent PrC2I5 pentagonal bipyramids, edges with two equivalent PrCI5 octahedra, edges with two equivalent PrC2I5 pentagonal bipyramids, and faces with two equivalent PrC2I5 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 11°. Both Pr–C bond lengths are 2.65 Å. There are a spread of Pr–I bond distances ranging from 3.18–3.52 Å. In the second Pr3+ site, Pr3+ is bonded to one C4- and five I1- atoms to form distorted PrCI5 octahedra that share a cornercorner with one PrC2I5 pentagonal bipyramid, an edgeedge with one PrCI5 octahedra, and edges with four PrC2I5 pentagonal bipyramids. The Pr–C bond length is 2.35 Å. There are a spread of Pr–I bond distances ranging from 3.18–3.47 Å. In the third Pr3+ site, Pr3+ is bonded to two equivalent C4- and five I1- atoms to form distorted PrC2I5 pentagonal bipyramids that share corners with two equivalent PrC2I5 pentagonal bipyramids, edges with two equivalent PrCI5 octahedra, edges with two equivalent PrC2I5 pentagonal bipyramids, and faces with two equivalent PrC2I5 pentagonal bipyramids. Both Pr–C bond lengths are 2.66 Å. There are a spread of Pr–I bond distances ranging from 3.21–3.47 Å. C4- is bonded in a 6-coordinate geometry to five Pr3+ and one C4- atom. The C–C bond length is 1.41 Å. There are six inequivalent I1- sites. In the first I1- site, I1- is bonded in a distorted see-saw-like geometry to one Cs1+ and three Pr3+ atoms. In the second I1- site, I1- is bonded in a 4-coordinate geometry to two equivalent Cs1+ and three Pr3+ atoms. In the third I1- site, I1- is bonded in a 5-coordinate geometry to two equivalent Cs1+ and three Pr3+ atoms. In the fourth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Cs1+ and two Pr3+ atoms. In the fifth I1- site, I1- is bonded in a 4-coordinate geometry to two equivalent Cs1+ and two Pr3+ atoms. In the sixth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Cs1+ and two Pr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Pa by Materials Project

PaPr3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pa is bonded to twelve equivalent Pr atoms to form PaPr12 cuboctahedra that share corners with six equivalent PaPr12 cuboctahedra, corners with twelve equivalent PrPr8Pa4 cuboctahedra, edges with eighteen equivalent PrPr8Pa4 cuboctahedra, faces with eight equivalent PaPr12 cuboctahedra, and faces with twelve equivalent PrPr8Pa4 cuboctahedra. There are six shorter (3.58 Å) and six longer (3.59 Å) Pa–Pr bond lengths. Pr is bonded to four equivalent Pa and eight equivalent Pr atoms to form distorted PrPr8Pa4 cuboctahedra that share corners with four equivalent PaPr12 cuboctahedra, corners with fourteen equivalent PrPr8Pa4 cuboctahedra, edges with six equivalent PaPr12 cuboctahedra, edges with twelve equivalent PrPr8Pa4 cuboctahedra, faces with four equivalent PaPr12 cuboctahedra, and faces with sixteen equivalent PrPr8Pa4 cuboctahedra. There are a spread of Pr–Pr bond distances ranging from 3.52–3.67 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr2Al3Ge4 by Materials Project

Pr2Al3Ge4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to two equivalent Al and eight Ge atoms. Both Pr–Al bond lengths are 3.27 Å. There are a spread of Pr–Ge bond distances ranging from 3.14–3.26 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Ge atoms to form distorted corner-sharing AlGe6 octahedra. The corner-sharing octahedral tilt angles are 33°. There are four shorter (2.63 Å) and two longer (2.83 Å) Al–Ge bond lengths. In the second Al site, Al is bonded in a 5-coordinate geometry to two equivalent Pr and five Ge atoms. There are a spread of Al–Ge bond distances ranging from 2.55–2.90 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 7-coordinate geometry to four equivalent Pr and three Al atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Pr and five Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrCu9Sn4 by Materials Project

PrCu9Sn4 is alpha-derived structured and crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to sixteen Cu and eight equivalent Sn atoms. There are eight shorter (3.56 Å) and eight longer (3.81 Å) Pr–Cu bond lengths. All Pr–Sn bond lengths are 3.54 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 1-coordinate geometry to two equivalent Pr, seven Cu, and four equivalent Sn atoms. There are a spread of Cu–Cu bond distances ranging from 2.42–3.18 Å. There are two shorter (2.83 Å) and two longer (2.86 Å) Cu–Sn bond lengths. In the second Cu site, Cu is bonded in a distorted cuboctahedral geometry to eight Cu and four equivalent Sn atoms. All Cu–Cu bond lengths are 2.50 Å. All Cu–Sn bond lengths are 2.62 Å. In the third Cu site, Cu is bonded in a 12-coordinate geometry to two equivalent Pr, eight Cu, and two equivalent Sn atoms. There are two shorter (2.52 Å) and one longer (2.72 Å) Cu–Cu bond lengths. Both Cu–Sn bond lengths are 2.70 Å. Sn is bonded in a 12-coordinate geometry to two equivalent Pr, seven Cu, and three equivalent Sn atoms. There are two shorter (2.87 Å) and one longer (3.05 Å) Sn–Sn bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrAlCu4 by Materials Project

PrCu4Al crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pr is bonded in a 6-coordinate geometry to fifteen Cu and three equivalent Al atoms. There are three shorter (3.08 Å) and twelve longer (3.35 Å) Pr–Cu bond lengths. All Pr–Al bond lengths are 3.08 Å. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded to three equivalent Pr, six equivalent Cu, and three equivalent Al atoms to form distorted CuPr3Al3Cu6 cuboctahedra that share corners with twelve equivalent CuPr4Al2Cu6 cuboctahedra, edges with six equivalent CuPr3Al3Cu6 cuboctahedra, and faces with twenty CuPr3Al3Cu6 cuboctahedra. All Cu–Cu bond lengths are 2.53 Å. All Cu–Al bond lengths are 3.08 Å. In the second Cu site, Cu is bonded to four equivalent Pr, six Cu, and two equivalent Al atoms to form distorted CuPr4Al2Cu6 cuboctahedra that share corners with twenty CuPr3Al3Cu6 cuboctahedra, edges with ten equivalent CuPr4Al2Cu6 cuboctahedra, and faces with sixteen CuPr3Al3Cu6 cuboctahedra. There are two shorter (2.66 Å) and two longer (2.69 Å) Cu–Cu bond lengths. Both Cu–Al bond lengths are 2.54 Å. Al is bonded in a 12-coordinate geometry to three equivalent Pr and nine Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrFeCo4 by Materials Project

PrFeCo4 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pr is bonded in a 6-coordinate geometry to three equivalent Fe and fifteen Co atoms. All Pr–Fe bond lengths are 2.93 Å. There are three shorter (2.93 Å) and twelve longer (3.21 Å) Pr–Co bond lengths. Fe is bonded to three equivalent Pr and nine Co atoms to form distorted FePr3Co9 cuboctahedra that share corners with twenty-one CoPr3Fe3Co6 cuboctahedra, edges with six equivalent FePr3Co9 cuboctahedra, faces with two equivalent FePr3Co9 cuboctahedra, and faces with twenty-one CoPr3Fe3Co6 cuboctahedra. There are six shorter (2.46 Å) and three longer (2.93 Å) Fe–Co bond lengths. There are two inequivalent Co sites. In the first Co site, Co is bonded to three equivalent Pr, three equivalent Fe, and six equivalent Co atoms to form distorted CoPr3Fe3Co6 cuboctahedra that share corners with nine equivalent FePr3Co9 cuboctahedra, corners with twelve equivalent CoPr4Fe2Co6 cuboctahedra, edges with six equivalent CoPr3Fe3Co6 cuboctahedra, faces with three equivalent FePr3Co9 cuboctahedra, and faces with twenty CoPr3Fe3Co6 cuboctahedra. All Co–Co bond lengths are 2.45 Å. In the second Co site, Co is bonded to four equivalent Pr, two equivalent Fe, and six Co atoms to form CoPr4Fe2Co6 cuboctahedra that share corners with four equivalent FePr3Co9 cuboctahedra, corners with twenty CoPr3Fe3Co6 cuboctahedra, edges with ten equivalent CoPr4Fe2Co6 cuboctahedra, faces with six equivalent FePr3Co9 cuboctahedra, and faces with sixteen CoPr3Fe3Co6 cuboctahedra. There are two shorter (2.51 Å) and two longer (2.56 Å) Co–Co bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrAlPd by Materials Project

PrPdAl crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Pr is bonded in a 5-coordinate geometry to five Pd and six equivalent Al atoms. There are four shorter (3.05 Å) and one longer (3.07 Å) Pr–Pd bond lengths. There are two shorter (3.33 Å) and four longer (3.40 Å) Pr–Al bond lengths. There are two inequivalent Pd sites. In the first Pd site, Pd is bonded in a 9-coordinate geometry to three equivalent Pr and six equivalent Al atoms. All Pd–Al bond lengths are 2.70 Å. In the second Pd site, Pd is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Al atoms. All Pd–Al bond lengths are 2.89 Å. Al is bonded in a 12-coordinate geometry to six equivalent Pr and four Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Np by Materials Project

NpPr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Np is bonded to twelve equivalent Pr atoms to form NpPr12 cuboctahedra that share corners with twelve equivalent NpPr12 cuboctahedra, edges with twenty-four equivalent PrPr8Np4 cuboctahedra, faces with six equivalent NpPr12 cuboctahedra, and faces with twelve equivalent PrPr8Np4 cuboctahedra. All Np–Pr bond lengths are 3.64 Å. Pr is bonded to four equivalent Np and eight equivalent Pr atoms to form PrPr8Np4 cuboctahedra that share corners with twelve equivalent PrPr8Np4 cuboctahedra, edges with eight equivalent NpPr12 cuboctahedra, edges with sixteen equivalent PrPr8Np4 cuboctahedra, faces with four equivalent NpPr12 cuboctahedra, and faces with fourteen equivalent PrPr8Np4 cuboctahedra. All Pr–Pr bond lengths are 3.64 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CePr3 by Materials Project

Pr3Ce is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded to eight equivalent Pr and four equivalent Ce atoms to form PrCe4Pr8 cuboctahedra that share corners with twelve equivalent PrCe4Pr8 cuboctahedra, edges with eight equivalent CePr12 cuboctahedra, edges with sixteen equivalent PrCe4Pr8 cuboctahedra, faces with four equivalent CePr12 cuboctahedra, and faces with fourteen equivalent PrCe4Pr8 cuboctahedra. All Pr–Pr bond lengths are 3.69 Å. All Pr–Ce bond lengths are 3.69 Å. Ce is bonded to twelve equivalent Pr atoms to form CePr12 cuboctahedra that share corners with twelve equivalent CePr12 cuboctahedra, edges with twenty-four equivalent PrCe4Pr8 cuboctahedra, faces with six equivalent CePr12 cuboctahedra, and faces with twelve equivalent PrCe4Pr8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrY by Materials Project

YPr crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pr is bonded to six equivalent Pr and six equivalent Y atoms to form PrPr6Y6 cuboctahedra that share corners with eighteen equivalent PrPr6Y6 cuboctahedra, edges with six equivalent PrPr6Y6 cuboctahedra, edges with twelve equivalent YPr6Y6 cuboctahedra, faces with eight equivalent PrPr6Y6 cuboctahedra, and faces with twelve equivalent YPr6Y6 cuboctahedra. All Pr–Pr bond lengths are 3.66 Å. All Pr–Y bond lengths are 3.65 Å. Y is bonded to six equivalent Pr and six equivalent Y atoms to form YPr6Y6 cuboctahedra that share corners with eighteen equivalent YPr6Y6 cuboctahedra, edges with six equivalent YPr6Y6 cuboctahedra, edges with twelve equivalent PrPr6Y6 cuboctahedra, faces with eight equivalent YPr6Y6 cuboctahedra, and faces with twelve equivalent PrPr6Y6 cuboctahedra. All Y–Y bond lengths are 3.66 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrHo by Materials Project

HoPr crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ho is bonded to six equivalent Ho and six equivalent Pr atoms to form HoPr6Ho6 cuboctahedra that share corners with eighteen equivalent HoPr6Ho6 cuboctahedra, edges with six equivalent HoPr6Ho6 cuboctahedra, edges with twelve equivalent PrPr6Ho6 cuboctahedra, faces with eight equivalent HoPr6Ho6 cuboctahedra, and faces with twelve equivalent PrPr6Ho6 cuboctahedra. All Ho–Ho bond lengths are 3.64 Å. All Ho–Pr bond lengths are 3.63 Å. Pr is bonded to six equivalent Ho and six equivalent Pr atoms to form PrPr6Ho6 cuboctahedra that share corners with eighteen equivalent PrPr6Ho6 cuboctahedra, edges with six equivalent PrPr6Ho6 cuboctahedra, edges with twelve equivalent HoPr6Ho6 cuboctahedra, faces with eight equivalent PrPr6Ho6 cuboctahedra, and faces with twelve equivalent HoPr6Ho6 cuboctahedra. All Pr–Pr bond lengths are 3.64 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrAl3Cu by Materials Project

PrCuAl3 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to four equivalent Cu and twelve Al atoms. All Pr–Cu bond lengths are 3.33 Å. There are four shorter (3.17 Å) and eight longer (3.42 Å) Pr–Al bond lengths. Cu is bonded in a 5-coordinate geometry to four equivalent Pr and five Al atoms. There are one shorter (2.42 Å) and four longer (2.47 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a distorted single-bond geometry to four equivalent Pr, one Cu, and four equivalent Al atoms. All Al–Al bond lengths are 2.72 Å. In the second Al site, Al is bonded in a distorted bent 120 degrees geometry to four equivalent Pr, two equivalent Cu, and two equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrAlCu by Materials Project

PrCuAl crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Pr is bonded in a 5-coordinate geometry to five Cu and six equivalent Al atoms. There are one shorter (2.96 Å) and four longer (3.03 Å) Pr–Cu bond lengths. There are two shorter (3.33 Å) and four longer (3.34 Å) Pr–Al bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a distorted q6 geometry to three equivalent Pr and six equivalent Al atoms. All Cu–Al bond lengths are 2.68 Å. In the second Cu site, Cu is bonded in a 9-coordinate geometry to six equivalent Pr and three equivalent Al atoms. All Cu–Al bond lengths are 2.84 Å. Al is bonded in a 12-coordinate geometry to six equivalent Pr, four Cu, and two equivalent Al atoms. Both Al–Al bond lengths are 2.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrAlNi4 by Materials Project

PrNi4Al crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Pr is bonded in a 6-coordinate geometry to fourteen Ni and four equivalent Al atoms. There are a spread of Pr–Ni bond distances ranging from 2.83–3.20 Å. All Pr–Al bond lengths are 3.26 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Pr, four equivalent Ni, and two equivalent Al atoms. All Ni–Ni bond lengths are 2.49 Å. Both Ni–Al bond lengths are 2.46 Å. In the second Ni site, Ni is bonded to four equivalent Pr, six Ni, and two equivalent Al atoms to form a mixture of distorted corner, edge, and face-sharing NiPr4Al2Ni6 cuboctahedra. Both Ni–Ni bond lengths are 2.56 Å. Both Ni–Al bond lengths are 2.48 Å. Al is bonded in a 12-coordinate geometry to four equivalent Pr and eight Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Sm by Materials Project

SmPr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sm is bonded to twelve equivalent Pr atoms to form SmPr12 cuboctahedra that share corners with twelve equivalent SmPr12 cuboctahedra, edges with twenty-four equivalent PrPr8Sm4 cuboctahedra, faces with six equivalent SmPr12 cuboctahedra, and faces with twelve equivalent PrPr8Sm4 cuboctahedra. All Sm–Pr bond lengths are 3.71 Å. Pr is bonded to four equivalent Sm and eight equivalent Pr atoms to form PrPr8Sm4 cuboctahedra that share corners with twelve equivalent PrPr8Sm4 cuboctahedra, edges with eight equivalent SmPr12 cuboctahedra, edges with sixteen equivalent PrPr8Sm4 cuboctahedra, faces with four equivalent SmPr12 cuboctahedra, and faces with fourteen equivalent PrPr8Sm4 cuboctahedra. All Pr–Pr bond lengths are 3.71 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Al by Materials Project

Pr3Al is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to eight equivalent Pr and four equivalent Al atoms. There are a spread of Pr–Pr bond distances ranging from 3.33–3.83 Å. There are two shorter (3.34 Å) and two longer (3.58 Å) Pr–Al bond lengths. Al is bonded to twelve equivalent Pr atoms to form a mixture of face and corner-sharing AlPr12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmPr by Materials Project

PmPr is Magnesium-derived structured and crystallizes in the trigonal P3m1 space group. The structure is three-dimensional. Pm is bonded to six equivalent Pm and six equivalent Pr atoms to form PmPm6Pr6 cuboctahedra that share corners with eighteen equivalent PmPm6Pr6 cuboctahedra, edges with six equivalent PmPm6Pr6 cuboctahedra, edges with twelve equivalent PrPm6Pr6 cuboctahedra, faces with eight equivalent PmPm6Pr6 cuboctahedra, and faces with twelve equivalent PrPm6Pr6 cuboctahedra. All Pm–Pm bond lengths are 3.70 Å. There are three shorter (3.70 Å) and three longer (3.71 Å) Pm–Pr bond lengths. Pr is bonded to six equivalent Pm and six equivalent Pr atoms to form PrPm6Pr6 cuboctahedra that share corners with eighteen equivalent PrPm6Pr6 cuboctahedra, edges with six equivalent PrPm6Pr6 cuboctahedra, edges with twelve equivalent PmPm6Pr6 cuboctahedra, faces with eight equivalent PrPm6Pr6 cuboctahedra, and faces with twelve equivalent PmPm6Pr6 cuboctahedra. All Pr–Pr bond lengths are 3.70 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Zn by Materials Project

Pr3Zn is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to eight equivalent Pr and four equivalent Zn atoms. There are a spread of Pr–Pr bond distances ranging from 3.35–3.78 Å. There are two shorter (3.32 Å) and two longer (3.57 Å) Pr–Zn bond lengths. Zn is bonded to twelve equivalent Pr atoms to form a mixture of face and corner-sharing ZnPr12 cuboctahedra.

36 MATERIALS SCIENCE↗